chore: add bdk team author and email to libraries

This is a big change that updates some of our build infrastructure
as well as upgrading the bdk dependency. It adds the simple
new_no_persist constructor on the wallet as well as the blocking
esplora client.

.editorconfig

@@ -1,29 +0,0 @@
-root = true
-
-[*]
-charset = utf-8
-end_of_line = lf
-indent_size = 2
-indent_style = space
-trim_trailing_whitespace = true
-insert_final_newline = true
-
-[*.md]
-trim_trailing_whitespace = false
-
-[*.rs]
-indent_size = 4
-
-[*.kt]
-indent_size = 4
-
-[*.gradle]
-indent_size = 4
-
-[tests/**/*.rs]
-charset = utf-8
-end_of_line = unset
-indent_size = unset
-indent_style = unset
-trim_trailing_whitespace = unset
-insert_final_newline = unset

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**  
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**  
+<!-- Steps or code to reproduce the behavior. -->
+
+**Expected behavior**  
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Build environment**  
+ - BDK tag/commit: <!-- e.g. v0.13.0, 3a07614 --> 
+ - OS+version: <!-- e.g. ubuntu 20.04.01, macOS 12.0.1, windows -->  
+ - Rust/Cargo version: <!-- e.g. 1.56.0 --> 
+ - Rust/Cargo target: <!-- e.g. x86_64-apple-darwin, x86_64-unknown-linux-gnu, etc. -->  
+
+**Additional context**  
+<!-- Add any other context about the problem here. --> 

.github/ISSUE_TEMPLATE/enhancement_request.md

@@ -0,0 +1,17 @@
+---
+name: Enhancement request
+about: Request a new feature or change to an existing feature
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Describe the enhancement**  
+<!-- A clear and concise description of what you would like added or changed. -->
+
+**Use case**  
+<!-- Tell us how you or others will use this new feature or change to an existing feature. --> 
+
+**Additional context**
+<!-- Add any other context about the enhancement here. --> 

.github/ISSUE_TEMPLATE/minor_release.md

@@ -0,0 +1,87 @@
+---
+name: Minor Release
+about: Create a new minor release [for release managers only]
+title: 'Release MAJOR.MINOR+1.0'
+labels: 'release'
+assignees: ''
+---
+
+## Create a new minor release
+## Bumping BDK Rust Version
+1. - [ ] Open a PR with an update to `Cargo.toml` to the new bdk release candidate and ensure all CI workflows run correctly. Fix errors if necessary.
+2. - [ ] Once the new bdk release is out, update the PR to replace the release candidate with the full release and merge.
+
+### Specific Libraries' Workflows
+#### _Android_
+3. - [ ] Update the API docs to reflect the changes in the API
+4. - [ ] Delete the `target` directory in bdk-ffi and all previous artifacts to make sure you're building the library from scratch.
+5. - [ ] Build the library and run the tests, and adjust if necessary.
+```shell
+# start an emulator prior to running the tests
+cd ./bdk-android/
+./gradlew buildAndroidLib
+./gradlew connectedAndroidTest
+```
+6. - [ ] Update the readme if necessary
+#### _JVM_
+7. - [ ] Update the API docs to reflect the changes in the API
+8. - [ ] Delete the `target` directory in bdk-ffi and all previous artifacts to make sure you're building the library from scratch
+9. - [ ] Build the library and run the tests, and adjust if necessary
+```shell
+cd ./bdk-jvm/
+./gradlew buildJvmLib
+./gradlew test
+```
+10. - [ ] Update the readme if necessary
+#### _Swift_
+11. - [ ] Run the tests and adjust if necessary
+```shell
+./bdk-swift/build-local-swift.sh
+cd ./bdk-swift/
+swift test
+```
+12. - [ ] Update the readme if necessary
+#### _Python_
+13. - [ ] Delete the `.tox`, `dist`, `build`, and `bdkpython.egg-info` and rust `target` directories to make sure you are building the library from scratch without any caches
+14. - [ ] Build the library
+```shell
+cd ./bdk-python/
+pip3 install --requirement requirements.txt
+bash ./scripts/generate-macos-arm64.sh # run the script for your particular platform
+python3 setup.py --verbose bdist_wheel
+```
+15. - [ ] Run the tests and adjust if necessary
+```shell
+pip3 install ./dist/bdkpython-<yourversion>-py3-none-any.whl --force-reinstall
+python -m unittest --verbose tests/test_bdk.py
+```
+16. - [ ] Update the readme and `setup.py` if necessary
+
+### Release Workflow
+17. - [ ] Update the Android, JVM, Python, and Swift libraries as per the _Specific Libraries' Workflows_ section above. Open a single PR on master for all of these changes called `Prepare language bindings libraries for 0.X release`. See [example PR here](https://github.com/bitcoindevkit/bdk-ffi/pull/315).
+18. - [ ] Create a new branch off of `master` called `release/version`
+19. - [ ] Update bdk-android version from `SNAPSHOT` version to release version
+20. - [ ] Update bdk-jvm version from `SNAPSHOT` version to release version
+21. - [ ] Update bdk-python version from `.dev` version to release version
+22. - [ ] Open a PR to that release branch that updates the Android, JVM, and Python libraries' versions in step 19, 20, and 21. See [example PR here](https://github.com/bitcoindevkit/bdk-ffi/pull/316).
+23. - [ ] Get a review and ACK and merge the PR updating all the languages to their release versions
+24. - [ ] Create the tag for the release and make sure to add the changelog info to the tag (works better if you prepare the tag message on the side in a text editor). Push the tag to GitHub.
+```shell
+git tag v0.6.0 --sign --edit
+git push upstream v0.6.0
+```
+25. - [ ] Trigger manual releases for all 4 libraries (for Swift, trigger the release on `master` and simply add the version number in the text field when running the workflow manually. Note that the version number must not contain the `v`, i.e. `0.26.0`)
+26. - [ ] Make sure the released libraries work and contain the artifacts you would expect 
+27. - [ ] Aggregate all the changelog notices from the PRs and add them to the changelog file
+28. - [ ] Bump the versions on master from `0.9.0-SNAPSHOT` to `0.10.0-SNAPSHOT`, `0.6.0.dev0` to `0.7.0.dev0`
+29. - [ ] Apply changes to the minor_release and patch_release issue templates if they need any
+30. - [ ] Open a PR on master with the changes in steps 29, 30, and 31. See [example PR here](https://github.com/bitcoindevkit/bdk-ffi/pull/317). Get a review and merge the PR.
+31. - [ ] Make release on GitHub (set as pre-release and generate auto release notes between the previous tag and the new one)
+32. - [ ] Build and publish API docs for JVM, Android, and Java on the website
+```shell
+./gradlew dokkaHtml    # bdk-jvm (Dokka)
+./gradlew dokkaJavadoc # bdk-jvm (java-style documentation)
+./gradlew dokkaHtml    # bdk-android (Dokka)
+```
+33. - [ ] Post in the announcement channel
+34. - [ ] Tweet about the library

.github/ISSUE_TEMPLATE/summer_project.md

@@ -0,0 +1,77 @@
+---
+name: Summer of Bitcoin Project
+about: Template to suggest a new https://www.summerofbitcoin.org/ project.
+title: ''
+labels: 'summer-of-bitcoin'
+assignees: ''
+
+---
+
+<!--
+## Overview  
+
+Project ideas are scoped for a university-level student with a basic background in CS and bitcoin 
+fundamentals - achievable over 12-weeks. Below are just a few types of ideas: 
+
+ - Low-hanging fruit: Relatively short projects with clear goals; requires basic technical knowledge 
+   and minimal familiarity with the codebase.
+ - Core development: These projects derive from the ongoing work from the core of your development 
+   team. The list of features and bugs is never-ending, and help is always welcome.
+ - Risky/Exploratory: These projects push the scope boundaries of your development effort. They 
+   might require expertise in an area not covered by your current development team. They might take 
+   advantage of a new technology. There is a reasonable chance that the project might be less 
+   successful, but the potential rewards make it worth the attempt.
+ - Infrastructure/Automation: These projects are the code that your organization uses to get its 
+   development work done; for example, projects that improve the automation of releases, regression 
+   tests and automated builds. This is a category where a Summer of Bitcoin student can be really 
+   helpful, doing work that the development team has been putting off while they focus on core 
+   development.
+ - Quality Assurance/Testing: Projects that work on and test your project's software development 
+   process. Additionally, projects that involve a thorough test and review of individual PRs.
+ - Fun/Peripheral: These projects might not be related to the current core development focus, but 
+   create new innovations and new perspectives for your project.
+-->
+
+**Description**
+<!-- Description: 3-7 sentences describing the project background and tasks to be done. -->  
+
+**Expected Outcomes**  
+<!-- Short bullet list describing what is to be accomplished -->   
+
+**Resources**  
+<!-- 2-3 reading materials for candidate to learn about the repo, project, scope etc -->  
+<!-- Recommended reading such as a developer/contributor guide -->  
+<!-- [Another example a paper citation](https://arxiv.org/pdf/1802.08091.pdf) -->  
+<!-- [Another example an existing issue](https://github.com/opencv/opencv/issues/11013) -->  
+<!-- [An existing related module](https://github.com/opencv/opencv_contrib/tree/master/modules/optflow) -->  
+
+**Skills Required**  
+<!-- 3-4 technical skills that the candidate should know -->  
+<!-- hands on experience with git -->  
+<!-- mastery plus experience coding in C++ -->  
+<!-- basic knowledge in matrix and tensor computations, college course work in cryptography -->  
+<!-- strong mathematical background -->
+<!-- Bonus - has experience with React Native. Best if you have also worked with OSSFuzz -->
+
+**Mentor(s)**  
+<!-- names of mentor(s) for this project go here -->
+
+**Difficulty**  
+<!-- Easy, Medium, Hard -->
+
+**Competency Test (optional)**  
+<!-- 2-3 technical tasks related to the project idea or repository you’d like a candidate to 
+    perform in order to demonstrate competency, good first bugs, warm-up exercises -->
+<!-- ex. Read the instructions here to get Bitcoin core running on your machine -->
+<!-- ex. pick an issue labeled as “newcomer” in the repository, and send a merge request to the 
+    repository. You can also suggest some other improvement that we did not think of yet, or 
+    something that you find interesting or useful -->
+<!-- ex. fixes for coding style are usually easy to do, and are good issues for first time 
+    contributions for those learning how to interact with the project. After you are done with the 
+    coding style issue, try making a different contribution. -->
+<!-- ex. setup a full Debian packaging development environment and learn the basics of Debian 
+    packaging. Then identify and package the missing dependencies to package Specter Desktop -->
+<!-- ex. write a pull parser for CSV files. You'll be judged by the decisions to store the parser 
+    state and how flexible it is to wrap this parser in other scenarios. -->
+<!-- ex. Stretch Goal: Implement some basic metaprogram/app to prove you're very familiar with BDK. 
+    Be prepared to make adjustments as we judge your solution. -->

.github/pull_request_template.md

@@ -0,0 +1,34 @@
+<!-- Erase any parts of this template not applicable to your Pull Request. -->
+
+### Description
+
+<!-- Describe the purpose of this PR, what's being adding and/or fixed -->
+
+### Notes to the reviewers
+
+<!-- In this section you can include notes directed to the reviewers, like explaining why some parts
+of the PR were done in a specific way -->
+
+### Changelog notice
+
+<!-- Notice the release manager should include in the release tag message changelog -->
+<!-- See https://keepachangelog.com/en/1.0.0/ for examples -->
+
+### Checklists
+
+#### All Submissions:
+
+* [ ] I've signed all my commits
+* [ ] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
+* [ ] I ran `cargo fmt` and `cargo clippy` before committing
+
+#### New Features:
+
+* [ ] I've added tests for the new feature
+* [ ] I've added docs for the new feature
+
+#### Bugfixes:
+
+* [ ] This pull request breaks the existing API
+* [ ] I've added tests to reproduce the issue which are now passing
+* [ ] I'm linking the issue being fixed by this PR

.github/workflows/audit.yml

@@ -0,0 +1,25 @@
+name: Audit
+
+on:
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+  schedule:
+    - cron: '0 0 * * 0' # Once per week
+
+jobs:
+  security_audit:
+    name: Security audit
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-ffi
+    steps:
+      - name: "Check out PR branch"
+        uses: actions/checkout@v3
+
+      - name: "Run audit"
+        run: |
+          cargo install cargo-audit
+          cargo-audit audit

.github/workflows/cont_integration.yml

@@ -0,0 +1,84 @@
+name: Rust layer CI
+on:
+  push:
+    paths:
+      - "bdk-ffi/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+
+jobs:
+  build-test:
+    name: "Build and test"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-ffi
+    strategy:
+      matrix:
+        rust:
+          - version: 1.73.0
+            clippy: true
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Generate cache key"
+        run: echo "${{ matrix.rust.version }} ${{ matrix.features }}" | tee .cache_key
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('.cache_key') }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set default toolchain"
+        run: rustup default ${{ matrix.rust.version }}
+
+      - name: "Set profile"
+        run: rustup set profile minimal
+
+      - name: "Add clippy"
+        if: ${{ matrix.rust.clippy }}
+        run: rustup component add clippy
+
+      - name: "Update toolchain"
+        run: rustup update
+
+      - name: "Build"
+        run: cargo build
+
+      - name: "Clippy"
+        if: ${{ matrix.rust.clippy }}
+        run: cargo clippy --all-targets --features "uniffi/bindgen-tests" -- -D warnings
+
+      - name: "Test"
+        run: CLASSPATH=./tests/jna/jna-5.8.0.jar cargo test --features uniffi/bindgen-tests
+
+  fmt:
+    name: "Rust fmt"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-ffi
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Set default toolchain"
+        run: rustup default nightly
+
+      - name: "Set profile"
+        run: rustup set profile minimal
+
+      - name: "Add rustfmt"
+        run: rustup component add rustfmt
+
+      - name: "Update toolchain"
+        run: rustup update
+
+      - name: "Check fmt"
+        run: cargo fmt --all -- --config format_code_in_doc_comments=true --check

.github/workflows/live-tests.yaml

@@ -0,0 +1,93 @@
+name: Run All Live Tests
+on: 
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 0' # Once per week
+
+jobs:
+  jvm-tests:
+    name: "Build and test JVM library on Linux"
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Checkout publishing branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Build bdk-jvm library"
+        run: |
+          cd bdk-jvm
+          ./gradlew buildJvmLib
+
+      - name: "Run live JVM tests"
+        run: |
+          cd bdk-jvm
+          ./gradlew test
+
+  swift-tests:
+    name: "Build and test iOS library on macOS"
+    runs-on: macos-12
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Build Swift package"
+        run: bash ./bdk-swift/build-local-swift.sh
+
+      - name: "Run live Swift tests"
+        working-directory: bdk-swift
+        run: swift test
+
+  python-tests:
+    name: "Build and test Python library on Linux"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-python
+    container:
+      image: quay.io/pypa/manylinux2014_x86_64
+      env:
+        PLAT: manylinux2014_x86_64
+        PYBIN: "/opt/python/${{ matrix.python }}/bin"
+    strategy:
+      matrix:
+        python:
+          - cp310-cp310
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-linux.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: ${PYBIN}/python setup.py bdist_wheel --plat-name manylinux_2_17_x86_64 --verbose
+
+      - name: "Install wheel"
+        run: ${PYBIN}/pip install ./dist/*.whl
+
+      - name: "Run live Python tests"
+        run: ${PYBIN}/python -m unittest --verbose

.github/workflows/publish-android.yaml

@@ -0,0 +1,48 @@
+name: Publish bdk-android to Maven Central
+on: [workflow_dispatch]
+
+# The default Android NDK on the ubuntu-22.04 image is 25.2.9519653
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Check out PR branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Install Rust Android targets"
+        run: rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi
+
+      - name: "Build bdk-android library"
+        run: |
+          cd bdk-android
+          ./gradlew buildAndroidLib
+
+      - name: "Publish to Maven Local and Maven Central"
+        env:
+          ORG_GRADLE_PROJECT_signingKeyId: ${{ secrets.PGP_KEY_ID }}
+          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.PGP_SECRET_KEY }}
+          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.PGP_PASSPHRASE }}
+          ORG_GRADLE_PROJECT_ossrhUsername: ${{ secrets.NEXUS_USERNAME }}
+          ORG_GRADLE_PROJECT_ossrhPassword: ${{ secrets.NEXUS_PASSWORD }}
+        run: |
+          cd bdk-android
+          ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository

.github/workflows/publish-jvm.yaml

@@ -0,0 +1,132 @@
+name: Publish bdk-jvm to Maven Central
+on: [workflow_dispatch]
+
+jobs:
+  build-macOS-native-libs:
+    name: "Create M1 and x86_64 native binaries"
+    runs-on: macos-12
+    steps:
+      - name: "Checkout publishing branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Install aarch64 Rust target"
+        run: rustup target add aarch64-apple-darwin
+
+      - name: "Build bdk-jvm library"
+        run: |
+          cd bdk-jvm
+          ./gradlew buildJvmLib
+
+      - name: "Upload macOS native libraries for reuse in publishing job"
+        uses: actions/upload-artifact@v3
+        with:
+          name: artifact-macos
+          path: /Users/runner/work/bdk-ffi/bdk-ffi/bdk-jvm/lib/src/main/resources/
+
+  build-windows-native-lib:
+    name: "Create Windows native binaries"
+    runs-on: windows-2022
+    steps:
+      - name: "Checkout publishing branch"
+        uses: actions/checkout@v3
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Install x86_64-pc-windows-msvc Rust target"
+        run: rustup target add x86_64-pc-windows-msvc
+
+      - name: "Build bdk-jvm library"
+        run: |
+          cd bdk-jvm
+          ./gradlew buildJvmLib
+
+      - name: "Upload Windows native libraries for reuse in publishing job"
+        uses: actions/upload-artifact@v3
+        with:
+          name: artifact-windows
+          path: D:\a\bdk-ffi\bdk-ffi\bdk-jvm\lib\src\main\resources\
+
+  build-full-library:
+    name: Create full bdk-jvm library
+    needs: [build-macOS-native-libs, build-windows-native-lib]
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Checkout publishing branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Build bdk-jvm library"
+        run: |
+          cd bdk-jvm
+          ./gradlew buildJvmLib
+
+      - name: "Download macOS native binaries from previous job"
+        uses: actions/download-artifact@v3
+        with:
+          name: artifact-macos
+          path: ./bdk-jvm/lib/src/main/resources/
+
+      - name: "Download Windows native libraries from previous job"
+        uses: actions/download-artifact@v3
+        with:
+          name: artifact-windows
+          path: ./bdk-jvm/lib/src/main/resources/
+
+      - name: "Upload library code and binaries"
+        uses: actions/upload-artifact@v3
+        with:
+          name: artifact-full
+          path: ./bdk-jvm/lib/
+
+      - name: "Publish to Maven Central"
+        env:
+          ORG_GRADLE_PROJECT_signingKeyId: ${{ secrets.PGP_KEY_ID }}
+          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.PGP_SECRET_KEY }}
+          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.PGP_PASSPHRASE }}
+          ORG_GRADLE_PROJECT_ossrhUsername: ${{ secrets.NEXUS_USERNAME }}
+          ORG_GRADLE_PROJECT_ossrhPassword: ${{ secrets.NEXUS_PASSWORD }}
+        run: |
+          cd bdk-jvm
+          ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository

.github/workflows/publish-python.yaml

@@ -0,0 +1,185 @@
+name: Publish bdkpython to PyPI
+on: [workflow_dispatch]
+
+# We use manylinux2014 because older CentOS versions used by 2010 and 1 have a very old glibc version, which
+# makes it very hard to use GitHub's javascript actions (checkout, upload-artifact, etc).
+# They mount their own nodejs interpreter inside your container, but since that's not statically linked it
+# tries to load glibc and fails because it requires a more recent version.
+
+jobs:
+  build-manylinux2014-x86_64-wheels:
+    name: "Build Manylinux 2014 x86_64 wheel"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-python
+    container:
+      image: quay.io/pypa/manylinux2014_x86_64
+      env:
+        PLAT: manylinux2014_x86_64
+        PYBIN: "/opt/python/${{ matrix.python }}/bin"
+    strategy:
+      matrix:
+        python: # Update this list whenever the docker image is updated (check /opt/python/)
+          - cp38-cp38
+          - cp39-cp39
+          - cp310-cp310
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      # TODO 2: Other CI workflows use explicit Rust compiler versions, I think we should do the same here
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-linux.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: ${PYBIN}/python setup.py bdist_wheel --plat-name manylinux_2_17_x86_64 --verbose
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-manylinux2014-x86_64-${{ matrix.python }}
+          path: /home/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-macos-arm64-wheels:
+    name: "Build macOS arm64 wheel"
+    runs-on: macos-13
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: "Install Python"
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-macos-arm64.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: python3 setup.py bdist_wheel --plat-name macosx_11_0_arm64 --verbose
+
+      - name: "Upload artifacts"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-macos-arm64-${{ matrix.python }}
+          path: /Users/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-macos-x86_64-wheels:
+    name: "Build macOS x86_64 wheel"
+    runs-on: macos-13
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: "Install Python"
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-macos-x86_64.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: python3 setup.py bdist_wheel --plat-name macosx_11_0_x86_64 --verbose
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-macos-x86_64-${{ matrix.python }}
+          path: /Users/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-windows-wheels:
+    name: "Build Windows wheel"
+    runs-on: windows-2022
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-windows.sh
+
+      - name: "Build wheel"
+        run: python setup.py bdist_wheel --verbose
+
+      - name: "Upload artifacts"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-win-${{ matrix.python }}
+          path: D:\a\bdk-ffi\bdk-ffi\bdk-python\dist\*.whl
+
+  publish-pypi:
+    name: "Publish on PyPI"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-python
+    needs: [build-manylinux2014-x86_64-wheels, build-macos-arm64-wheels, build-macos-x86_64-wheels, build-windows-wheels]
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Download artifacts in dist/ directory"
+        uses: actions/download-artifact@v3
+        with:
+          path: dist/
+
+      # - name: "Publish on test PyPI"
+      #   uses: pypa/gh-action-pypi-publish@release/v1
+      #   with:
+      #     user: __token__
+      #     password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+      #     repository_url: https://test.pypi.org/legacy/
+      #     packages_dir: dist/*/
+
+      - name: "Publish on PyPI"
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}
+          packages_dir: dist/*/

.github/workflows/test-android.yaml

@@ -0,0 +1,57 @@
+name: Test Android
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-android/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-android/**"
+
+# The default Android NDK on the ubuntu-22.04 image is 25.2.9519653
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Show default version of NDK"
+        run: echo $ANDROID_NDK_ROOT
+
+      - name: "Check out PR branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Install Rust Android targets"
+        run: rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi
+
+      - name: "Build Android library"
+        run: |
+          cd bdk-android
+          ./gradlew buildAndroidLib --console=plain
+
+# There are currently no unit tests for bdk-android (see the tests in bdk-jvm instead) and the 
+# integration tests require the macOS image which is not working with the older NDK version we
+# are using, so for now we just make sure that the library builds and omit the connectedTest
+#      - name: "Run Android connected tests"
+#        run: |
+#          cd bdk-android
+#          ./gradlew connectedAndroidTest --console=plain

.github/workflows/test-jvm.yaml

@@ -0,0 +1,41 @@
+name: Test Kotlin/JVM
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-jvm/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-jvm/**"
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Check out PR branch"
+        uses: actions/checkout@v3
+
+      - name: "Cache"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            ./target
+          key: ${{ runner.os }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+
+      - name: "Set up JDK"
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - name: "Set default Rust version to 1.73.0"
+        run: rustup default 1.73.0
+
+      - name: "Run JVM tests"
+        run: |
+          cd bdk-jvm
+          ./gradlew test -P excludeConnectedTests

.github/workflows/test-python.yaml

@@ -0,0 +1,189 @@
+name: Test Python
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-python/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-python/**"
+
+# We use manylinux2014 because older CentOS versions used by 2010 and 1 have a very old glibc version, which
+# makes it very hard to use GitHub's javascript actions (checkout, upload-artifact, etc).
+# They mount their own nodejs interpreter inside your container, but since that's not statically linked it
+# tries to load glibc and fails because it requires a more recent version.
+
+jobs:
+  build-manylinux2014-x86_64-wheels:
+    name: "Build and test Manylinux 2014 x86_64 wheels"
+    runs-on: ubuntu-20.04
+    defaults:
+      run:
+        working-directory: bdk-python
+    container:
+      image: quay.io/pypa/manylinux2014_x86_64
+      env:
+        PLAT: manylinux2014_x86_64
+        PYBIN: "/opt/python/${{ matrix.python }}/bin"
+    strategy:
+      matrix:
+        python:
+          - cp38-cp38
+          - cp39-cp39
+          - cp310-cp310
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-linux.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: ${PYBIN}/python setup.py bdist_wheel --plat-name manylinux_2_17_x86_64 --verbose
+
+      - name: "Install wheel"
+        run: ${PYBIN}/pip install ./dist/*.whl
+
+      - name: "Run tests"
+        run: ${PYBIN}/python -m unittest discover --start "./tests/" --pattern "test_offline_*.py" --verbose
+
+      - name: "Upload artifact test"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-manylinux2014-x86_64-${{ matrix.python }}
+          path: /home/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-macos-arm64-wheels:
+    name: "Build and test macOS arm64 wheels"
+    runs-on: macos-13
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: "Install Python"
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-macos-arm64.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: python3 setup.py bdist_wheel --plat-name macosx_11_0_arm64 --verbose
+
+      # You can't install the arm64 wheel on the CI, so we skip these steps and simply test that the wheel builds
+      # - name: "Install wheel and run tests"
+      #   run: |
+      #     pip3 install ./dist/*.whl
+      #     python3 -m unittest discover --start "./tests/" --pattern "test_offline_*.py" --verbose
+
+      - name: "Upload artifact test"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-macos-arm64-${{ matrix.python }}
+          path: /Users/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-macos-x86_64-wheels:
+    name: "Build and test macOS x86_64 wheels"
+    runs-on: macos-13
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-macos-x86_64.sh
+
+      - name: "Build wheel"
+        # Specifying the plat-name argument is necessary to build a wheel with the correct name,
+        # see issue #350 for more information
+        run: python3 setup.py bdist_wheel --plat-name macosx_11_0_x86_64 --verbose
+
+      - name: "Install wheel"
+        run: pip3 install ./dist/*.whl
+
+      - name: "Run tests"
+        run: python3 -m unittest discover --start "./tests/" --pattern "test_offline_*.py" --verbose
+
+      - name: "Upload artifact test"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-macos-x86_64-${{ matrix.python }}
+          path: /Users/runner/work/bdk-ffi/bdk-ffi/bdk-python/dist/*.whl
+
+  build-windows-wheels:
+    name: "Build and test Windows wheels"
+    runs-on: windows-2022
+    defaults:
+      run:
+        working-directory: bdk-python
+    strategy:
+      matrix:
+        python:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: "Install Python"
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: "Generate bdk.py and binaries"
+        run: bash ./scripts/generate-windows.sh
+
+      - name: "Build wheel"
+        run: python setup.py bdist_wheel --verbose
+
+      - name: "Upload artifact test"
+        uses: actions/upload-artifact@v3
+        with:
+          name: bdkpython-windows-${{ matrix.python }}
+          path: D:\a\bdk-ffi\bdk-ffi\bdk-python\dist\*.whl
+
+      - name: "Install dependencies"
+        run: Get-ChildItem 'D:\a\bdk-ffi\bdk-ffi\bdk-python\dist\*.whl' | ForEach-Object {pip install $_.FullName}
+        shell: powershell
+
+      - name: "Run tests"
+        run: python -m unittest discover --start "./tests/" --pattern "test_offline_*.py" --verbose

.github/workflows/test-swift.yaml

@@ -0,0 +1,26 @@
+name: Test Swift
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-swift/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-swift/**"
+
+jobs:
+  build:
+    name: "Build and test"
+    runs-on: macos-12
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Build Swift package"
+        run: bash ./bdk-swift/build-local-swift.sh
+
+      - name: "Run Swift tests"
+        working-directory: bdk-swift
+        run: swift test --skip LiveWalletTests --skip LiveTxBuilderTests

.gitignore

@@ -1,7 +1,5 @@
 target
 build
-Cargo.lock
-/bindings/bdk-kotlin/local.properties
 .gradle
 wallet_db
 bdk_ffi_test
@@ -14,3 +12,25 @@ testdb
 xcuserdata
 .lsp
 .clj-kondo
+.idea/
+.editorconfig
+bdk.kt
+
+# Swift related
+/.build
+.swiftpm
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+bdkFFI.xcframework.zip
+bdkFFI
+libbdkffi.a
+bdkFFI.h
+BitcoinDevKit.swift
+bdk.swift
+.build
+
+# Python related
+__pycache__

CHANGELOG.md

@@ -1,13 +1,220 @@
 # Changelog
-All notable changes to this project will be documented in this file.
+Changelog information can also be found in each release's git tag (which can be viewed with `git tag -ln100 "v*"`), as well as on the [GitHub releases](https://github.com/bitcoindevkit/bdk-ffi/releases) page. See [DEVELOPMENT_CYCLE.md](DEVELOPMENT_CYCLE.md) for more details.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.30.0]
+This release has a new API and a few internal optimizations and refactorings.
+
+- APIs Added
+  - Add BIP-86 descriptor templates [#388]
+
+[#388]: https://github.com/bitcoindevkit/bdk-ffi/pull/388
+
+## [0.29.0]
+This release has a number of new APIs, and adds support for Windows in bdk-jvm.
+
+Changelog
+- Add support for Windows in bdk-jvm [#336]
+- Add support for older version of Linux distros in bdk-jvm [#345]
+- APIs added
+  - Expose `is_mine()` method on the `Wallet` type [#355]
+  - Expose `to_bytes()` method on the `Script` type [#369]
+
+[#336]: https://github.com/bitcoindevkit/bdk-ffi/pull/336
+[#345]: https://github.com/bitcoindevkit/bdk-ffi/pull/345
+[#355]: https://github.com/bitcoindevkit/bdk-ffi/pull/355
+[#369]: https://github.com/bitcoindevkit/bdk-ffi/pull/369
+
+## [v0.28.0]
+- Update BDK to version 0.28.0 [#341]
+- Drop support of pypy releases of Python libraries [#351]
+- Drop support for Python 3.6 and 3.7 [#351]
+- Drop support for very old Linux versions that do not support the manylinux_2_17_x86_64 platform tag [#351]
+- APIs changed:
+  - Expose Address payload and network properties. [#325]
+  - Add SignOptions to Wallet.sign() params. [#326]
+  - address field on `AddressInfo` type is now of type `Address` [#333]
+  - new PartiallySignedTransaction.json_serialize() function to get JSON serialized value of all PSBT fields. [#334]
+  - Add from_script constructor to `Address` type [#337]
+
+[#325]: https://github.com/bitcoindevkit/bdk-ffi/pull/325
+[#326]: https://github.com/bitcoindevkit/bdk-ffi/pull/326
+[#333]: https://github.com/bitcoindevkit/bdk-ffi/pull/333
+[#334]: https://github.com/bitcoindevkit/bdk-ffi/pull/334
+[#337]: https://github.com/bitcoindevkit/bdk-ffi/pull/337
+[#341]: https://github.com/bitcoindevkit/bdk-ffi/pull/341
+[#351]: https://github.com/bitcoindevkit/bdk-ffi/pull/351
+
+## [v0.27.1]
+- Update BDK to version 0.27.1 [#312]
+- APIs changed
+  - `PartiallySignedTransaction.extract_tx()` returns a `Transaction` instead of the transaction bytes. [#296]
+  - `Blockchain.broadcast()` takes a `Transaction` instead of a `PartiallySignedTransaction`. [#296]
+- APIs added
+  - New `Transaction` structure that can be created from or serialized to consensus encoded bytes. [#296]
+  - Add Wallet.get_internal_address() API [#304]
+  - Add `AddressIndex::Peek(index)` and `AddressIndex::Reset(index)` APIs [#305]
+
+[#296]: https://github.com/bitcoindevkit/bdk-ffi/pull/296
+[#304]: https://github.com/bitcoindevkit/bdk-ffi/pull/304
+[#305]: https://github.com/bitcoindevkit/bdk-ffi/pull/305
+[#312]: https://github.com/bitcoindevkit/bdk-ffi/pull/312
+
+## [v0.26.0]
+- Update BDK to version 0.26.0 [#288]
+- APIs changed
+  - The descriptor and change_descriptor arguments on the wallet constructor now take a `Descriptor` instead of a `String`. [#260]
+  - TxBuilder.drain_to() argument is now `Script` instead of address `String`. [#279]
+- APIs added
+  - Added RpcConfig, BlockchainConfig::Rpc, and Auth [#125]
+  - Added Descriptor type in [#260] with the following methods:
+    - Default constructor requires a descriptor in String format and a Network
+    - new_bip44 constructor returns a Descriptor with structure pkh(key/44'/{0,1}'/0'/{0,1}/*)
+    - new_bip44_public constructor returns a Descriptor with structure pkh(key/{0,1}/*)
+    - new_bip49 constructor returns a Descriptor with structure sh(wpkh(key/49'/{0,1}'/0'/{0,1}/*))
+    - new_bip49_public constructor returns a Descriptor with structure sh(wpkh(key/{0,1}/*))
+    - new_bip84 constructor returns a Descriptor with structure wpkh(key/84'/{0,1}'/0'/{0,1}/*)
+    - new_bip84_public constructor returns a Descriptor with structure wpkh(key/{0,1}/*)
+    - as_string returns the public version of the output descriptor
+    - as_string_private returns the private version of the output descriptor if available, otherwise return the public version
+
+[#125]: https://github.com/bitcoindevkit/bdk-ffi/pull/125
+[#260]: https://github.com/bitcoindevkit/bdk-ffi/pull/260
+[#279]: https://github.com/bitcoindevkit/bdk-ffi/pull/279
+[#288]: https://github.com/bitcoindevkit/bdk-ffi/pull/288
+
+## [v0.25.0]
+- Update BDK to version 0.25.0 [#272]
+- APIs Added:
+  - from_string() constructors now available on DescriptorSecretKey and DescriptorPublicKey [#247]
+
+[#247]: https://github.com/bitcoindevkit/bdk-ffi/pull/247
+[#272]: https://github.com/bitcoindevkit/bdk-ffi/pull/272
+
+## [v0.11.0]
+- Update BDK to version 0.24.0 [#221]
+- APIs changed
+  - The constructor on the DescriptorSecretKey type now takes a Mnemonic instead of a String.
+- APIs added
+  - Added Mnemonic struct [#219] with following methods:
+    - new(word_count: WordCount) generates and returns Mnemonic with random entropy
+    - from_string(mnemonic: String) converts string Mnemonic to Mnemonic type with error
+    - from_entropy(entropy: Vec<u8>) generates and returns Mnemonic with given entropy
+    - as_string() view Mnemonic as string
+- APIs removed
+  - generate_mnemonic(word_count: WordCount)
+
+[#219]: https://github.com/bitcoindevkit/bdk-ffi/pull/219
+[#221]: https://github.com/bitcoindevkit/bdk-ffi/pull/221
+
+## [v0.10.0]
+- Update BDK to version 0.23.0 [#204]
+- Update uniffi-rs to latest version 0.21.0 [#216]
+- Breaking Changes
+  - Changed `TxBuilder.finish()` to return new `TxBuilderResult` [#209]
+  - `TxBuilder.add_recipient()` now takes a `Script` instead of an `Address` [#192]
+  - `AddressAmount` is now `ScriptAmount` [#192]
+- APIs Added
+  - Added `TxBuilderResult` with PSBT and TransactionDetails [#209]
+  - `Address` and `Script` structs have been added [#192]
+  - Add `PartiallySignedBitcoinTransaction.extract_tx()` function [#192]
+  - Add `secret_bytes()` method on the `DescriptorSecretKey` [#199]
+  - Add `PartiallySignedBitcoinTransaction.combine()` method [#200]
+
+[#192]: https://github.com/bitcoindevkit/bdk-ffi/pull/192
+[#199]: https://github.com/bitcoindevkit/bdk-ffi/pull/199
+[#200]: https://github.com/bitcoindevkit/bdk-ffi/pull/200
+[#204]: https://github.com/bitcoindevkit/bdk-ffi/pull/204
+[#209]: https://github.com/bitcoindevkit/bdk-ffi/pull/209
+[#216]: https://github.com/bitcoindevkit/bdk-ffi/pull/216
+
+## [v0.9.0]
+- Breaking Changes
+  - Rename `get_network()` method on `Wallet` interface to `network()` [#185]
+  - Rename `get_transactions()` method on `Wallet` interface to `list_transactions()` [#185]
+  - Remove `generate_extended_key`, returned ExtendedKeyInfo [#154]
+  - Remove `restore_extended_key`, returned ExtendedKeyInfo [#154]
+  - Remove dictionary `ExtendedKeyInfo {mnenonic, xprv, fingerprint}` [#154]
+  - Remove interface `Transaction` [#190]
+  - Changed `Wallet` interface `list_transaction()` to return array of `TransactionDetails` [#190]
+  - Update `bdk` dependency version to 0.22 [#193]
+- APIs Added [#154]
+  - `generate_mnemonic()`, returns string mnemonic
+  - `interface DescriptorSecretKey`
+    - `new(Network, string_mnenoinc, password)`, constructs DescriptorSecretKey
+    - `derive(DerivationPath)`, derives and returns child DescriptorSecretKey
+    - `extend(DerivationPath)`, extends and returns DescriptorSecretKey
+    - `as_public()`, returns DescriptorSecretKey as DescriptorPublicKey
+    - `as_string()`, returns DescriptorSecretKey as String
+  - `interface DescriptorPublicKey`
+    - `derive(DerivationPath)` derives and returns child DescriptorPublicKey
+    - `extend(DerivationPath)` extends and returns DescriptorPublicKey
+    - `as_string()` returns DescriptorPublicKey as String
+  - Add to `interface Blockchain` the `get_height()` and `get_block_hash()` methods [#184]
+  - Add to `interface TxBuilder`  the `set_recipients(recipient: Vec<AddressAmount>)` method [#186]
+  - Add to `dictionary TransactionDetails` the `confirmation_time` field [#190]
+- Interfaces Added [#154]
+  - `DescriptorSecretKey`
+  - `DescriptorPublicKey`
+  - `DerivationPath`
+
+[#154]: https://github.com/bitcoindevkit/bdk-ffi/pull/154
+[#184]: https://github.com/bitcoindevkit/bdk-ffi/pull/184
+[#185]: https://github.com/bitcoindevkit/bdk-ffi/pull/185
+[#193]: https://github.com/bitcoindevkit/bdk-ffi/pull/193
+
+## [v0.8.0]
+- Update BDK to version 0.20.0 [#169]
+- APIs Added
+  - `TxBuilder.add_data(data: Vec<u8>)` [#163]
+  - `Wallet.list_unspent()` returns `Vec<LocalUtxo>` [#158]
+  - Add coin control methods on TxBuilder [#164]
+
+[#163]: https://github.com/bitcoindevkit/bdk-ffi/pull/163
+[#158]: https://github.com/bitcoindevkit/bdk-ffi/pull/158
+[#164]: https://github.com/bitcoindevkit/bdk-ffi/pull/164
+[#169]: https://github.com/bitcoindevkit/bdk-ffi/pull/169
+[#190]: https://github.com/bitcoindevkit/bdk-ffi/pull/190
+
+## [v0.7.0]
+- Update BDK to version 0.19.0
+  - fixes sqlite-db issue causing wrong balance
+  - adds experimental taproot descriptor and PSBT support
+- APIs Removed 
+  - `Wallet.get_new_address()`, returned String, [#137] 
+  - `Wallet.get_last_unused_address()`, returned String [#137]
+- APIs Added
+  - `Wallet.get_address(AddressIndex)`, returns `AddressInfo` [#137]
+- APIs Changed
+  - `Wallet.sign(PartiallySignedBitcoinTransaction)` now returns a bool, true if finalized [#161]
+
+[#137]: https://github.com/bitcoindevkit/bdk-ffi/pull/137
+[#161]: https://github.com/bitcoindevkit/bdk-ffi/pull/161
+
+## [v0.6.0]
+- Update BDK to version 0.18.0
+- Add BumpFeeTxBuilder to bump the fee on an unconfirmed tx created by the Wallet
+- Change TxBuilder.build() to TxBuilder.finish() to align with bdk function name 
+
+## [v0.5.0]
+- Fix Wallet.broadcast function, now returns a tx id as a hex string
+- Remove creating a new spending Transaction via the PartiallySignedBitcoinTransaction constructor
+- Add TxBuilder for creating new spending PartiallySignedBitcoinTransaction
+- Add TxBuilder .add_recipient, .fee_rate, and .build functions
+- Add TxBuilder .drain_wallet and .drain_to functions
+- Update generate cli tool to generate all binding languages and rename to bdk-ffi-bindgen
+
+## [v0.4.0]
+- Add dual license MIT and Apache 2.0
+- Add sqlite database support
+- Fix memory database configuration enum, remove junk field
+
+## [v0.3.1]
+- Remove hard coded sync progress value (was always returning 21.0)
 
 ## [v0.3.0]
-
 - Move bdk-kotlin bindings and ios example to separate repos
 - Add bin to generate Python bindings
 - Add `PartiallySignedBitcoinTransaction::deserialize` function as named constructor to decode from a string per [BIP 0174]
@@ -16,8 +223,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [BIP 0174]:https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki#encoding
 
-## [v0.2.0]
-
-[v0.2.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.0.0...v0.2.0
+[v0.30.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.29.0...v0.30.0
+[v0.29.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.28.0...v0.29.0
+[v0.28.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.27.1...v0.28.0
+[v0.27.1]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.26.0...v0.27.1
+[v0.26.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.25.0...v0.26.0
+[v0.25.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.11.0...v0.25.0
+[v0.11.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.10.0...v0.11.0
+[v0.10.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.9.0...v0.10.0
+[v0.9.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.8.0...v0.9.0
+[v0.8.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.7.0...v0.8.0
+[v0.7.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.6.0...v0.7.0
+[v0.6.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.5.0...v0.6.0
+[v0.5.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.4.0...v0.5.0
+[v0.4.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.3.1...v0.4.0
+[v0.3.1]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.3.0...v0.3.1
 [v0.3.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.2.0...v0.3.0
-[unreleased]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.3.0...HEAD
+[v0.2.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.0.0...v0.2.0

Cargo.toml

@@ -1,28 +0,0 @@
-[package]
-name = "bdk-ffi"
-version = "0.3.1"
-authors = ["Steve Myers <steve@notmandatory.org>", "Sudarsan Balaji <sudarsan.balaji@artfuldev.com>"]
-edition = "2018"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-[lib]
-crate-type = ["staticlib", "cdylib"]
-name = "bdkffi"
-
-[dependencies]
-bdk = { version = "0.14", features = ["all-keys", "use-esplora-ureq"] }
-uniffi_macros = { version = "0.16.0", features = ["builtin-bindgen"] }
-uniffi = { version = "0.16.0", features = ["builtin-bindgen"] }
-thiserror = "1.0"
-anyhow = "=1.0.45" # remove after upgrading to next version of uniffi
-
-uniffi_bindgen = { version = "0.16.0", optional = true }
-
-[build-dependencies]
-uniffi_build = { version = "0.16.0", features = ["builtin-bindgen"] }
-
-[features]
-generate-python = ["uniffi_bindgen"]
-
-[[bin]]
-name = "generate"

DEVELOPMENT_CYCLE.md

@@ -0,0 +1,35 @@
+# Development Cycle
+
+This project follows a regular releasing schedule similar to the one [used by the Rust language] 
+except releases always follow the latest [`bdk`] release by one to two weeks.  In short, this means 
+that a new release is made at a regular cadence, with all the feature/bugfixes that made it to 
+`master` in time. This ensures that we don't keep delaying releases waiting for 
+"just one more little thing".
+
+After making a new `bdk-ffi` release tag all downstream language bindings should also be updated.
+
+This project uses [Semantic Versioning], but is currently at MAJOR version zero (0.y.z) meaning it 
+is still in initial development. Anything MAY change at any time. The public API SHOULD NOT be 
+considered stable. Until we reach version `1.0.0` we will do our best to document any breaking API 
+changes in the changelog info attached to each release tag.
+
+We decided to maintain a faster release cycle while the library is still in "beta", i.e. before 
+release `1.0.0`: since we are constantly adding new features and, even more importantly, fixing 
+issues, we want developers to have access to those updates as fast as possible. For this reason we 
+will make a release **every 4 weeks**.
+
+Once the project reaches a more mature state (>= `1.0.0`), we will very likely switch to longer 
+release cycles of **6 weeks**.
+
+The "feature freeze" will happen when [`bdk`] releases a release candidate. This project will then 
+be updated and tested with [`bdk`] release candidates until a final release is published. This 
+means a new branch will be created originating from the `master` tip at that time, and in that 
+branch we will stop adding new features and only focus on ensuring the ones we've added are working 
+properly.
+
+To create a new release a release manager will create a new issue using a `Release` template and 
+follow the template instructions.
+
+[used by the Rust language]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
+[Semantic Versioning]: https://semver.org/
+[`bdk`]: https://github.com/bitcoindevkit/bdk

LICENSE

@@ -0,0 +1,14 @@
+This software is licensed under [Apache 2.0](LICENSE-APACHE) or
+[MIT](LICENSE-MIT), at your option.
+
+Some files retain their own copyright notice, however, for full authorship
+information, see version control history.
+
+Except as otherwise noted in individual files, all files in this repository are
+licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+http://www.apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+http://opensource.org/licenses/MIT>, at your option.
+
+You may not use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of this software or any files in this repository except in
+accordance with one or both of these licenses.

LICENSE-APACHE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

LICENSE-MIT

@@ -0,0 +1,16 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

PGP-BDK-BINDINGS.asc

@@ -0,0 +1,14 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+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+=vvmK
+-----END PGP PUBLIC KEY BLOCK-----

README.md

@@ -1,67 +1,156 @@
 # Native language bindings for BDK
 
-This repository contains source code for generating native language bindings for the rust based 
-[bdk] library which is the central artifact of the [Bitcoin Dev Kit] project.
+<p>
+    <a href="https://github.com/bitcoindevkit/bdk-ffi/blob/master/LICENSE"><img alt="MIT or Apache-2.0 Licensed" src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg"/></a>
+    <a href="https://github.com/bitcoindevkit/bdk-ffi/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk-ffi/workflows/CI/badge.svg"></a>
+    <a href="https://blog.rust-lang.org/2022/05/19/Rust-1.61.0.html"><img alt="Rustc Version 1.61.0+" src="https://img.shields.io/badge/rustc-1.61.0%2B-lightgrey.svg"/></a>
+    <a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
+</p>
 
-Each supported language has it's own repository that includes this project as a [git submodule]. 
-The rust code in this project is a wrapper around the [bdk] library to expose it's APIs in a 
-uniform way using the [mozilla/uniffi-rs] bindings generator for each supported target language.
+## 🚨 Warning 🚨
+The `master` branch of this repository is being migrated to the [bdk 1.0 API](https://github.com/bitcoindevkit/bdk) and is incomplete. For production-ready libraries, use the [`0.30.X`](https://github.com/bitcoindevkit/bdk-ffi/tree/release/0.30) releases.
+
+## Readme
+The workspace in this repository creates the `libbdkffi` multi-language library for the Rust-based 
+[bdk] library from the [Bitcoin Dev Kit] project.
+
+Each supported language and the platform(s) it's packaged for has its own directory. The Rust code in this project is in the bdk-ffi directory and is a wrapper around the [bdk] library to expose its APIs in a uniform way using the [mozilla/uniffi-rs] bindings generator for each supported target language.
 
 ## Supported target languages and platforms
+The below directories (a separate repository in the case of bdk-swift) include instructions for using, building, and publishing the native language binding for [bdk] supported by this project.
 
-The below repositories include instructions for using, building, and publishing the native 
-language binding for [bdk] supported by this project.
+| Language | Platform              | Published Package             | Building Documentation | API Docs              |
+| -------- |-----------------------|-------------------------------|------------------------|-----------------------|
+| Kotlin   | JVM                   | [bdk-jvm (Maven Central)]     | [Readme bdk-jvm]       | [Kotlin JVM API Docs] |
+| Kotlin   | Android               | [bdk-android (Maven Central)] | [Readme bdk-android]   | [Android API Docs]    |
+| Swift    | iOS, macOS            | [bdk-swift (GitHub)]          | [Readme bdk-swift]     |                       |
+| Python   | linux, macOS, Windows | [bdk-python (PyPI)]           | [Readme bdk-python]    |                       |
 
-| Language | Platform     | Repository   |
-| -------- | ------------ | ------------ |
-| Kotlin   | jvm          | [bdk-kotlin] |
-| Kotlin   | android      | [bdk-kotlin] |
-| Swift    | iOS, macOS   | [bdk-swift]  |
-| Python   | linux, macOS | [bdk-python] |
+## Minimum Supported Rust Version (MSRV)
 
-[bdk]: https://github.com/bitcoindevkit/bdk
-[Bitcoin Dev Kit]: https://github.com/bitcoindevkit
-[git submodule]: https://git-scm.com/book/en/v2/Git-Tools-Submodules
-[uniffi-rs]: https://github.com/mozilla/uniffi-rs
-
-[bdk-kotlin]: https://github.com/bitcoindevkit/bdk-kotlin
-[bdk-swift]: https://github.com/bitcoindevkit/bdk-swift
-[bdk-python]: https://github.com/thunderbiscuit/bdk-python
+This library should compile with any combination of features with Rust 1.73.0.
 
 ## Contributing
 
-### Install uniffi-bindgen cli tool
-
-Install the uniffi-bindgen binary on your system using:
-
-`cargo install uniffi_bindgen`
-
-The version must be the same as the `uniffi` dependency in `Cargo.toml`.
-
 ### Adding new structs and functions
-
 See the [UniFFI User Guide](https://mozilla.github.io/uniffi-rs/)
 
 #### For pass by value objects
+1. Create new rust struct with only fields that are supported UniFFI types
+2. Update mapping `bdk.udl` file with new `dictionary`
 
-1. create new rust struct with only fields that are supported UniFFI types
-1. update mapping `bdk.udl` file with new `dictionary`
-
-#### For pass by reference values 
-
-1. create wrapper rust struct/impl with only fields that are `Sync + Send`
-1. update mapping `bdk.udl` file with new `interface`
+#### For pass by reference values
+1. Create wrapper rust struct/impl with only fields that are `Sync + Send`
+2. Update mapping `bdk.udl` file with new `interface`
 
 ## Goals
-
 1. Language bindings should feel idiomatic in target languages/platforms
-1. Adding new targets should be easy
-1. Getting up and running should be easy
-1. Contributing should be easy
-1. Get it right, then automate
+2. Adding new targets should be easy 
+3. Getting up and running should be easy 
+4. Contributing should be easy 
+5. Get it right, then automate
+
+## Using the libraries
+### bdk-android
+```kotlin
+// build.gradle.kts
+repositories {
+    mavenCentral()
+}
+dependencies { 
+    implementation("org.bitcoindevkit:bdk-android:<version>")
+}
+```
+
+### bdk-jvm
+```kotlin
+// build.gradle.kts
+repositories {
+    mavenCentral()
+}
+dependencies { 
+    implementation("org.bitcoindevkit:bdk-jvm:<version>")
+}
+```
+
+_Note:_ We also publish snapshot versions of bdk-jvm and bdk-android. See the specific readmes for instructions on how to use those.
+
+### bdk-python
+```shell
+pip3 install bdkpython
+```
+
+### bdk-swift
+Add bdk-swift to your dependencies in XCode.
+
+## Developing language bindings using uniffi-rs
+If you are interested in better understanding the base structure we use here in order to build your own Rust-to-Kotlin/Swift/Python language bindings, check out the [uniffi-bindings-template](https://github.com/thunderbiscuit/uniffi-bindings-template) repository. We maintain it as an example and starting point for other projects that wish to leverage the tech stack used in producing the BDK language bindings.
+
+## Verifying Signatures
+Both libraries and all their corresponding artifacts are signed with a PGP key you can find in the
+root of this repository. To verify the signatures follow the below steps:
+
+1. Import the PGP key in your keyring.
+```shell
+# Navigate to the root of the repository and import the ./PGP-BDK-BINDINGS.asc public key
+gpg --import ./PGP-BDK-BINDINGS.asc
+    
+# Alternatively, you can import the key directly from a public key server
+gpg --keyserver keyserver.ubuntu.com --receive-key 2768C43E8803C6A3
+    
+# Verify that the correct key was imported
+gpg --list-keys
+# You should see the below output
+pub   ed25519 2022-08-31 [SC]
+    88AD93AC4589FD090FF3B8D12768C43E8803C6A3
+uid           [ unknown] bitcoindevkit-bindings <bindings@bitcoindevkit.org>
+sub   cv25519 2022-08-31 [E]
+```
+
+2. Download the binary artifacts and corresponding signature files.
+- from [bdk-jvm]
+    - `bdk-jvm-<version>.jar`
+    - `bdk-jvm-<version>.jar.asc`
+- from [bdk-android]
+    - `bdk-android-<version>.aar`
+    - `bdk-android-<version>.aar.asc`
+
+3. Verify the signatures.
+```shell
+gpg --verify bdk-jvm-<version>.jar.asc 
+gpg --verify bdk-android-<version>.aar.asc
+
+# you should see a "Good signature" result
+gpg: Good signature from "bitcoindevkit-bindings <bindings@bitcoindevkit.org>" [unknown]
+```
+
+### PGP Metadata
+Full key ID: `88AD 93AC 4589 FD09 0FF3 B8D1 2768 C43E 8803 C6A3`  
+Fingerprint: `2768C43E8803C6A3`  
+Name: `bitcoindevkit-bindings`  
+Email: `bindings@bitcoindevkit.org`
 
 ## Thanks
-
 This project is made possible thanks to the wonderful work by the [mozilla/uniffi-rs] team.
 
+[Kotlin]: https://kotlinlang.org/
+[Android Studio]: https://developer.android.com/studio/
+[`bdk`]: https://github.com/bitcoindevkit/bdk
+[`bdk-ffi`]: https://github.com/bitcoindevkit/bdk-ffi
+["Getting Started (Developer)"]: https://github.com/bitcoindevkit/bdk-ffi#getting-started-developer
+[bdk-jvm]: https://search.maven.org/artifact/org.bitcoindevkit/bdk-jvm/0.11.0/jar
+[bdk-android]: https://search.maven.org/artifact/org.bitcoindevkit/bdk-android/0.11.0/aar
+[bdk-jvm (Maven Central)]: https://central.sonatype.dev/artifact/org.bitcoindevkit/bdk-jvm/0.11.0
+[bdk-android (Maven Central)]: https://central.sonatype.dev/artifact/org.bitcoindevkit/bdk-android/0.11.0
+[bdk-swift (GitHub)]: https://github.com/bitcoindevkit/bdk-swift
+[bdk-python (PyPI)]: https://pypi.org/project/bdkpython/
 [mozilla/uniffi-rs]: https://github.com/mozilla/uniffi-rs
+[bdk]: https://github.com/bitcoindevkit/bdk
+[Bitcoin Dev Kit]: https://github.com/bitcoindevkit
+[uniffi-rs]: https://github.com/mozilla/uniffi-rs
+[Readme bdk-jvm]: https://github.com/bitcoindevkit/bdk-ffi/tree/master/bdk-jvm
+[Readme bdk-android]: https://github.com/bitcoindevkit/bdk-ffi/tree/master/bdk-android
+[Readme bdk-swift]: https://github.com/bitcoindevkit/bdk-swift  
+[Readme bdk-python]: https://github.com/bitcoindevkit/bdk-ffi/tree/master/bdk-python
+[Kotlin JVM API Docs]: https://bitcoindevkit.org/jvm/
+[Android API Docs]: https://bitcoindevkit.org/android/

bdk-android/README.md

@@ -0,0 +1,121 @@
+# bdk-android
+This project builds an .aar package for the Android platform that provide Kotlin language bindings for the [`bdk`] library. The Kotlin language bindings are created by the [`bdk-ffi`] project which is included in the root of this repository.
+
+## How to Use
+To use the Kotlin language bindings for [`bdk`] in your Android project add the following to your gradle dependencies:
+```kotlin
+repositories {
+    mavenCentral()
+}
+
+dependencies { 
+    implementation("org.bitcoindevkit:bdk-android:<version>")
+}
+```
+
+You may then import and use the `org.bitcoindevkit` library in your Kotlin code like so. Note that this example is for the `0.30.0` release. For examples of the 1.0 API in the alpha releases, take a look at the tests [here](https://github.com/bitcoindevkit/bdk-ffi/tree/master/bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit).
+```kotlin
+import org.bitcoindevkit.*
+
+// ...
+
+val externalDescriptor = Descriptor("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)", Network.TESTNET)
+val internalDescriptor = Descriptor("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)", Network.TESTNET)
+
+val databaseConfig = DatabaseConfig.Memory
+
+val blockchainConfig = BlockchainConfig.Electrum(
+        ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5u, null, 10u, true)
+    )
+val wallet = Wallet(externalDescriptor, internalDescriptor, Network.TESTNET, databaseConfig, blockchainConfig)
+val newAddress = wallet.getAddress(AddressIndex.LastUnused)
+```
+
+### Snapshot releases
+To use a snapshot release, specify the snapshot repository url in the `repositories` block and use the snapshot version in the `dependencies` block:
+```kotlin
+repositories {
+    maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
+}
+
+dependencies { 
+    implementation("org.bitcoindevkit:bdk-android:<version-SNAPSHOT>")
+}
+```
+
+### Example Projects
+* [bdk-kotlin-example-wallet](https://github.com/bitcoindevkit/bdk-kotlin-example-wallet)
+* [Devkit Wallet](https://github.com/thunderbiscuit/devkit-wallet)
+* [Padawan Wallet](https://github.com/thunderbiscuit/padawan-wallet)
+
+### How to build
+_Note that Kotlin version `1.6.10` or later is required to build the library._
+
+1. Clone this repository.
+```shell
+git clone https://github.com/bitcoindevkit/bdk-ffi
+```
+2. Follow the "General" bdk-ffi ["Getting Started (Developer)"] instructions. 
+3. Install Rust (note that we are currently building using Rust 1.73.0):
+```shell
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup default 1.73.0
+```
+4. Install required targets
+```sh
+rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi
+```
+5. Install Android SDK and Build-Tools for API level 30+
+6. Setup `$ANDROID_SDK_ROOT` and `$ANDROID_NDK_ROOT` path variables (which are required by the
+   build tool), for example (note that currently, NDK version 25.2.9519653 or above is required):
+```shell
+export ANDROID_SDK_ROOT=~/Android/Sdk
+export ANDROID_NDK_ROOT=$ANDROID_SDK_ROOT/ndk/25.2.9519653
+```
+7. Build kotlin bindings
+ ```sh
+ # build Android library
+ cd bdk-android
+ ./gradlew buildAndroidLib
+ ```
+8. Start android emulator (must be x86_64) and run tests
+```sh
+./gradlew connectedAndroidTest
+```
+
+## How to publish to your local Maven repo
+```shell
+cd bdk-android
+./gradlew publishToMavenLocal --exclude-task signMavenPublication
+```
+
+Note that the commands assume you don't need the local libraries to be signed. If you do wish to sign them, simply set your `~/.gradle/gradle.properties` signing key values like so:
+```properties
+signing.gnupg.keyName=<YOUR_GNUPG_ID>
+signing.gnupg.passphrase=<YOUR_GNUPG_PASSPHRASE>
+```
+
+and use the `publishToMavenLocal` task without excluding the signing task:
+```shell
+./gradlew publishToMavenLocal
+```
+
+## Known issues
+### JNA dependency
+Depending on the JVM version you use, you might not have the JNA dependency on your classpath. The exception thrown will be
+```shell
+class file for com.sun.jna.Pointer not found
+```
+The solution is to add JNA as a dependency like so:
+```kotlin
+dependencies {
+    // ...
+    implementation("net.java.dev.jna:jna:5.12.1")
+}
+```
+
+### x86 emulators
+For some older versions of macOS, Android Studio will recommend users install the x86 version of the emulator by default. This will not work with the bdk-android library, as we do not support 32-bit architectures. Make sure you install an x86_64 emulator to work with bdk-android.
+
+[`bdk`]: https://github.com/bitcoindevkit/bdk
+[`bdk-ffi`]: https://github.com/bitcoindevkit/bdk-ffi

bdk-android/build.gradle.kts

@@ -0,0 +1,36 @@
+buildscript {
+    repositories {
+        google()
+    }
+    dependencies {
+        classpath("com.android.tools.build:gradle:7.1.2")
+    }
+}
+
+plugins {
+    id("io.github.gradle-nexus.publish-plugin") version "1.1.0"
+}
+
+// library version is defined in gradle.properties
+val libraryVersion: String by project
+
+// These properties are required here so that the nexus publish-plugin
+// finds a staging profile with the correct group (group is otherwise set as "")
+// and knows whether to publish to a SNAPSHOT repository or not
+// https://github.com/gradle-nexus/publish-plugin#applying-the-plugin
+group = "org.bitcoindevkit"
+version = libraryVersion
+
+nexusPublishing {
+    repositories {
+        create("sonatype") {
+            nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
+
+            val ossrhUsername: String? by project
+            val ossrhPassword: String? by project
+            username.set(ossrhUsername)
+            password.set(ossrhPassword)
+        }
+    }
+}

bdk-android/gradle.properties

@@ -0,0 +1,5 @@
+org.gradle.jvmargs=-Xmx1536m
+android.useAndroidX=true
+android.enableJetifier=true
+kotlin.code.style=official
+libraryVersion=1.0.0-alpha.2-rc1

bdk-android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

bdk-android/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

bdk-android/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

bdk-android/lib/build.gradle.kts

@@ -0,0 +1,113 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+// library version is defined in gradle.properties
+val libraryVersion: String by project
+
+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android") version "1.6.10"
+    id("maven-publish")
+    id("signing")
+
+    // Custom plugin to generate the native libs and bindings file
+    id("org.bitcoindevkit.plugins.generate-android-bindings")
+}
+
+repositories {
+    mavenCentral()
+    google()
+}
+
+android {
+    compileSdk = 31
+
+    defaultConfig {
+        minSdk = 21
+        targetSdk = 31
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = false
+            proguardFiles(file("proguard-android-optimize.txt"), file("proguard-rules.pro"))
+        }
+    }
+
+    publishing {
+        singleVariant("release") {
+            withSourcesJar()
+            withJavadocJar()
+        }
+    }
+}
+
+dependencies {
+    implementation("net.java.dev.jna:jna:5.8.0@aar")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7")
+    implementation("androidx.appcompat:appcompat:1.4.0")
+    implementation("androidx.core:core-ktx:1.7.0")
+    api("org.slf4j:slf4j-api:1.7.30")
+
+    androidTestImplementation("com.github.tony19:logback-android:2.0.0")
+    androidTestImplementation("androidx.test.ext:junit:1.1.3")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.4.0")
+    androidTestImplementation("org.jetbrains.kotlin:kotlin-test:1.6.10")
+    androidTestImplementation("org.jetbrains.kotlin:kotlin-test-junit:1.6.10")
+}
+
+afterEvaluate {
+    publishing {
+        publications {
+            create<MavenPublication>("maven") {
+                groupId = "org.bitcoindevkit"
+                artifactId = "bdk-android"
+                version = libraryVersion
+
+                from(components["release"])
+                pom {
+                    name.set("bdk-android")
+                    description.set("Bitcoin Dev Kit Kotlin language bindings.")
+                    url.set("https://bitcoindevkit.org")
+                    licenses {
+                        license {
+                            name.set("APACHE 2.0")
+                            url.set("https://github.com/bitcoindevkit/bdk/blob/master/LICENSE-APACHE")
+                        }
+                        license {
+                            name.set("MIT")
+                            url.set("https://github.com/bitcoindevkit/bdk/blob/master/LICENSE-MIT")
+                        }
+                    }
+                    developers {
+                        developer {
+                            id.set("bdkdevelopers")
+                            name.set("Bitcoin Dev Kit Developers")
+                            email.set("dev@bitcoindevkit.org")
+                        }
+                    }
+                    scm {
+                        connection.set("scm:git:github.com/bitcoindevkit/bdk-ffi.git")
+                        developerConnection.set("scm:git:ssh://github.com/bitcoindevkit/bdk-ffi.git")
+                        url.set("https://github.com/bitcoindevkit/bdk-ffi/tree/master")
+                    }
+                }
+            }
+        }
+    }
+}
+
+signing {
+    val signingKeyId: String? by project
+    val signingKey: String? by project
+    val signingPassword: String? by project
+    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
+    sign(publishing.publications)
+}
+
+// This task dependency ensures that we build the bindings
+// binaries before running the tests
+tasks.withType<KotlinCompile> {
+    dependsOn("buildAndroidLib")
+}

bdk-android/lib/proguard-rules.pro

@@ -0,0 +1,28 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
+
+# for JNA
+-dontwarn java.awt.*
+-keep class com.sun.jna.* { *; }
+-keep class org.bitcoindevkit.* { *; }
+-keepclassmembers class * extends org.bitcoindevkit.* { public *; }
+-keepclassmembers class * extends com.sun.jna.* { public *; }

bdk-android/lib/src/androidTest/assets/logback.xml

@@ -0,0 +1,14 @@
+<configuration>
+  <appender name="logcat" class="ch.qos.logback.classic.android.LogcatAppender">
+    <tagEncoder>
+      <pattern>%logger{12}</pattern>
+    </tagEncoder>
+    <encoder>
+      <pattern>[%-20thread] %msg</pattern>
+    </encoder>
+  </appender>
+
+  <root level="DEBUG">
+    <appender-ref ref="logcat" />
+  </root>
+</configuration>

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/LiveTxBuilderTest.kt

@@ -0,0 +1,30 @@
+package org.bitcoindevkit
+
+import org.junit.Test
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.runner.RunWith
+import kotlin.test.assertTrue
+
+@RunWith(AndroidJUnit4::class)
+class LiveTxBuilderTest {
+    @Test
+    fun testTxBuilder() {
+        val descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient = EsploraClient("https://mempool.space/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+
+        assert(wallet.getBalance().total() > 0uL)
+
+        val recipient: Address = Address("tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", Network.TESTNET)
+        val psbt: PartiallySignedTransaction = TxBuilder()
+            .addRecipient(recipient.scriptPubkey(), 4200uL)
+            .feeRate(2.0f)
+            .finish(wallet)
+
+        println(psbt.serialize())
+        assertTrue(psbt.serialize().startsWith("cHNi"), "PSBT should start with 'cHNi'")
+    }
+}

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/LiveWalletTest.kt

@@ -0,0 +1,58 @@
+package org.bitcoindevkit
+
+import org.junit.Test
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.runner.RunWith
+import kotlin.test.assertTrue
+
+@RunWith(AndroidJUnit4::class)
+class LiveWalletTest {
+    @Test
+    fun testSyncedBalance() {
+        val descriptor: Descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet: Wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient: EsploraClient = EsploraClient("https://mempool.space/testnet/api")
+        // val esploraClient = EsploraClient("https://blockstream.info/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+        val balance: Balance = wallet.getBalance()
+        println("Balance: $balance")
+
+        assert(wallet.getBalance().total() > 0uL)
+    }
+
+    @Test
+    fun testBroadcastTransaction() {
+        val descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient = EsploraClient("https://mempool.space/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+        println("New address: ${wallet.getAddress(AddressIndex.New).address}")
+
+        assert(wallet.getBalance().total() > 0uL) {
+            "Wallet balance must be greater than 0! Please send funds to ${wallet.getAddress(AddressIndex.New).address} and try again."
+        }
+
+        val recipient: Address = Address("tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", Network.TESTNET)
+
+        val psbt: PartiallySignedTransaction = TxBuilder()
+            .addRecipient(recipient.scriptPubkey(), 4200uL)
+            .feeRate(4.0f)
+            .finish(wallet)
+
+        println(psbt.serialize())
+        assertTrue(psbt.serialize().startsWith("cHNi"), "PSBT should start with 'cHNi'")
+
+        val walletDidSign = wallet.sign(psbt)
+        assertTrue(walletDidSign)
+
+        val tx: Transaction = psbt.extractTx()
+
+        println("Txid is: ${tx.txid()}")
+        esploraClient.broadcast(tx)
+    }
+}

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/OfflineDescriptorTest.kt

@@ -0,0 +1,22 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.runner.RunWith
+import kotlin.test.assertEquals
+
+@RunWith(AndroidJUnit4::class)
+class OfflineDescriptorTest {
+    @Test
+    fun testDescriptorBip86() {
+        val mnemonic: Mnemonic = Mnemonic.fromString("space echo position wrist orient erupt relief museum myself grain wisdom tumble")
+        val descriptorSecretKey: DescriptorSecretKey = DescriptorSecretKey(Network.TESTNET, mnemonic, null)
+        val descriptor: Descriptor = Descriptor.newBip86(descriptorSecretKey, KeychainKind.EXTERNAL, Network.TESTNET)
+
+        assertEquals(
+            expected = "tr([be1eec8f/86'/1'/0']tpubDCTtszwSxPx3tATqDrsSyqScPNnUChwQAVAkanuDUCJQESGBbkt68nXXKRDifYSDbeMa2Xg2euKbXaU3YphvGWftDE7ozRKPriT6vAo3xsc/0/*)#m7puekcx",
+            actual = descriptor.asString()
+        )
+    }
+}

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/OfflineWalletTest.kt

@@ -0,0 +1,56 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class OfflineWalletTest {
+    @Test
+    fun testDescriptorBip86() {
+        val mnemonic: Mnemonic = Mnemonic(WordCount.WORDS12)
+        val descriptorSecretKey: DescriptorSecretKey = DescriptorSecretKey(Network.TESTNET, mnemonic, null)
+        val descriptor: Descriptor = Descriptor.newBip86(descriptorSecretKey, KeychainKind.EXTERNAL, Network.TESTNET)
+
+        assertTrue(descriptor.asString().startsWith("tr"), "Bip86 Descriptor does not start with 'tr'")
+    }
+
+   @Test
+    fun testNewAddress() {
+        val descriptor: Descriptor = Descriptor(
+            "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
+            Network.TESTNET
+        )
+        val wallet: Wallet = Wallet.newNoPersist(
+            descriptor,
+            null,
+            Network.TESTNET
+        )
+        val addressInfo: AddressInfo = wallet.getAddress(AddressIndex.New)
+
+        assertEquals(
+            expected = "tb1qzg4mckdh50nwdm9hkzq06528rsu73hjxxzem3e",
+            actual = addressInfo.address.asString()
+        )
+    }
+
+    @Test
+    fun testBalance() {
+        val descriptor: Descriptor = Descriptor(
+            "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
+            Network.TESTNET
+        )
+        val wallet: Wallet = Wallet.newNoPersist(
+            descriptor,
+            null,
+            Network.TESTNET
+        )
+
+        assertEquals(
+            expected = 0uL,
+            actual = wallet.getBalance().total()
+        )
+    }
+}

bdk-android/lib/src/main/AndroidManifest.xml

@@ -0,0 +1,6 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="org.bitcoindevkit">
+
+  <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>

bdk-android/plugins/README.md

@@ -0,0 +1,17 @@
+# Readme
+The purpose of this directory is to host the Gradle plugin that adds tasks for building the native binaries required by `bdk-android`, and building the language bindings files.
+
+The plugin is applied to the `build.gradle.kts` file in `bdk-android` through the `plugins` block:
+```kotlin
+// bdk-android
+plugins {
+    id("org.bitcoindevkit.plugins.generate-android-bindings")
+}
+```
+
+It adds a series of tasks which are brought together into an aggregate task called `buildAndroidLib`. 
+
+This aggregate task:
+1. Builds the native libraries using `bdk-ffi`
+2. Places them in the correct resource directories
+3. Builds the bindings file

bdk-android/plugins/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    id("java-gradle-plugin")
+    `kotlin-dsl`
+}
+
+gradlePlugin {
+    plugins {
+        create("uniFfiAndroidBindings") {
+            id = "org.bitcoindevkit.plugins.generate-android-bindings"
+            implementationClass = "org.bitcoindevkit.plugins.UniFfiAndroidPlugin"
+        }
+    }
+}

bdk-android/plugins/settings.gradle.kts

@@ -0,0 +1,8 @@
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+        google()
+    }
+}
+
+// include(":plugins")

bdk-android/plugins/src/main/kotlin/org/bitcoindevkit/plugins/Enums.kt

@@ -0,0 +1,14 @@
+package org.bitcoindevkit.plugins
+
+
+val operatingSystem: OS = when {
+    System.getProperty("os.name").contains("mac", ignoreCase = true) -> OS.MAC
+    System.getProperty("os.name").contains("linux", ignoreCase = true) -> OS.LINUX
+    else -> OS.OTHER
+}
+
+enum class OS {
+    MAC,
+    LINUX,
+    OTHER,
+}

bdk-android/plugins/src/main/kotlin/org/bitcoindevkit/plugins/UniFfiAndroidPlugin.kt

@@ -0,0 +1,172 @@
+package org.bitcoindevkit.plugins
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.tasks.Copy
+import org.gradle.api.tasks.Exec
+import org.gradle.kotlin.dsl.environment
+import org.gradle.kotlin.dsl.getValue
+import org.gradle.kotlin.dsl.provideDelegate
+import org.gradle.kotlin.dsl.register
+
+internal class UniFfiAndroidPlugin : Plugin<Project> {
+    override fun apply(target: Project): Unit = target.run {
+        val llvmArchPath = when (operatingSystem) {
+            OS.MAC -> "darwin-x86_64"
+            OS.LINUX -> "linux-x86_64"
+            OS.OTHER -> throw Error("Cannot build Android library from current architecture")
+        }
+
+        // arm64-v8a is the most popular hardware architecture for Android
+        val buildAndroidAarch64Binary by tasks.register<Exec>("buildAndroidAarch64Binary") {
+
+            workingDir("${projectDir}/../../bdk-ffi")
+            val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "aarch64-linux-android")
+
+            executable("cargo")
+            args(cargoArgs)
+
+            // if ANDROID_NDK_ROOT is not set then set it to github actions default
+            if (System.getenv("ANDROID_NDK_ROOT") == null) {
+                environment(
+                    Pair("ANDROID_NDK_ROOT", "${System.getenv("ANDROID_SDK_ROOT")}/ndk-bundle")
+                )
+            }
+
+            environment(
+                // add build toolchain to PATH
+                Pair("PATH", "${System.getenv("PATH")}:${System.getenv("ANDROID_NDK_ROOT")}/toolchains/llvm/prebuilt/$llvmArchPath/bin"),
+                Pair("CFLAGS", "-D__ANDROID_MIN_SDK_VERSION__=21"),
+                Pair("AR", "llvm-ar"),
+                Pair("CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER", "aarch64-linux-android21-clang"),
+                Pair("CC", "aarch64-linux-android21-clang")
+            )
+
+            doLast {
+                println("Native library for bdk-android on aarch64 built successfully")
+            }
+        }
+
+        // the x86_64 version of the library is mostly used by emulators
+        val buildAndroidX86_64Binary by tasks.register<Exec>("buildAndroidX86_64Binary") {
+
+            workingDir("${project.projectDir}/../../bdk-ffi")
+            val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "x86_64-linux-android")
+
+            executable("cargo")
+            args(cargoArgs)
+
+            // if ANDROID_NDK_ROOT is not set then set it to github actions default
+            if (System.getenv("ANDROID_NDK_ROOT") == null) {
+                environment(
+                    Pair("ANDROID_NDK_ROOT", "${System.getenv("ANDROID_SDK_ROOT")}/ndk-bundle")
+                )
+            }
+
+            environment(
+                // add build toolchain to PATH
+                Pair("PATH", "${System.getenv("PATH")}:${System.getenv("ANDROID_NDK_ROOT")}/toolchains/llvm/prebuilt/$llvmArchPath/bin"),
+                Pair("CFLAGS", "-D__ANDROID_MIN_SDK_VERSION__=21"),
+                Pair("AR", "llvm-ar"),
+                Pair("CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER", "x86_64-linux-android21-clang"),
+                Pair("CC", "x86_64-linux-android21-clang")
+            )
+
+            doLast {
+                println("Native library for bdk-android on x86_64 built successfully")
+            }
+        }
+
+        // armeabi-v7a version of the library for older 32-bit Android hardware
+        val buildAndroidArmv7Binary by tasks.register<Exec>("buildAndroidArmv7Binary") {
+
+            workingDir("${project.projectDir}/../../bdk-ffi")
+            val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "armv7-linux-androideabi")
+
+            executable("cargo")
+            args(cargoArgs)
+
+            // if ANDROID_NDK_ROOT is not set then set it to github actions default
+            if (System.getenv("ANDROID_NDK_ROOT") == null) {
+                environment(
+                    Pair("ANDROID_NDK_ROOT", "${System.getenv("ANDROID_SDK_ROOT")}/ndk-bundle")
+                )
+            }
+
+            environment(
+                // add build toolchain to PATH
+                Pair("PATH", "${System.getenv("PATH")}:${System.getenv("ANDROID_NDK_ROOT")}/toolchains/llvm/prebuilt/$llvmArchPath/bin"),
+                Pair("CFLAGS", "-D__ANDROID_MIN_SDK_VERSION__=21"),
+                Pair("AR", "llvm-ar"),
+                Pair("CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER", "armv7a-linux-androideabi21-clang"),
+                Pair("CC", "armv7a-linux-androideabi21-clang")
+            )
+
+            doLast {
+                println("Native library for bdk-android on armv7 built successfully")
+            }
+        }
+
+        // move the native libs build by cargo from target/<architecture>/release/
+        // to their place in the bdk-android library
+        // the task only copies the available binaries built using the buildAndroid<architecture>Binary tasks
+        val moveNativeAndroidLibs by tasks.register<Copy>("moveNativeAndroidLibs") {
+
+            dependsOn(buildAndroidAarch64Binary)
+
+            into("${project.projectDir}/../lib/src/main/jniLibs/")
+
+            into("arm64-v8a") {
+                from("${project.projectDir}/../../bdk-ffi/target/aarch64-linux-android/release-smaller/libbdkffi.so")
+            }
+
+            into("x86_64") {
+                from("${project.projectDir}/../../bdk-ffi/target/x86_64-linux-android/release-smaller/libbdkffi.so")
+            }
+
+            into("armeabi-v7a") {
+                from("${project.projectDir}/../../bdk-ffi/target/armv7-linux-androideabi/release-smaller/libbdkffi.so")
+            }
+
+            doLast {
+                println("Native binaries for Android moved to ./lib/src/main/jniLibs/")
+            }
+        }
+
+        // generate the bindings using the bdk-ffi-bindgen tool located in the bdk-ffi submodule
+        val generateAndroidBindings by tasks.register<Exec>("generateAndroidBindings") {
+            dependsOn(moveNativeAndroidLibs)
+
+            // val libraryPath = "${project.projectDir}/../../bdk-ffi/target/aarch64-linux-android/release-smaller/libbdkffi.so"
+            // workingDir("${project.projectDir}/../../bdk-ffi")
+            // val cargoArgs: List<String> = listOf("run", "--bin", "uniffi-bindgen", "generate", "--library", libraryPath, "--language", "kotlin", "--out-dir", "../bdk-android/lib/src/main/kotlin", "--no-format")
+
+            // The code above worked for uniffi 0.24.3 using the --library flag
+            // The code below works for uniffi 0.23.0
+            workingDir("${project.projectDir}/../../bdk-ffi")
+            val cargoArgs: List<String> = listOf("run", "--bin", "uniffi-bindgen", "generate", "src/bdk.udl", "--language", "kotlin", "--out-dir", "../bdk-android/lib/src/main/kotlin", "--no-format")
+
+            executable("cargo")
+            args(cargoArgs)
+
+            doLast {
+                println("Android bindings file successfully created")
+            }
+        }
+
+        // create an aggregate task which will run the required tasks to build the Android libs in order
+        // the task will also appear in the printout of the ./gradlew tasks task with group and description
+        tasks.register("buildAndroidLib") {
+            group = "Bitcoindevkit"
+            description = "Aggregate task to build Android library"
+
+            dependsOn(
+                buildAndroidAarch64Binary,
+                buildAndroidX86_64Binary,
+                buildAndroidArmv7Binary,
+                moveNativeAndroidLibs,
+                generateAndroidBindings
+            )
+        }
+    }
+}

bdk-android/settings.gradle.kts

@@ -0,0 +1,4 @@
+rootProject.name = "bdk-android"
+
+include(":lib")
+includeBuild("plugins")

bdk-ffi/Cargo.toml

@@ -0,0 +1,47 @@
+[package]
+name = "bdk-ffi"
+version = "1.0.0-alpha.2"
+homepage = "https://bitcoindevkit.org"
+repository = "https://github.com/bitcoindevkit/bdk"
+edition = "2018"
+license = "MIT OR Apache-2.0"
+
+[lib]
+crate-type = ["lib", "staticlib", "cdylib"]
+name = "bdkffi"
+
+[[bin]]
+name = "uniffi-bindgen"
+path = "uniffi-bindgen.rs"
+
+[features]
+default = ["uniffi/cli"]
+
+[dependencies]
+bdk = { version = "1.0.0-alpha.2", features = ["all-keys", "keys-bip39"] }
+
+# TODO 22: The bdk_esplora crate uses esplora_client which uses reqwest for async. By default it uses the system
+#          openssl library, which is creating problems for cross-compilation. I'd rather use rustls, but it's hidden
+#          behind a feature flag. We need to look into whether openssl-sys is really required by bdk or if using rustls
+#          would work just as well. This here is a temporary workaround which removes the async feature on the bdk_esplora crate.
+#          See PR #1179 https://github.com/bitcoindevkit/bdk/pull/1179 for the fix in bdk.
+# bdk = { git = "https://github.com/thunderbiscuit/bdk.git", branch = "test-rust-tls", version = "1.0.0-alpha.2", features = ["all-keys", "keys-bip39"] }
+# bdk_esplora = { git = "https://github.com/thunderbiscuit/bdk.git", branch = "test-rust-tls", version = "0.4.0", package = "bdk_esplora", default-features = false, features = ["std", "blocking", "async-https-rustls"] }
+
+bdk_esplora = { version = "0.4.0", default-features = false, features = ["std", "blocking"] }
+uniffi = { version = "=0.25.1" }
+
+[build-dependencies]
+uniffi = { version = "=0.25.1", features = ["build"] }
+
+[dev-dependencies]
+uniffi = { version = "=0.25.1", features = ["bindgen-tests"] }
+assert_matches = "1.5.0"
+
+[profile.release-smaller]
+inherits = "release"
+opt-level = 'z'     # Optimize for size.
+lto = true          # Enable Link Time Optimization
+codegen-units = 1   # Reduce number of codegen units to increase optimizations.
+panic = "abort"     # Abort on panic
+strip = "debuginfo" # Partially strip symbols from binary

bdk-ffi/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi::generate_scaffolding("./src/bdk.udl").unwrap();
+}

bdk-ffi/src/bdk.udl

@@ -0,0 +1,307 @@
+namespace bdk {};
+
+// ------------------------------------------------------------------------
+// bdk crate - root module
+// ------------------------------------------------------------------------
+
+enum KeychainKind {
+  "External",
+  "Internal",
+};
+
+// ------------------------------------------------------------------------
+// bdk crate - wallet module
+// ------------------------------------------------------------------------
+
+[Error]
+enum BdkError {
+  "Generic",
+  "NoRecipients",
+  "NoUtxosSelected",
+  "OutputBelowDustLimit",
+  "InsufficientFunds",
+  "BnBTotalTriesExceeded",
+  "BnBNoExactMatch",
+  "UnknownUtxo",
+  "TransactionNotFound",
+  "TransactionConfirmed",
+  "IrreplaceableTransaction",
+  "FeeRateTooLow",
+  "FeeTooLow",
+  "FeeRateUnavailable",
+  "MissingKeyOrigin",
+  "Key",
+  "ChecksumMismatch",
+  "SpendingPolicyRequired",
+  "InvalidPolicyPathError",
+  "Signer",
+  "InvalidOutpoint",
+  "Descriptor",
+  "Miniscript",
+  "MiniscriptPsbt",
+  "Bip32",
+  "Psbt",
+};
+
+enum ChangeSpendPolicy {
+  "ChangeAllowed",
+  "OnlyChange",
+  "ChangeForbidden"
+};
+
+interface Balance {
+  u64 immature();
+
+  u64 trusted_pending();
+
+  u64 untrusted_pending();
+
+  u64 confirmed();
+
+  u64 trusted_spendable();
+
+  u64 total();
+};
+
+dictionary AddressInfo {
+  u32 index;
+  Address address;
+  KeychainKind keychain;
+};
+
+[Enum]
+interface AddressIndex {
+  New();
+  LastUnused();
+  Peek(u32 index);
+};
+
+interface Wallet {
+  [Name=new_no_persist, Throws=BdkError]
+  constructor(Descriptor descriptor, Descriptor? change_descriptor, Network network);
+
+  AddressInfo get_address(AddressIndex address_index);
+
+  AddressInfo get_internal_address(AddressIndex address_index);
+
+  Network network();
+
+  Balance get_balance();
+
+  boolean is_mine(Script script);
+
+  [Throws=BdkError]
+  void apply_update(Update update);
+
+  [Throws=BdkError]
+  boolean sign(PartiallySignedTransaction psbt);
+};
+
+interface Update {};
+
+interface TxBuilder {
+  constructor();
+
+  TxBuilder add_recipient(Script script, u64 amount);
+
+  TxBuilder set_recipients(sequence<ScriptAmount> script_amount);
+
+  TxBuilder add_unspendable(OutPoint unspendable);
+
+  TxBuilder add_utxo(OutPoint outpoint);
+
+  TxBuilder change_policy(ChangeSpendPolicy change_policy);
+
+  TxBuilder do_not_spend_change();
+
+  TxBuilder only_spend_change();
+
+  TxBuilder manually_selected_only();
+
+  TxBuilder fee_rate(float sat_per_vbyte);
+
+  TxBuilder drain_wallet();
+
+  [Throws=BdkError]
+  PartiallySignedTransaction finish([ByRef] Wallet wallet);
+};
+
+// ------------------------------------------------------------------------
+// bdk crate - descriptor module
+// ------------------------------------------------------------------------
+
+interface Mnemonic {
+  constructor(WordCount word_count);
+
+  [Name=from_string, Throws=BdkError]
+  constructor(string mnemonic);
+
+  [Name=from_entropy, Throws=BdkError]
+  constructor(sequence<u8> entropy);
+
+  string as_string();
+};
+
+interface DerivationPath {
+  [Throws=BdkError]
+  constructor(string path);
+};
+
+interface DescriptorSecretKey {
+  constructor(Network network, Mnemonic mnemonic, string? password);
+
+  [Name=from_string, Throws=BdkError]
+  constructor(string secret_key);
+
+  [Throws=BdkError]
+  DescriptorSecretKey derive(DerivationPath path);
+
+  [Throws=BdkError]
+  DescriptorSecretKey extend(DerivationPath path);
+
+  DescriptorPublicKey as_public();
+
+  sequence<u8> secret_bytes();
+
+  string as_string();
+};
+
+interface DescriptorPublicKey {
+  [Name=from_string, Throws=BdkError]
+  constructor(string public_key);
+
+  [Throws=BdkError]
+  DescriptorPublicKey derive(DerivationPath path);
+
+  [Throws=BdkError]
+  DescriptorPublicKey extend(DerivationPath path);
+
+  string as_string();
+};
+
+interface Descriptor {
+  [Throws=BdkError]
+  constructor(string descriptor, Network network);
+
+  [Name=new_bip44]
+  constructor(DescriptorSecretKey secret_key, KeychainKind keychain, Network network);
+
+  [Name=new_bip44_public]
+  constructor(DescriptorPublicKey public_key, string fingerprint, KeychainKind keychain, Network network);
+
+  [Name=new_bip49]
+  constructor(DescriptorSecretKey secret_key, KeychainKind keychain, Network network);
+
+  [Name=new_bip49_public]
+  constructor(DescriptorPublicKey public_key, string fingerprint, KeychainKind keychain, Network network);
+
+  [Name=new_bip84]
+  constructor(DescriptorSecretKey secret_key, KeychainKind keychain, Network network);
+
+  [Name=new_bip84_public]
+  constructor(DescriptorPublicKey public_key, string fingerprint, KeychainKind keychain, Network network);
+
+  [Name=new_bip86]
+  constructor(DescriptorSecretKey secret_key, KeychainKind keychain, Network network);
+
+  [Name=new_bip86_public]
+  constructor(DescriptorPublicKey public_key, string fingerprint, KeychainKind keychain, Network network);
+
+  string as_string();
+
+  string as_string_private();
+};
+
+// ------------------------------------------------------------------------
+// bdk_esplora crate
+// ------------------------------------------------------------------------
+
+interface EsploraClient {
+  constructor(string url);
+
+  [Throws=BdkError]
+  Update scan(Wallet wallet, u64 stop_gap, u64 parallel_requests);
+
+  [Throws=BdkError]
+  void broadcast(Transaction transaction);
+};
+
+// ------------------------------------------------------------------------
+// bdk-ffi-defined types
+// ------------------------------------------------------------------------
+
+dictionary ScriptAmount {
+  Script script;
+  u64 amount;
+};
+
+// ------------------------------------------------------------------------
+// bdk crate - bitcoin re-exports
+// ------------------------------------------------------------------------
+
+interface Script {
+  constructor(sequence<u8> raw_output_script);
+
+  sequence<u8> to_bytes();
+};
+
+enum Network {
+  "Bitcoin",
+  "Testnet",
+  "Signet",
+  "Regtest",
+};
+
+enum WordCount {
+  "Words12",
+  "Words15",
+  "Words18",
+  "Words21",
+  "Words24",
+};
+
+interface Address {
+  [Throws=BdkError]
+  constructor(string address, Network network);
+
+  Network network();
+
+  Script script_pubkey();
+
+  string to_qr_uri();
+
+  string as_string();
+};
+
+interface Transaction {
+  [Throws=BdkError]
+  constructor(sequence<u8> transaction_bytes);
+
+  string txid();
+
+  u64 size();
+
+  u64 vsize();
+
+  boolean is_coin_base();
+
+  boolean is_explicitly_rbf();
+
+  boolean is_lock_time_enabled();
+
+  i32 version();
+};
+
+interface PartiallySignedTransaction {
+  [Throws=BdkError]
+  constructor(string psbt_base64);
+
+  string serialize();
+
+  Transaction extract_tx();
+};
+
+dictionary OutPoint {
+  string txid;
+  u32 vout;
+};

bdk-ffi/src/bitcoin.rs

@@ -0,0 +1,311 @@
+use bdk::bitcoin::address::{NetworkChecked, NetworkUnchecked};
+use bdk::bitcoin::blockdata::script::ScriptBuf as BdkScriptBuf;
+use bdk::bitcoin::consensus::Decodable;
+use bdk::bitcoin::network::constants::Network as BdkNetwork;
+use bdk::bitcoin::psbt::PartiallySignedTransaction as BdkPartiallySignedTransaction;
+use bdk::bitcoin::Address as BdkAddress;
+use bdk::bitcoin::OutPoint as BdkOutPoint;
+use bdk::bitcoin::Transaction as BdkTransaction;
+use bdk::bitcoin::Txid;
+use bdk::Error as BdkError;
+
+use std::io::Cursor;
+use std::str::FromStr;
+use std::sync::{Arc, Mutex};
+
+/// A Bitcoin script.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Script(pub(crate) BdkScriptBuf);
+
+impl Script {
+    pub fn new(raw_output_script: Vec<u8>) -> Self {
+        let script: BdkScriptBuf = raw_output_script.into();
+        Script(script)
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        self.0.to_bytes()
+    }
+}
+
+impl From<BdkScriptBuf> for Script {
+    fn from(script: BdkScriptBuf) -> Self {
+        Script(script)
+    }
+}
+
+pub enum Network {
+    /// Mainnet Bitcoin.
+    Bitcoin,
+    /// Bitcoin's testnet network.
+    Testnet,
+    /// Bitcoin's signet network.
+    Signet,
+    /// Bitcoin's regtest network.
+    Regtest,
+}
+
+impl From<Network> for BdkNetwork {
+    fn from(network: Network) -> Self {
+        match network {
+            Network::Bitcoin => BdkNetwork::Bitcoin,
+            Network::Testnet => BdkNetwork::Testnet,
+            Network::Signet => BdkNetwork::Signet,
+            Network::Regtest => BdkNetwork::Regtest,
+        }
+    }
+}
+
+impl From<BdkNetwork> for Network {
+    fn from(network: BdkNetwork) -> Self {
+        match network {
+            BdkNetwork::Bitcoin => Network::Bitcoin,
+            BdkNetwork::Testnet => Network::Testnet,
+            BdkNetwork::Signet => Network::Signet,
+            BdkNetwork::Regtest => Network::Regtest,
+            _ => panic!("Network {} not supported", network),
+        }
+    }
+}
+
+/// A Bitcoin address.
+#[derive(Debug, PartialEq, Eq)]
+pub struct Address {
+    inner: BdkAddress<NetworkChecked>,
+}
+
+impl Address {
+    pub fn new(address: String, network: Network) -> Result<Self, BdkError> {
+        let parsed_address = address
+            .parse::<bdk::bitcoin::Address<NetworkUnchecked>>()
+            .map_err(|e| BdkError::Generic(e.to_string()))?;
+
+        let network_checked_address = parsed_address
+            .require_network(network.into())
+            .map_err(|e| BdkError::Generic(e.to_string()))?;
+
+        Ok(Address {
+            inner: network_checked_address,
+        })
+    }
+
+    /// alternative constructor
+    // fn from_script(script: Arc<Script>, network: Network) -> Result<Self, BdkError> {
+    //     BdkAddress::from_script(&script.inner, network)
+    //         .map(|a| Address { inner: a })
+    //         .map_err(|e| BdkError::Generic(e.to_string()))
+    // }
+    //
+    // fn payload(&self) -> Payload {
+    //     match &self.inner.payload.clone() {
+    //         BdkPayload::PubkeyHash(pubkey_hash) => Payload::PubkeyHash {
+    //             pubkey_hash: pubkey_hash.to_vec(),
+    //         },
+    //         BdkPayload::ScriptHash(script_hash) => Payload::ScriptHash {
+    //             script_hash: script_hash.to_vec(),
+    //         },
+    //         BdkPayload::WitnessProgram { version, program } => Payload::WitnessProgram {
+    //             version: *version,
+    //             program: program.clone(),
+    //         },
+    //     }
+    // }
+
+    pub fn network(&self) -> Network {
+        self.inner.network.into()
+    }
+
+    pub fn script_pubkey(&self) -> Arc<Script> {
+        Arc::new(Script(self.inner.script_pubkey()))
+    }
+
+    pub fn to_qr_uri(&self) -> String {
+        self.inner.to_qr_uri()
+    }
+
+    pub fn as_string(&self) -> String {
+        self.inner.to_string()
+    }
+}
+
+impl From<Address> for BdkAddress {
+    fn from(address: Address) -> Self {
+        address.inner
+    }
+}
+
+impl From<BdkAddress> for Address {
+    fn from(address: BdkAddress) -> Self {
+        Address { inner: address }
+    }
+}
+
+/// A Bitcoin transaction.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Transaction {
+    inner: BdkTransaction,
+}
+
+impl Transaction {
+    pub fn new(transaction_bytes: Vec<u8>) -> Result<Self, BdkError> {
+        let mut decoder = Cursor::new(transaction_bytes);
+        let tx: BdkTransaction = BdkTransaction::consensus_decode(&mut decoder)
+            .map_err(|e| BdkError::Generic(e.to_string()))?;
+        Ok(Transaction { inner: tx })
+    }
+
+    pub fn txid(&self) -> String {
+        self.inner.txid().to_string()
+    }
+
+    // fn weight(&self) -> u64 {
+    //     self.inner.weight() as u64
+    // }
+
+    pub fn size(&self) -> u64 {
+        self.inner.size() as u64
+    }
+
+    pub fn vsize(&self) -> u64 {
+        self.inner.vsize() as u64
+    }
+
+    // fn serialize(&self) -> Vec<u8> {
+    //     self.inner.serialize()
+    // }
+
+    pub fn is_coin_base(&self) -> bool {
+        self.inner.is_coin_base()
+    }
+
+    pub fn is_explicitly_rbf(&self) -> bool {
+        self.inner.is_explicitly_rbf()
+    }
+
+    pub fn is_lock_time_enabled(&self) -> bool {
+        self.inner.is_lock_time_enabled()
+    }
+
+    pub fn version(&self) -> i32 {
+        self.inner.version
+    }
+
+    // fn lock_time(&self) -> u32 {
+    //     self.inner.lock_time.0
+    // }
+
+    // fn input(&self) -> Vec<TxIn> {
+    //     self.inner.input.iter().map(|x| x.into()).collect()
+    // }
+    //
+    // fn output(&self) -> Vec<TxOut> {
+    //     self.inner.output.iter().map(|x| x.into()).collect()
+    // }
+}
+
+impl From<BdkTransaction> for Transaction {
+    fn from(tx: BdkTransaction) -> Self {
+        Transaction { inner: tx }
+    }
+}
+
+impl From<Transaction> for BdkTransaction {
+    fn from(tx: Transaction) -> Self {
+        tx.inner
+    }
+}
+
+pub struct PartiallySignedTransaction {
+    pub(crate) inner: Mutex<BdkPartiallySignedTransaction>,
+}
+
+impl PartiallySignedTransaction {
+    pub(crate) fn new(psbt_base64: String) -> Result<Self, BdkError> {
+        let psbt: BdkPartiallySignedTransaction =
+            BdkPartiallySignedTransaction::from_str(&psbt_base64)
+                .map_err(|e| BdkError::Generic(e.to_string()))?;
+
+        Ok(PartiallySignedTransaction {
+            inner: Mutex::new(psbt),
+        })
+    }
+
+    pub(crate) fn serialize(&self) -> String {
+        let psbt = self.inner.lock().unwrap().clone();
+        psbt.to_string()
+    }
+
+    // pub(crate) fn txid(&self) -> String {
+    //     let tx = self.inner.lock().unwrap().clone().extract_tx();
+    //     let txid = tx.txid();
+    //     txid.to_hex()
+    // }
+
+    /// Return the transaction.
+    pub(crate) fn extract_tx(&self) -> Arc<Transaction> {
+        let tx = self.inner.lock().unwrap().clone().extract_tx();
+        Arc::new(tx.into())
+    }
+
+    // /// Combines this PartiallySignedTransaction with other PSBT as described by BIP 174.
+    // ///
+    // /// In accordance with BIP 174 this function is commutative i.e., `A.combine(B) == B.combine(A)`
+    // pub(crate) fn combine(
+    //     &self,
+    //     other: Arc<PartiallySignedTransaction>,
+    // ) -> Result<Arc<PartiallySignedTransaction>, BdkError> {
+    //     let other_psbt = other.inner.lock().unwrap().clone();
+    //     let mut original_psbt = self.inner.lock().unwrap().clone();
+    //
+    //     original_psbt.combine(other_psbt)?;
+    //     Ok(Arc::new(PartiallySignedTransaction {
+    //         inner: Mutex::new(original_psbt),
+    //     }))
+    // }
+
+    // /// The total transaction fee amount, sum of input amounts minus sum of output amounts, in Sats.
+    // /// If the PSBT is missing a TxOut for an input returns None.
+    // pub(crate) fn fee_amount(&self) -> Option<u64> {
+    //     self.inner.lock().unwrap().fee_amount()
+    // }
+
+    // /// The transaction's fee rate. This value will only be accurate if calculated AFTER the
+    // /// `PartiallySignedTransaction` is finalized and all witness/signature data is added to the
+    // /// transaction.
+    // /// If the PSBT is missing a TxOut for an input returns None.
+    // pub(crate) fn fee_rate(&self) -> Option<Arc<FeeRate>> {
+    //     self.inner.lock().unwrap().fee_rate().map(Arc::new)
+    // }
+
+    // /// Serialize the PSBT data structure as a String of JSON.
+    // pub(crate) fn json_serialize(&self) -> String {
+    //     let psbt = self.inner.lock().unwrap();
+    //     serde_json::to_string(psbt.deref()).unwrap()
+    // }
+}
+
+impl From<BdkPartiallySignedTransaction> for PartiallySignedTransaction {
+    fn from(psbt: BdkPartiallySignedTransaction) -> Self {
+        PartiallySignedTransaction {
+            inner: Mutex::new(psbt),
+        }
+    }
+}
+
+/// A reference to a transaction output.
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct OutPoint {
+    /// The referenced transaction's txid.
+    pub txid: String,
+    /// The index of the referenced output in its transaction's vout.
+    pub vout: u32,
+}
+
+impl From<&OutPoint> for BdkOutPoint {
+    fn from(outpoint: &OutPoint) -> Self {
+        BdkOutPoint {
+            txid: Txid::from_str(&outpoint.txid).unwrap(),
+            vout: outpoint.vout,
+        }
+    }
+}

bdk-ffi/src/descriptor.rs

@@ -0,0 +1,419 @@
+use crate::keys::DescriptorPublicKey;
+use crate::keys::DescriptorSecretKey;
+use crate::Network;
+
+use bdk::bitcoin::bip32::Fingerprint;
+use bdk::bitcoin::key::Secp256k1;
+use bdk::descriptor::{ExtendedDescriptor, IntoWalletDescriptor};
+use bdk::keys::DescriptorPublicKey as BdkDescriptorPublicKey;
+use bdk::keys::{DescriptorSecretKey as BdkDescriptorSecretKey, KeyMap};
+use bdk::template::{
+    Bip44, Bip44Public, Bip49, Bip49Public, Bip84, Bip84Public, Bip86, Bip86Public,
+    DescriptorTemplate,
+};
+use bdk::Error as BdkError;
+use bdk::KeychainKind;
+
+use std::str::FromStr;
+use std::sync::Arc;
+
+#[derive(Debug)]
+pub struct Descriptor {
+    pub extended_descriptor: ExtendedDescriptor,
+    pub key_map: KeyMap,
+}
+
+impl Descriptor {
+    pub(crate) fn new(descriptor: String, network: Network) -> Result<Self, BdkError> {
+        let secp = Secp256k1::new();
+        let (extended_descriptor, key_map) =
+            descriptor.into_wallet_descriptor(&secp, network.into())?;
+        Ok(Self {
+            extended_descriptor,
+            key_map,
+        })
+    }
+
+    pub(crate) fn new_bip44(
+        secret_key: Arc<DescriptorSecretKey>,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let derivable_key = &secret_key.inner;
+
+        match derivable_key {
+            BdkDescriptorSecretKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) = Bip44(derivable_key, keychain_kind)
+                    .build(network.into())
+                    .unwrap();
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip44_public(
+        public_key: Arc<DescriptorPublicKey>,
+        fingerprint: String,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let fingerprint = Fingerprint::from_str(fingerprint.as_str()).unwrap();
+        let derivable_key = &public_key.inner;
+
+        match derivable_key {
+            BdkDescriptorPublicKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) =
+                    Bip44Public(derivable_key, fingerprint, keychain_kind)
+                        .build(network.into())
+                        .unwrap();
+
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip49(
+        secret_key: Arc<DescriptorSecretKey>,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let derivable_key = &secret_key.inner;
+
+        match derivable_key {
+            BdkDescriptorSecretKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) = Bip49(derivable_key, keychain_kind)
+                    .build(network.into())
+                    .unwrap();
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip49_public(
+        public_key: Arc<DescriptorPublicKey>,
+        fingerprint: String,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let fingerprint = Fingerprint::from_str(fingerprint.as_str()).unwrap();
+        let derivable_key = &public_key.inner;
+
+        match derivable_key {
+            BdkDescriptorPublicKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) =
+                    Bip49Public(derivable_key, fingerprint, keychain_kind)
+                        .build(network.into())
+                        .unwrap();
+
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip84(
+        secret_key: Arc<DescriptorSecretKey>,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let derivable_key = &secret_key.inner;
+
+        match derivable_key {
+            BdkDescriptorSecretKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) = Bip84(derivable_key, keychain_kind)
+                    .build(network.into())
+                    .unwrap();
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip84_public(
+        public_key: Arc<DescriptorPublicKey>,
+        fingerprint: String,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let fingerprint = Fingerprint::from_str(fingerprint.as_str()).unwrap();
+        let derivable_key = &public_key.inner;
+
+        match derivable_key {
+            BdkDescriptorPublicKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) =
+                    Bip84Public(derivable_key, fingerprint, keychain_kind)
+                        .build(network.into())
+                        .unwrap();
+
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip86(
+        secret_key: Arc<DescriptorSecretKey>,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let derivable_key = &secret_key.inner;
+
+        match derivable_key {
+            BdkDescriptorSecretKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) = Bip86(derivable_key, keychain_kind)
+                    .build(network.into())
+                    .unwrap();
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn new_bip86_public(
+        public_key: Arc<DescriptorPublicKey>,
+        fingerprint: String,
+        keychain_kind: KeychainKind,
+        network: Network,
+    ) -> Self {
+        let fingerprint = Fingerprint::from_str(fingerprint.as_str()).unwrap();
+        let derivable_key = &public_key.inner;
+
+        match derivable_key {
+            BdkDescriptorPublicKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let derivable_key = descriptor_x_key.xkey;
+                let (extended_descriptor, key_map, _) =
+                    Bip86Public(derivable_key, fingerprint, keychain_kind)
+                        .build(network.into())
+                        .unwrap();
+
+                Self {
+                    extended_descriptor,
+                    key_map,
+                }
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => {
+                unreachable!()
+            }
+        }
+    }
+
+    pub(crate) fn as_string_private(&self) -> String {
+        let descriptor = &self.extended_descriptor;
+        let key_map = &self.key_map;
+        descriptor.to_string_with_secret(key_map)
+    }
+
+    pub(crate) fn as_string(&self) -> String {
+        self.extended_descriptor.to_string()
+    }
+}
+
+// // The goal of these tests to to ensure `bdk-ffi` intermediate code correctly calls `bdk` APIs.
+// // These tests should not be used to verify `bdk` behavior that is already tested in the `bdk`
+// // crate.
+#[cfg(test)]
+mod test {
+    use crate::*;
+    use assert_matches::assert_matches;
+    use bdk::descriptor::DescriptorError::Key;
+    use bdk::keys::KeyError::InvalidNetwork;
+
+    fn get_descriptor_secret_key() -> DescriptorSecretKey {
+        let mnemonic = Mnemonic::from_string("chaos fabric time speed sponsor all flat solution wisdom trophy crack object robot pave observe combine where aware bench orient secret primary cable detect".to_string()).unwrap();
+        DescriptorSecretKey::new(Network::Testnet, Arc::new(mnemonic), None)
+    }
+
+    #[test]
+    fn test_descriptor_templates() {
+        let master: Arc<DescriptorSecretKey> = Arc::new(get_descriptor_secret_key());
+        println!("Master: {:?}", master.as_string());
+        // tprv8ZgxMBicQKsPdWuqM1t1CDRvQtQuBPyfL6GbhQwtxDKgUAVPbxmj71pRA8raTqLrec5LyTs5TqCxdABcZr77bt2KyWA5bizJHnC4g4ysm4h
+        let handmade_public_44 = master
+            .derive(Arc::new(
+                DerivationPath::new("m/44h/1h/0h".to_string()).unwrap(),
+            ))
+            .unwrap()
+            .as_public();
+        println!("Public 44: {}", handmade_public_44.as_string());
+        // Public 44: [d1d04177/44'/1'/0']tpubDCoPjomfTqh1e7o1WgGpQtARWtkueXQAepTeNpWiitS3Sdv8RKJ1yvTrGHcwjDXp2SKyMrTEca4LoN7gEUiGCWboyWe2rz99Kf4jK4m2Zmx/*
+        let handmade_public_49 = master
+            .derive(Arc::new(
+                DerivationPath::new("m/49h/1h/0h".to_string()).unwrap(),
+            ))
+            .unwrap()
+            .as_public();
+        println!("Public 49: {}", handmade_public_49.as_string());
+        // Public 49: [d1d04177/49'/1'/0']tpubDC65ZRvk1NDddHrVAUAZrUPJ772QXzooNYmPywYF9tMyNLYKf5wpKE7ZJvK9kvfG3FV7rCsHBNXy1LVKW95jrmC7c7z4hq7a27aD2sRrAhR/*
+        let handmade_public_84 = master
+            .derive(Arc::new(
+                DerivationPath::new("m/84h/1h/0h".to_string()).unwrap(),
+            ))
+            .unwrap()
+            .as_public();
+        println!("Public 84: {}", handmade_public_84.as_string());
+        // Public 84: [d1d04177/84'/1'/0']tpubDDNxbq17egjFk2edjv8oLnzxk52zny9aAYNv9CMqTzA4mQDiQq818sEkNe9Gzmd4QU8558zftqbfoVBDQorG3E4Wq26tB2JeE4KUoahLkx6/*
+        let handmade_public_86 = master
+            .derive(Arc::new(
+                DerivationPath::new("m/86h/1h/0h".to_string()).unwrap(),
+            ))
+            .unwrap()
+            .as_public();
+        println!("Public 86: {}", handmade_public_86.as_string());
+        // Public 86: [d1d04177/86'/1'/0']tpubDCJzjbcGbdEfXMWaL6QmgVmuSfXkrue7m2YNoacWwyc7a2XjXaKojRqNEbo41CFL3PyYmKdhwg2fkGpLX4SQCbQjCGxAkWHJTw9WEeenrJb/*
+        let template_private_44 =
+            Descriptor::new_bip44(master.clone(), KeychainKind::External, Network::Testnet);
+        let template_private_49 =
+            Descriptor::new_bip49(master.clone(), KeychainKind::External, Network::Testnet);
+        let template_private_84 =
+            Descriptor::new_bip84(master.clone(), KeychainKind::External, Network::Testnet);
+        let template_private_86 =
+            Descriptor::new_bip86(master, KeychainKind::External, Network::Testnet);
+        // the extended public keys are the same when creating them manually as they are with the templates
+        println!("Template 49: {}", template_private_49.as_string());
+        println!("Template 44: {}", template_private_44.as_string());
+        println!("Template 84: {}", template_private_84.as_string());
+        println!("Template 86: {}", template_private_86.as_string());
+        let template_public_44 = Descriptor::new_bip44_public(
+            handmade_public_44,
+            "d1d04177".to_string(),
+            KeychainKind::External,
+            Network::Testnet,
+        );
+        let template_public_49 = Descriptor::new_bip49_public(
+            handmade_public_49,
+            "d1d04177".to_string(),
+            KeychainKind::External,
+            Network::Testnet,
+        );
+        let template_public_84 = Descriptor::new_bip84_public(
+            handmade_public_84,
+            "d1d04177".to_string(),
+            KeychainKind::External,
+            Network::Testnet,
+        );
+        let template_public_86 = Descriptor::new_bip86_public(
+            handmade_public_86,
+            "d1d04177".to_string(),
+            KeychainKind::External,
+            Network::Testnet,
+        );
+        println!("Template public 49: {}", template_public_49.as_string());
+        println!("Template public 44: {}", template_public_44.as_string());
+        println!("Template public 84: {}", template_public_84.as_string());
+        println!("Template public 86: {}", template_public_86.as_string());
+        // when using a public key, both as_string and as_string_private return the same string
+        assert_eq!(
+            template_public_44.as_string_private(),
+            template_public_44.as_string()
+        );
+        assert_eq!(
+            template_public_49.as_string_private(),
+            template_public_49.as_string()
+        );
+        assert_eq!(
+            template_public_84.as_string_private(),
+            template_public_84.as_string()
+        );
+        assert_eq!(
+            template_public_86.as_string_private(),
+            template_public_86.as_string()
+        );
+        // when using as_string on a private key, we get the same result as when using it on a public key
+        assert_eq!(
+            template_private_44.as_string(),
+            template_public_44.as_string()
+        );
+        assert_eq!(
+            template_private_49.as_string(),
+            template_public_49.as_string()
+        );
+        assert_eq!(
+            template_private_84.as_string(),
+            template_public_84.as_string()
+        );
+        assert_eq!(
+            template_private_86.as_string(),
+            template_public_86.as_string()
+        );
+    }
+    #[test]
+    fn test_descriptor_from_string() {
+        let descriptor1 = Descriptor::new("wpkh(tprv8hwWMmPE4BVNxGdVt3HhEERZhondQvodUY7Ajyseyhudr4WabJqWKWLr4Wi2r26CDaNCQhhxEftEaNzz7dPGhWuKFU4VULesmhEfZYyBXdE/0/*)".to_string(), Network::Testnet);
+        let descriptor2 = Descriptor::new("wpkh(tprv8hwWMmPE4BVNxGdVt3HhEERZhondQvodUY7Ajyseyhudr4WabJqWKWLr4Wi2r26CDaNCQhhxEftEaNzz7dPGhWuKFU4VULesmhEfZYyBXdE/0/*)".to_string(), Network::Bitcoin);
+        // Creating a Descriptor using an extended key that doesn't match the network provided will throw and InvalidNetwork Error
+        assert!(descriptor1.is_ok());
+        assert_matches!(
+            descriptor2.unwrap_err(),
+            bdk::Error::Descriptor(Key(InvalidNetwork))
+        )
+    }
+}

bdk-ffi/src/esplora.rs

@@ -0,0 +1,68 @@
+use crate::wallet::{Update, Wallet};
+use std::ops::Deref;
+
+use bdk::wallet::Update as BdkUpdate;
+use bdk::Error as BdkError;
+use bdk_esplora::esplora_client::{BlockingClient, Builder};
+use bdk_esplora::EsploraExt;
+
+use std::sync::Arc;
+
+pub struct EsploraClient(BlockingClient);
+
+impl EsploraClient {
+    pub fn new(url: String) -> Self {
+        let client = Builder::new(url.as_str()).build_blocking().unwrap();
+        Self(client)
+    }
+
+    // This is a temporary solution for scanning. The long-term solution involves not passing
+    // the wallet to the client at all.
+    pub fn scan(
+        &self,
+        wallet: Arc<Wallet>,
+        stop_gap: u64,
+        parallel_requests: u64,
+    ) -> Result<Arc<Update>, BdkError> {
+        let wallet = wallet.get_wallet();
+
+        let previous_tip = wallet.latest_checkpoint();
+        let keychain_spks = wallet.spks_of_all_keychains().into_iter().collect();
+
+        let (update_graph, last_active_indices) = self
+            .0
+            .scan_txs_with_keychains(
+                keychain_spks,
+                None,
+                None,
+                stop_gap as usize,
+                parallel_requests as usize,
+            )
+            .unwrap();
+
+        let missing_heights = update_graph.missing_heights(wallet.local_chain());
+        let chain_update = self
+            .0
+            .update_local_chain(previous_tip, missing_heights)
+            .unwrap();
+
+        let update = BdkUpdate {
+            last_active_indices,
+            graph: update_graph,
+            chain: Some(chain_update),
+        };
+
+        Ok(Arc::new(Update(update)))
+    }
+
+    // pub fn sync();
+
+    pub fn broadcast(&self, transaction: Arc<crate::bitcoin::Transaction>) -> Result<(), BdkError> {
+        let bdk_transaction: bdk::bitcoin::Transaction = transaction.deref().clone().into();
+        self.0
+            .broadcast(&bdk_transaction)
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+
+    // pub fn estimate_fee();
+}

bdk-ffi/src/keys.rs

@@ -0,0 +1,398 @@
+use crate::Network;
+
+use bdk::bitcoin::bip32::DerivationPath as BdkDerivationPath;
+use bdk::bitcoin::key::Secp256k1;
+use bdk::bitcoin::secp256k1::rand;
+use bdk::bitcoin::secp256k1::rand::Rng;
+use bdk::keys::bip39::WordCount;
+use bdk::keys::bip39::{Language, Mnemonic as BdkMnemonic};
+use bdk::keys::{
+    DerivableKey, DescriptorPublicKey as BdkDescriptorPublicKey,
+    DescriptorSecretKey as BdkDescriptorSecretKey, ExtendedKey, GeneratableKey, GeneratedKey,
+};
+use bdk::miniscript::descriptor::{DescriptorXKey, Wildcard};
+use bdk::miniscript::BareCtx;
+use bdk::Error as BdkError;
+
+use std::ops::Deref;
+use std::str::FromStr;
+use std::sync::{Arc, Mutex};
+
+/// Mnemonic phrases are a human-readable version of the private keys.
+/// Supported number of words are 12, 15, 18, 21 and 24.
+pub(crate) struct Mnemonic {
+    inner: BdkMnemonic,
+}
+
+impl Mnemonic {
+    /// Generates Mnemonic with a random entropy
+    pub(crate) fn new(word_count: WordCount) -> Self {
+        // TODO 4: I DON'T KNOW IF THIS IS A DECENT WAY TO GENERATE ENTROPY PLEASE CONFIRM
+        let mut rng = rand::thread_rng();
+        let mut entropy = [0u8; 32];
+        rng.fill(&mut entropy);
+
+        let generated_key: GeneratedKey<_, BareCtx> =
+            BdkMnemonic::generate_with_entropy((word_count, Language::English), entropy).unwrap();
+        let mnemonic = BdkMnemonic::parse_in(Language::English, generated_key.to_string()).unwrap();
+        Mnemonic { inner: mnemonic }
+    }
+
+    /// Parse a Mnemonic with given string
+    pub(crate) fn from_string(mnemonic: String) -> Result<Self, BdkError> {
+        BdkMnemonic::from_str(&mnemonic)
+            .map(|m| Mnemonic { inner: m })
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+
+    /// Create a new Mnemonic in the specified language from the given entropy.
+    /// Entropy must be a multiple of 32 bits (4 bytes) and 128-256 bits in length.
+    pub(crate) fn from_entropy(entropy: Vec<u8>) -> Result<Self, BdkError> {
+        BdkMnemonic::from_entropy(entropy.as_slice())
+            .map(|m| Mnemonic { inner: m })
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+
+    /// Returns Mnemonic as string
+    pub(crate) fn as_string(&self) -> String {
+        self.inner.to_string()
+    }
+}
+
+pub(crate) struct DerivationPath {
+    inner_mutex: Mutex<BdkDerivationPath>,
+}
+
+impl DerivationPath {
+    pub(crate) fn new(path: String) -> Result<Self, BdkError> {
+        BdkDerivationPath::from_str(&path)
+            .map(|x| DerivationPath {
+                inner_mutex: Mutex::new(x),
+            })
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+}
+
+#[derive(Debug)]
+pub struct DescriptorSecretKey {
+    pub(crate) inner: BdkDescriptorSecretKey,
+}
+
+impl DescriptorSecretKey {
+    pub(crate) fn new(network: Network, mnemonic: Arc<Mnemonic>, password: Option<String>) -> Self {
+        let mnemonic = mnemonic.inner.clone();
+        let xkey: ExtendedKey = (mnemonic, password).into_extended_key().unwrap();
+        let descriptor_secret_key = BdkDescriptorSecretKey::XPrv(DescriptorXKey {
+            origin: None,
+            xkey: xkey.into_xprv(network.into()).unwrap(),
+            derivation_path: BdkDerivationPath::master(),
+            wildcard: Wildcard::Unhardened,
+        });
+        Self {
+            inner: descriptor_secret_key,
+        }
+    }
+
+    pub(crate) fn from_string(private_key: String) -> Result<Self, BdkError> {
+        let descriptor_secret_key = BdkDescriptorSecretKey::from_str(private_key.as_str())
+            .map_err(|e| BdkError::Generic(e.to_string()))?;
+        Ok(Self {
+            inner: descriptor_secret_key,
+        })
+    }
+
+    pub(crate) fn derive(&self, path: Arc<DerivationPath>) -> Result<Arc<Self>, BdkError> {
+        let secp = Secp256k1::new();
+        let descriptor_secret_key = &self.inner;
+        let path = path.inner_mutex.lock().unwrap().deref().clone();
+        match descriptor_secret_key {
+            BdkDescriptorSecretKey::Single(_) => Err(BdkError::Generic(
+                "Cannot derive from a single key".to_string(),
+            )),
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let derived_xprv = descriptor_x_key.xkey.derive_priv(&secp, &path)?;
+                let key_source = match descriptor_x_key.origin.clone() {
+                    Some((fingerprint, origin_path)) => (fingerprint, origin_path.extend(path)),
+                    None => (descriptor_x_key.xkey.fingerprint(&secp), path),
+                };
+                let derived_descriptor_secret_key = BdkDescriptorSecretKey::XPrv(DescriptorXKey {
+                    origin: Some(key_source),
+                    xkey: derived_xprv,
+                    derivation_path: BdkDerivationPath::default(),
+                    wildcard: descriptor_x_key.wildcard,
+                });
+                Ok(Arc::new(Self {
+                    inner: derived_descriptor_secret_key,
+                }))
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => Err(BdkError::Generic(
+                "Cannot derive from a multi key".to_string(),
+            )),
+        }
+    }
+
+    pub(crate) fn extend(&self, path: Arc<DerivationPath>) -> Result<Arc<Self>, BdkError> {
+        let descriptor_secret_key = &self.inner;
+        let path = path.inner_mutex.lock().unwrap().deref().clone();
+        match descriptor_secret_key {
+            BdkDescriptorSecretKey::Single(_) => Err(BdkError::Generic(
+                "Cannot extend from a single key".to_string(),
+            )),
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                let extended_path = descriptor_x_key.derivation_path.extend(path);
+                let extended_descriptor_secret_key = BdkDescriptorSecretKey::XPrv(DescriptorXKey {
+                    origin: descriptor_x_key.origin.clone(),
+                    xkey: descriptor_x_key.xkey,
+                    derivation_path: extended_path,
+                    wildcard: descriptor_x_key.wildcard,
+                });
+                Ok(Arc::new(Self {
+                    inner: extended_descriptor_secret_key,
+                }))
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => Err(BdkError::Generic(
+                "Cannot derive from a multi key".to_string(),
+            )),
+        }
+    }
+
+    pub(crate) fn as_public(&self) -> Arc<DescriptorPublicKey> {
+        let secp = Secp256k1::new();
+        let descriptor_public_key = self.inner.to_public(&secp).unwrap();
+        Arc::new(DescriptorPublicKey {
+            inner: descriptor_public_key,
+        })
+    }
+
+    /// Get the private key as bytes.
+    pub(crate) fn secret_bytes(&self) -> Vec<u8> {
+        let inner = &self.inner;
+        let secret_bytes: Vec<u8> = match inner {
+            BdkDescriptorSecretKey::Single(_) => {
+                unreachable!()
+            }
+            BdkDescriptorSecretKey::XPrv(descriptor_x_key) => {
+                descriptor_x_key.xkey.private_key.secret_bytes().to_vec()
+            }
+            BdkDescriptorSecretKey::MultiXPrv(_) => {
+                unreachable!()
+            }
+        };
+
+        secret_bytes
+    }
+
+    pub(crate) fn as_string(&self) -> String {
+        self.inner.to_string()
+    }
+}
+
+#[derive(Debug)]
+pub struct DescriptorPublicKey {
+    pub(crate) inner: BdkDescriptorPublicKey,
+}
+
+impl DescriptorPublicKey {
+    pub(crate) fn from_string(public_key: String) -> Result<Self, BdkError> {
+        let descriptor_public_key = BdkDescriptorPublicKey::from_str(public_key.as_str())
+            .map_err(|e| BdkError::Generic(e.to_string()))?;
+        Ok(Self {
+            inner: descriptor_public_key,
+        })
+    }
+
+    pub(crate) fn derive(&self, path: Arc<DerivationPath>) -> Result<Arc<Self>, BdkError> {
+        let secp = Secp256k1::new();
+        let descriptor_public_key = &self.inner;
+        let path = path.inner_mutex.lock().unwrap().deref().clone();
+
+        match descriptor_public_key {
+            BdkDescriptorPublicKey::Single(_) => Err(BdkError::Generic(
+                "Cannot derive from a single key".to_string(),
+            )),
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let derived_xpub = descriptor_x_key.xkey.derive_pub(&secp, &path)?;
+                let key_source = match descriptor_x_key.origin.clone() {
+                    Some((fingerprint, origin_path)) => (fingerprint, origin_path.extend(path)),
+                    None => (descriptor_x_key.xkey.fingerprint(), path),
+                };
+                let derived_descriptor_public_key = BdkDescriptorPublicKey::XPub(DescriptorXKey {
+                    origin: Some(key_source),
+                    xkey: derived_xpub,
+                    derivation_path: BdkDerivationPath::default(),
+                    wildcard: descriptor_x_key.wildcard,
+                });
+                Ok(Arc::new(Self {
+                    inner: derived_descriptor_public_key,
+                }))
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => Err(BdkError::Generic(
+                "Cannot derive from a multi xpub".to_string(),
+            )),
+        }
+    }
+
+    pub(crate) fn extend(&self, path: Arc<DerivationPath>) -> Result<Arc<Self>, BdkError> {
+        let descriptor_public_key = &self.inner;
+        let path = path.inner_mutex.lock().unwrap().deref().clone();
+        match descriptor_public_key {
+            BdkDescriptorPublicKey::Single(_) => Err(BdkError::Generic(
+                "Cannot extend from a single key".to_string(),
+            )),
+            BdkDescriptorPublicKey::XPub(descriptor_x_key) => {
+                let extended_path = descriptor_x_key.derivation_path.extend(path);
+                let extended_descriptor_public_key = BdkDescriptorPublicKey::XPub(DescriptorXKey {
+                    origin: descriptor_x_key.origin.clone(),
+                    xkey: descriptor_x_key.xkey,
+                    derivation_path: extended_path,
+                    wildcard: descriptor_x_key.wildcard,
+                });
+                Ok(Arc::new(Self {
+                    inner: extended_descriptor_public_key,
+                }))
+            }
+            BdkDescriptorPublicKey::MultiXPub(_) => Err(BdkError::Generic(
+                "Cannot derive from a multi xpub".to_string(),
+            )),
+        }
+    }
+
+    pub(crate) fn as_string(&self) -> String {
+        self.inner.to_string()
+    }
+}
+//
+// // The goal of these tests to to ensure `bdk-ffi` intermediate code correctly calls `bdk` APIs.
+// // These tests should not be used to verify `bdk` behavior that is already tested in the `bdk`
+// // crate.
+#[cfg(test)]
+mod test {
+    use crate::keys::{DerivationPath, DescriptorPublicKey, DescriptorSecretKey, Mnemonic};
+    use crate::BdkError;
+    // use bdk::bitcoin::hashes::hex::ToHex;
+    use bdk::bitcoin::Network;
+    use std::sync::Arc;
+
+    fn get_inner() -> DescriptorSecretKey {
+        let mnemonic = Mnemonic::from_string("chaos fabric time speed sponsor all flat solution wisdom trophy crack object robot pave observe combine where aware bench orient secret primary cable detect".to_string()).unwrap();
+        DescriptorSecretKey::new(Network::Testnet.into(), Arc::new(mnemonic), None)
+    }
+
+    fn derive_dsk(
+        key: &DescriptorSecretKey,
+        path: &str,
+    ) -> Result<Arc<DescriptorSecretKey>, BdkError> {
+        let path = Arc::new(DerivationPath::new(path.to_string()).unwrap());
+        key.derive(path)
+    }
+
+    fn extend_dsk(
+        key: &DescriptorSecretKey,
+        path: &str,
+    ) -> Result<Arc<DescriptorSecretKey>, BdkError> {
+        let path = Arc::new(DerivationPath::new(path.to_string()).unwrap());
+        key.extend(path)
+    }
+
+    fn derive_dpk(
+        key: &DescriptorPublicKey,
+        path: &str,
+    ) -> Result<Arc<DescriptorPublicKey>, BdkError> {
+        let path = Arc::new(DerivationPath::new(path.to_string()).unwrap());
+        key.derive(path)
+    }
+
+    fn extend_dpk(
+        key: &DescriptorPublicKey,
+        path: &str,
+    ) -> Result<Arc<DescriptorPublicKey>, BdkError> {
+        let path = Arc::new(DerivationPath::new(path.to_string()).unwrap());
+        key.extend(path)
+    }
+
+    #[test]
+    fn test_generate_descriptor_secret_key() {
+        let master_dsk = get_inner();
+        assert_eq!(master_dsk.as_string(), "tprv8ZgxMBicQKsPdWuqM1t1CDRvQtQuBPyfL6GbhQwtxDKgUAVPbxmj71pRA8raTqLrec5LyTs5TqCxdABcZr77bt2KyWA5bizJHnC4g4ysm4h/*");
+        assert_eq!(master_dsk.as_public().as_string(), "tpubD6NzVbkrYhZ4WywdEfYbbd62yuvqLjAZuPsNyvzCNV85JekAEMbKHWSHLF9h3j45SxewXDcLv328B1SEZrxg4iwGfmdt1pDFjZiTkGiFqGa/*");
+    }
+
+    #[test]
+    fn test_derive_self() {
+        let master_dsk = get_inner();
+        let derived_dsk: &DescriptorSecretKey = &derive_dsk(&master_dsk, "m").unwrap();
+        assert_eq!(derived_dsk.as_string(), "[d1d04177]tprv8ZgxMBicQKsPdWuqM1t1CDRvQtQuBPyfL6GbhQwtxDKgUAVPbxmj71pRA8raTqLrec5LyTs5TqCxdABcZr77bt2KyWA5bizJHnC4g4ysm4h/*");
+        let master_dpk: &DescriptorPublicKey = &master_dsk.as_public();
+        let derived_dpk: &DescriptorPublicKey = &derive_dpk(master_dpk, "m").unwrap();
+        assert_eq!(derived_dpk.as_string(), "[d1d04177]tpubD6NzVbkrYhZ4WywdEfYbbd62yuvqLjAZuPsNyvzCNV85JekAEMbKHWSHLF9h3j45SxewXDcLv328B1SEZrxg4iwGfmdt1pDFjZiTkGiFqGa/*");
+    }
+
+    #[test]
+    fn test_derive_descriptors_keys() {
+        let master_dsk = get_inner();
+        let derived_dsk: &DescriptorSecretKey = &derive_dsk(&master_dsk, "m/0").unwrap();
+        assert_eq!(derived_dsk.as_string(), "[d1d04177/0]tprv8d7Y4JLmD25jkKbyDZXcdoPHu1YtMHuH21qeN7mFpjfumtSU7eZimFYUCSa3MYzkEYfSNRBV34GEr2QXwZCMYRZ7M1g6PUtiLhbJhBZEGYJ/*");
+        let master_dpk: &DescriptorPublicKey = &master_dsk.as_public();
+        let derived_dpk: &DescriptorPublicKey = &derive_dpk(master_dpk, "m/0").unwrap();
+        assert_eq!(derived_dpk.as_string(), "[d1d04177/0]tpubD9oaCiP1MPmQdndm7DCD3D3QU34pWd6BbKSRedoZF1UJcNhEk3PJwkALNYkhxeTKL29oGNR7psqvT1KZydCGqUDEKXN6dVQJY2R8ooLPy8m/*");
+    }
+
+    #[test]
+    fn test_extend_descriptor_keys() {
+        let master_dsk = get_inner();
+        let extended_dsk: &DescriptorSecretKey = &extend_dsk(&master_dsk, "m/0").unwrap();
+        assert_eq!(extended_dsk.as_string(), "tprv8ZgxMBicQKsPdWuqM1t1CDRvQtQuBPyfL6GbhQwtxDKgUAVPbxmj71pRA8raTqLrec5LyTs5TqCxdABcZr77bt2KyWA5bizJHnC4g4ysm4h/0/*");
+        let master_dpk: &DescriptorPublicKey = &master_dsk.as_public();
+        let extended_dpk: &DescriptorPublicKey = &extend_dpk(master_dpk, "m/0").unwrap();
+        assert_eq!(extended_dpk.as_string(), "tpubD6NzVbkrYhZ4WywdEfYbbd62yuvqLjAZuPsNyvzCNV85JekAEMbKHWSHLF9h3j45SxewXDcLv328B1SEZrxg4iwGfmdt1pDFjZiTkGiFqGa/0/*");
+        let wif = "L2wTu6hQrnDMiFNWA5na6jB12ErGQqtXwqpSL7aWquJaZG8Ai3ch";
+        let extended_key = DescriptorSecretKey::from_string(wif.to_string()).unwrap();
+        let result = extended_key.derive(Arc::new(DerivationPath::new("m/0".to_string()).unwrap()));
+        dbg!(&result);
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn test_from_str_inner() {
+        let key1 = "L2wTu6hQrnDMiFNWA5na6jB12ErGQqtXwqpSL7aWquJaZG8Ai3ch";
+        let key2 = "tprv8ZgxMBicQKsPcwcD4gSnMti126ZiETsuX7qwrtMypr6FBwAP65puFn4v6c3jrN9VwtMRMph6nyT63NrfUL4C3nBzPcduzVSuHD7zbX2JKVc/1/1/1/*";
+        let private_descriptor_key1 = DescriptorSecretKey::from_string(key1.to_string()).unwrap();
+        let private_descriptor_key2 = DescriptorSecretKey::from_string(key2.to_string()).unwrap();
+        dbg!(private_descriptor_key1);
+        dbg!(private_descriptor_key2);
+        // Should error out because you can't produce a DescriptorSecretKey from an xpub
+        let key0 = "tpubDBrgjcxBxnXyL575sHdkpKohWu5qHKoQ7TJXKNrYznh5fVEGBv89hA8ENW7A8MFVpFUSvgLqc4Nj1WZcpePX6rrxviVtPowvMuGF5rdT2Vi";
+        assert!(DescriptorSecretKey::from_string(key0.to_string()).is_err());
+    }
+
+    #[test]
+    fn test_derive_and_extend_inner() {
+        let master_dsk = get_inner();
+        // derive DescriptorSecretKey with path "m/0" from master
+        let derived_dsk: &DescriptorSecretKey = &derive_dsk(&master_dsk, "m/0").unwrap();
+        assert_eq!(derived_dsk.as_string(), "[d1d04177/0]tprv8d7Y4JLmD25jkKbyDZXcdoPHu1YtMHuH21qeN7mFpjfumtSU7eZimFYUCSa3MYzkEYfSNRBV34GEr2QXwZCMYRZ7M1g6PUtiLhbJhBZEGYJ/*");
+        // extend derived_dsk with path "m/0"
+        let extended_dsk: &DescriptorSecretKey = &extend_dsk(derived_dsk, "m/0").unwrap();
+        assert_eq!(extended_dsk.as_string(), "[d1d04177/0]tprv8d7Y4JLmD25jkKbyDZXcdoPHu1YtMHuH21qeN7mFpjfumtSU7eZimFYUCSa3MYzkEYfSNRBV34GEr2QXwZCMYRZ7M1g6PUtiLhbJhBZEGYJ/0/*");
+    }
+
+    #[test]
+    fn test_derive_hardened_path_using_public() {
+        let master_dpk = get_inner().as_public();
+        let derived_dpk = &derive_dpk(&master_dpk, "m/84h/1h/0h");
+        assert!(derived_dpk.is_err());
+    }
+
+    // TODO 7: It appears that the to_hex() method is not available anymore.
+    //       Look into the correct way to pull the hex out of the DescriptorSecretKey.
+    //       Note: ToHex was removed in bitcoin_hashes 0.12.0
+    // #[test]
+    // fn test_retrieve_master_secret_key() {
+    //     let master_dpk = get_inner();
+    //     let master_private_key = master_dpk.secret_bytes().to_hex();
+    //     assert_eq!(
+    //         master_private_key,
+    //         "e93315d6ce401eb4db803a56232f0ed3e69b053774e6047df54f1bd00e5ea936"
+    //     )
+    // }
+}

bdk-ffi/src/lib.rs

@@ -0,0 +1,385 @@
+mod bitcoin;
+mod descriptor;
+mod esplora;
+mod keys;
+mod wallet;
+
+// TODO 6: Why are these imports required?
+use crate::bitcoin::Address;
+use crate::bitcoin::Network;
+use crate::bitcoin::OutPoint;
+use crate::bitcoin::PartiallySignedTransaction;
+use crate::bitcoin::Script;
+use crate::bitcoin::Transaction;
+use crate::descriptor::Descriptor;
+use crate::esplora::EsploraClient;
+use crate::keys::DerivationPath;
+use crate::keys::DescriptorPublicKey;
+use crate::keys::DescriptorSecretKey;
+use crate::keys::Mnemonic;
+use crate::wallet::TxBuilder;
+use crate::wallet::Update;
+use crate::wallet::Wallet;
+
+use bdk::keys::bip39::WordCount;
+use bdk::wallet::tx_builder::ChangeSpendPolicy;
+use bdk::wallet::AddressIndex as BdkAddressIndex;
+use bdk::wallet::AddressInfo as BdkAddressInfo;
+use bdk::wallet::Balance as BdkBalance;
+use bdk::Error as BdkError;
+use bdk::KeychainKind;
+
+use std::sync::Arc;
+
+uniffi::include_scaffolding!("bdk");
+
+/// A output script and an amount of satoshis.
+pub struct ScriptAmount {
+    pub script: Arc<Script>,
+    pub amount: u64,
+}
+
+/// A derived address and the index it was found at.
+pub struct AddressInfo {
+    /// Child index of this address.
+    pub index: u32,
+    /// Address.
+    pub address: Arc<Address>,
+    /// Type of keychain.
+    pub keychain: KeychainKind,
+}
+
+impl From<BdkAddressInfo> for AddressInfo {
+    fn from(address_info: BdkAddressInfo) -> Self {
+        AddressInfo {
+            index: address_info.index,
+            address: Arc::new(address_info.address.into()),
+            keychain: address_info.keychain,
+        }
+    }
+}
+
+/// The address index selection strategy to use to derived an address from the wallet's external
+/// descriptor.
+pub enum AddressIndex {
+    /// Return a new address after incrementing the current descriptor index.
+    New,
+    /// Return the address for the current descriptor index if it has not been used in a received
+    /// transaction. Otherwise return a new address as with AddressIndex::New.
+    /// Use with caution, if the wallet has not yet detected an address has been used it could
+    /// return an already used address. This function is primarily meant for situations where the
+    /// caller is untrusted; for example when deriving donation addresses on-demand for a public
+    /// web page.
+    LastUnused,
+    /// Return the address for a specific descriptor index. Does not change the current descriptor
+    /// index used by `AddressIndex::New` and `AddressIndex::LastUsed`.
+    /// Use with caution, if an index is given that is less than the current descriptor index
+    /// then the returned address may have already been used.
+    Peek { index: u32 },
+}
+
+impl From<AddressIndex> for BdkAddressIndex {
+    fn from(address_index: AddressIndex) -> Self {
+        match address_index {
+            AddressIndex::New => BdkAddressIndex::New,
+            AddressIndex::LastUnused => BdkAddressIndex::LastUnused,
+            AddressIndex::Peek { index } => BdkAddressIndex::Peek(index),
+        }
+    }
+}
+
+// TODO 9: Peek is not correctly implemented
+impl From<&AddressIndex> for BdkAddressIndex {
+    fn from(address_index: &AddressIndex) -> Self {
+        match address_index {
+            AddressIndex::New => BdkAddressIndex::New,
+            AddressIndex::LastUnused => BdkAddressIndex::LastUnused,
+            AddressIndex::Peek { index } => BdkAddressIndex::Peek(*index),
+        }
+    }
+}
+
+impl From<BdkAddressIndex> for AddressIndex {
+    fn from(address_index: BdkAddressIndex) -> Self {
+        match address_index {
+            BdkAddressIndex::New => AddressIndex::New,
+            BdkAddressIndex::LastUnused => AddressIndex::LastUnused,
+            _ => panic!("Mmmm not working"),
+        }
+    }
+}
+
+impl From<&BdkAddressIndex> for AddressIndex {
+    fn from(address_index: &BdkAddressIndex) -> Self {
+        match address_index {
+            BdkAddressIndex::New => AddressIndex::New,
+            BdkAddressIndex::LastUnused => AddressIndex::LastUnused,
+            _ => panic!("Mmmm not working"),
+        }
+    }
+}
+
+// /// A wallet transaction
+// #[derive(Debug, Clone, PartialEq, Eq, Default)]
+// pub struct TransactionDetails {
+//     pub transaction: Option<Arc<Transaction>>,
+//     /// Transaction id.
+//     pub txid: String,
+//     /// Received value (sats)
+//     /// Sum of owned outputs of this transaction.
+//     pub received: u64,
+//     /// Sent value (sats)
+//     /// Sum of owned inputs of this transaction.
+//     pub sent: u64,
+//     /// Fee value (sats) if confirmed.
+//     /// The availability of the fee depends on the backend. It's never None with an Electrum
+//     /// Server backend, but it could be None with a Bitcoin RPC node without txindex that receive
+//     /// funds while offline.
+//     pub fee: Option<u64>,
+//     /// If the transaction is confirmed, contains height and timestamp of the block containing the
+//     /// transaction, unconfirmed transaction contains `None`.
+//     pub confirmation_time: Option<BlockTime>,
+// }
+
+//
+// impl From<BdkTransactionDetails> for TransactionDetails {
+//     fn from(tx_details: BdkTransactionDetails) -> Self {
+//         let optional_tx: Option<Arc<Transaction>> =
+//             tx_details.transaction.map(|tx| Arc::new(tx.into()));
+//
+//         TransactionDetails {
+//             transaction: optional_tx,
+//             fee: tx_details.fee,
+//             txid: tx_details.txid.to_string(),
+//             received: tx_details.received,
+//             sent: tx_details.sent,
+//             confirmation_time: tx_details.confirmation_time,
+//         }
+//     }
+// }
+//
+// /// A reference to a transaction output.
+// #[derive(Clone, Debug, PartialEq, Eq, Hash)]
+// pub struct OutPoint {
+//     /// The referenced transaction's txid.
+//     txid: String,
+//     /// The index of the referenced output in its transaction's vout.
+//     vout: u32,
+// }
+//
+// impl From<&OutPoint> for BdkOutPoint {
+//     fn from(outpoint: &OutPoint) -> Self {
+//         BdkOutPoint {
+//             txid: Txid::from_str(&outpoint.txid).unwrap(),
+//             vout: outpoint.vout,
+//         }
+//     }
+// }
+
+pub struct Balance {
+    pub inner: BdkBalance,
+}
+
+impl Balance {
+    /// All coinbase outputs not yet matured.
+    fn immature(&self) -> u64 {
+        self.inner.immature
+    }
+
+    /// Unconfirmed UTXOs generated by a wallet tx.
+    fn trusted_pending(&self) -> u64 {
+        self.inner.trusted_pending
+    }
+
+    /// Unconfirmed UTXOs received from an external wallet.
+    fn untrusted_pending(&self) -> u64 {
+        self.inner.untrusted_pending
+    }
+
+    /// Confirmed and immediately spendable balance.
+    fn confirmed(&self) -> u64 {
+        self.inner.confirmed
+    }
+
+    /// Get sum of trusted_pending and confirmed coins.
+    fn trusted_spendable(&self) -> u64 {
+        self.inner.trusted_spendable()
+    }
+
+    /// Get the whole balance visible to the wallet.
+    fn total(&self) -> u64 {
+        self.inner.total()
+    }
+}
+
+// impl From<BdkBalance> for Balance {
+//     fn from(bdk_balance: BdkBalance) -> Self {
+//         Balance { inner: bdk_balance }
+//     }
+// }
+
+// /// A transaction output, which defines new coins to be created from old ones.
+// #[derive(Debug, Clone)]
+// pub struct TxOut {
+//     /// The value of the output, in satoshis.
+//     value: u64,
+//     /// The address of the output.
+//     script_pubkey: Arc<Script>,
+// }
+//
+// impl From<&BdkTxOut> for TxOut {
+//     fn from(tx_out: &BdkTxOut) -> Self {
+//         TxOut {
+//             value: tx_out.value,
+//             script_pubkey: Arc::new(Script {
+//                 inner: tx_out.script_pubkey.clone(),
+//             }),
+//         }
+//     }
+// }
+//
+// pub struct LocalUtxo {
+//     outpoint: OutPoint,
+//     txout: TxOut,
+//     keychain: KeychainKind,
+//     is_spent: bool,
+// }
+//
+// impl From<BdkLocalUtxo> for LocalUtxo {
+//     fn from(local_utxo: BdkLocalUtxo) -> Self {
+//         LocalUtxo {
+//             outpoint: OutPoint {
+//                 txid: local_utxo.outpoint.txid.to_string(),
+//                 vout: local_utxo.outpoint.vout,
+//             },
+//             txout: TxOut {
+//                 value: local_utxo.txout.value,
+//                 script_pubkey: Arc::new(Script {
+//                     inner: local_utxo.txout.script_pubkey,
+//                 }),
+//             },
+//             keychain: local_utxo.keychain,
+//             is_spent: local_utxo.is_spent,
+//         }
+//     }
+// }
+//
+// /// Trait that logs at level INFO every update received (if any).
+// pub trait Progress: Send + Sync + 'static {
+//     /// Send a new progress update. The progress value should be in the range 0.0 - 100.0, and the message value is an
+//     /// optional text message that can be displayed to the user.
+//     fn update(&self, progress: f32, message: Option<String>);
+// }
+//
+// struct ProgressHolder {
+//     progress: Box<dyn Progress>,
+// }
+//
+// impl BdkProgress for ProgressHolder {
+//     fn update(&self, progress: f32, message: Option<String>) -> Result<(), BdkError> {
+//         self.progress.update(progress, message);
+//         Ok(())
+//     }
+// }
+//
+// impl Debug for ProgressHolder {
+//     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+//         f.debug_struct("ProgressHolder").finish_non_exhaustive()
+//     }
+// }
+//
+// #[derive(Debug, Clone)]
+// pub struct TxIn {
+//     pub previous_output: OutPoint,
+//     pub script_sig: Arc<Script>,
+//     pub sequence: u32,
+//     pub witness: Vec<Vec<u8>>,
+// }
+//
+// impl From<&BdkTxIn> for TxIn {
+//     fn from(tx_in: &BdkTxIn) -> Self {
+//         TxIn {
+//             previous_output: OutPoint {
+//                 txid: tx_in.previous_output.txid.to_string(),
+//                 vout: tx_in.previous_output.vout,
+//             },
+//             script_sig: Arc::new(Script {
+//                 inner: tx_in.script_sig.clone(),
+//             }),
+//             sequence: tx_in.sequence.0,
+//             witness: tx_in.witness.to_vec(),
+//         }
+//     }
+// }
+
+// /// The method used to produce an address.
+// #[derive(Debug)]
+// pub enum Payload {
+//     /// P2PKH address.
+//     PubkeyHash { pubkey_hash: Vec<u8> },
+//     /// P2SH address.
+//     ScriptHash { script_hash: Vec<u8> },
+//     /// Segwit address.
+//     WitnessProgram {
+//         /// The witness program version.
+//         version: WitnessVersion,
+//         /// The witness program.
+//         program: Vec<u8>,
+//     },
+// }
+
+// impl From<BdkScript> for Script {
+//     fn from(bdk_script: BdkScript) -> Self {
+//         Script { inner: bdk_script }
+//     }
+// }
+//
+// #[derive(Clone, Debug)]
+// enum RbfValue {
+//     Default,
+//     Value(u32),
+// }
+//
+// /// The result after calling the TxBuilder finish() function. Contains unsigned PSBT and
+// /// transaction details.
+// pub struct TxBuilderResult {
+//     pub(crate) psbt: Arc<PartiallySignedTransaction>,
+//     pub transaction_details: TransactionDetails,
+// }
+//
+// uniffi::deps::static_assertions::assert_impl_all!(Wallet: Sync, Send);
+//
+// // The goal of these tests to to ensure `bdk-ffi` intermediate code correctly calls `bdk` APIs.
+// // These tests should not be used to verify `bdk` behavior that is already tested in the `bdk`
+// // crate.
+// #[cfg(test)]
+// mod test {
+//     use super::Transaction;
+//     use crate::Network::Regtest;
+//     use crate::{Address, Payload};
+//     use assert_matches::assert_matches;
+//     use bdk::bitcoin::hashes::hex::FromHex;
+//     use bdk::bitcoin::util::address::WitnessVersion;
+//
+//     // Verify that bdk-ffi Transaction can be created from valid bytes and serialized back into the same bytes.
+//     #[test]
+//     fn test_transaction_serde() {
+//         let test_tx_bytes = Vec::from_hex("020000000001031cfbc8f54fbfa4a33a30068841371f80dbfe166211242213188428f437445c91000000006a47304402206fbcec8d2d2e740d824d3d36cc345b37d9f65d665a99f5bd5c9e8d42270a03a8022013959632492332200c2908459547bf8dbf97c65ab1a28dec377d6f1d41d3d63e012103d7279dfb90ce17fe139ba60a7c41ddf605b25e1c07a4ddcb9dfef4e7d6710f48feffffff476222484f5e35b3f0e43f65fc76e21d8be7818dd6a989c160b1e5039b7835fc00000000171600140914414d3c94af70ac7e25407b0689e0baa10c77feffffffa83d954a62568bbc99cc644c62eb7383d7c2a2563041a0aeb891a6a4055895570000000017160014795d04cc2d4f31480d9a3710993fbd80d04301dffeffffff06fef72f000000000017a91476fd7035cd26f1a32a5ab979e056713aac25796887a5000f00000000001976a914b8332d502a529571c6af4be66399cd33379071c588ac3fda0500000000001976a914fc1d692f8de10ae33295f090bea5fe49527d975c88ac522e1b00000000001976a914808406b54d1044c429ac54c0e189b0d8061667e088ac6eb68501000000001976a914dfab6085f3a8fb3e6710206a5a959313c5618f4d88acbba20000000000001976a914eb3026552d7e3f3073457d0bee5d4757de48160d88ac0002483045022100bee24b63212939d33d513e767bc79300051f7a0d433c3fcf1e0e3bf03b9eb1d70220588dc45a9ce3a939103b4459ce47500b64e23ab118dfc03c9caa7d6bfc32b9c601210354fd80328da0f9ae6eef2b3a81f74f9a6f66761fadf96f1d1d22b1fd6845876402483045022100e29c7e3a5efc10da6269e5fc20b6a1cb8beb92130cc52c67e46ef40aaa5cac5f0220644dd1b049727d991aece98a105563416e10a5ac4221abac7d16931842d5c322012103960b87412d6e169f30e12106bdf70122aabb9eb61f455518322a18b920a4dfa887d30700").unwrap();
+//         let new_tx_from_bytes = Transaction::new(test_tx_bytes.clone()).unwrap();
+//         let serialized_tx_to_bytes = new_tx_from_bytes.serialize();
+//         assert_eq!(test_tx_bytes, serialized_tx_to_bytes);
+//     }
+//
+//     // Verify that bdk-ffi Address.payload includes expected WitnessProgram variant, version and program bytes.
+//     #[test]
+//     fn test_address_witness_program() {
+//         let address =
+//             Address::new("bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv".to_string()).unwrap();
+//         let payload = address.payload();
+//         assert_matches!(payload, Payload::WitnessProgram { version, program } => {
+//             assert_eq!(version,WitnessVersion::V0);
+//             assert_eq!(program, Vec::from_hex("04a6545885dd87b8e147cd327f2e9db362b72346").unwrap());
+//         });
+//         assert_eq!(address.network(), Regtest);
+//     }
+// }

bdk-ffi/src/wallet.rs

@@ -0,0 +1,910 @@
+use crate::bitcoin::{OutPoint, PartiallySignedTransaction};
+use crate::descriptor::Descriptor;
+use crate::{AddressIndex, AddressInfo, Network, ScriptAmount};
+use crate::{Balance, Script};
+use std::collections::HashSet;
+
+use bdk::bitcoin::blockdata::script::ScriptBuf as BdkScriptBuf;
+use bdk::bitcoin::OutPoint as BdkOutPoint;
+use bdk::wallet::Update as BdkUpdate;
+use bdk::{Error as BdkError, FeeRate};
+use bdk::{SignOptions, Wallet as BdkWallet};
+
+use bdk::wallet::tx_builder::ChangeSpendPolicy;
+use std::sync::{Arc, Mutex, MutexGuard};
+
+#[derive(Debug)]
+pub struct Wallet {
+    // TODO 8: Do we really need the mutex on the wallet? Could this be an Arc?
+    inner_mutex: Mutex<BdkWallet>,
+}
+
+impl Wallet {
+    pub fn new_no_persist(
+        descriptor: Arc<Descriptor>,
+        change_descriptor: Option<Arc<Descriptor>>,
+        network: Network,
+    ) -> Result<Self, BdkError> {
+        let descriptor = descriptor.as_string_private();
+        let change_descriptor = change_descriptor.map(|d| d.as_string_private());
+
+        let wallet =
+            BdkWallet::new_no_persist(&descriptor, change_descriptor.as_ref(), network.into())?;
+
+        Ok(Wallet {
+            inner_mutex: Mutex::new(wallet),
+        })
+    }
+
+    // TODO 10: Do we need this mutex
+    pub(crate) fn get_wallet(&self) -> MutexGuard<BdkWallet> {
+        self.inner_mutex.lock().expect("wallet")
+    }
+
+    pub fn get_address(&self, address_index: AddressIndex) -> AddressInfo {
+        self.get_wallet().get_address(address_index.into()).into()
+    }
+
+    pub fn network(&self) -> Network {
+        self.get_wallet().network().into()
+    }
+
+    pub fn get_internal_address(&self, address_index: AddressIndex) -> AddressInfo {
+        self.get_wallet()
+            .get_internal_address(address_index.into())
+            .into()
+    }
+
+    // TODO 16: Why is the Arc required here?
+    pub fn get_balance(&self) -> Arc<Balance> {
+        let bdk_balance = self.get_wallet().get_balance();
+        let balance = Balance { inner: bdk_balance };
+        Arc::new(balance)
+    }
+
+    pub fn apply_update(&self, update: Arc<Update>) -> Result<(), BdkError> {
+        self.get_wallet()
+            .apply_update(update.0.clone())
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+
+    pub fn is_mine(&self, script: Arc<Script>) -> bool {
+        // TODO: Both of the following lines work. Which is better?
+        self.get_wallet().is_mine(&script.0)
+        // self.get_wallet().is_mine(script.0.clone().as_script())
+    }
+
+    /// Sign a transaction with all the wallet's signers, in the order specified by every signer's
+    /// [`SignerOrdering`]. This function returns the `Result` type with an encapsulated `bool` that
+    /// has the value true if the PSBT was finalized, or false otherwise.
+    ///
+    /// The [`SignOptions`] can be used to tweak the behavior of the software signers, and the way
+    /// the transaction is finalized at the end. Note that it can't be guaranteed that *every*
+    /// signers will follow the options, but the "software signers" (WIF keys and `xprv`) defined
+    /// in this library will.
+    pub(crate) fn sign(
+        &self,
+        psbt: Arc<PartiallySignedTransaction>,
+        // sign_options: Option<SignOptions>,
+    ) -> Result<bool, BdkError> {
+        let mut psbt = psbt.inner.lock().unwrap();
+        self.get_wallet()
+            .sign(&mut psbt, SignOptions::default())
+            .map_err(|e| BdkError::Generic(e.to_string()))
+    }
+}
+
+pub struct Update(pub(crate) BdkUpdate);
+
+// /// A Bitcoin wallet.
+// /// The Wallet acts as a way of coherently interfacing with output descriptors and related transactions. Its main components are:
+// ///     1. Output descriptors from which it can derive addresses.
+// ///     2. A Database where it tracks transactions and utxos related to the descriptors.
+// ///     3. Signers that can contribute signatures to addresses instantiated from the descriptors.
+// impl Wallet {
+//     pub fn new(
+//         descriptor: Arc<Descriptor>,
+//         change_descriptor: Option<Arc<Descriptor>>,
+//         network: Network,
+//     ) -> Result<Self, BdkError> {
+//         let wallet = BdkWallet::new_no_persist()?;
+//         Ok(Wallet {
+//             inner: wallet,
+//         })
+//     }
+// }
+
+//     /// Return whether or not a script is part of this wallet (either internal or external).
+//     pub(crate) fn is_mine(&self, script: Arc<Script>) -> bool {
+//         self.inner.is_mine(&script.inner)
+//     }
+//
+//     /// Sync the internal database with the blockchain.
+//     // pub(crate) fn sync(
+//     //     &self,
+//     //     blockchain: &Blockchain,
+//     //     progress: Option<Box<dyn Progress>>,
+//     // ) -> Result<(), BdkError> {
+//     //     let bdk_sync_opts = BdkSyncOptions {
+//     //         progress: progress.map(|p| {
+//     //             Box::new(ProgressHolder { progress: p })
+//     //                 as Box<(dyn bdk::blockchain::Progress + 'static)>
+//     //         }),
+//     //     };
+//     //
+//     //     let blockchain = blockchain.get_blockchain();
+//     //     self.get_wallet().sync(blockchain.deref(), bdk_sync_opts)
+//     // }
+//
+//     /// Return a derived address using the external descriptor, see AddressIndex for available address index selection
+//     /// strategies. If none of the keys in the descriptor are derivable (i.e. the descriptor does not end with a * character)
+//     /// then the same address will always be returned for any AddressIndex.
+//     /// MIGRATION 1.0: The wallet needs to be mutated for this method to work... does that mean I should bring back the Mutex?
+//     ///                Is this thread-safe?
+//     pub(crate) fn get_address(&mut self, address_index: AddressIndex) -> AddressInfo {
+//         AddressInfo::from(self.inner.get_address(address_index.into()))
+//     }
+//
+//     /// Return a derived address using the internal (change) descriptor.
+//     ///
+//     /// If the wallet doesn't have an internal descriptor it will use the external descriptor.
+//     ///
+//     /// see [`AddressIndex`] for available address index selection strategies. If none of the keys
+//     /// in the descriptor are derivable (i.e. does not end with /*) then the same address will always
+//     /// be returned for any [`AddressIndex`].
+//     pub(crate) fn get_internal_address(&mut self, address_index: AddressIndex, ) -> AddressInfo {
+//         AddressInfo::from(self.inner.get_internal_address(address_index.into()))
+//     }
+//
+//     /// Return the balance, meaning the sum of this wallet’s unspent outputs’ values. Note that this method only operates
+//     /// on the internal database, which first needs to be Wallet.sync manually.
+//     pub(crate) fn get_balance(&self) -> Balance {
+//         Balance::from(self.inner.get_balance())
+//     }
+//
+//     /// Sign a transaction with all the wallet's signers, in the order specified by every signer's
+//     /// [`SignerOrdering`]. This function returns the `Result` type with an encapsulated `bool` that
+//     /// has the value true if the PSBT was finalized, or false otherwise.
+//     ///
+//     /// The [`SignOptions`] can be used to tweak the behavior of the software signers, and the way
+//     /// the transaction is finalized at the end. Note that it can't be guaranteed that *every*
+//     /// signers will follow the options, but the "software signers" (WIF keys and `xprv`) defined
+//     /// in this library will.
+//     pub(crate) fn sign(
+//         &self,
+//         psbt: &PartiallySignedTransaction,
+//         sign_options: Option<SignOptions>,
+//     ) -> Result<bool, BdkError> {
+//         let mut psbt = psbt.inner.lock().unwrap();
+//         self.inner.sign(
+//             &mut psbt,
+//             sign_options.map(SignOptions::into).unwrap_or_default(),
+//         )
+//     }
+//
+//     /// Return the list of transactions made and received by the wallet. Note that this method only operate on the internal database, which first needs to be [Wallet.sync] manually.
+//     pub(crate) fn list_transactions(
+//         &self,
+//         include_raw: bool,
+//     ) -> Result<Vec<TransactionDetails>, BdkError> {
+//         let transaction_details = self.inner.list_transactions(include_raw)?;
+//         Ok(transaction_details
+//             .into_iter()
+//             .map(TransactionDetails::from)
+//             .collect())
+//     }
+//
+//     /// Return the list of unspent outputs of this wallet. Note that this method only operates on the internal database,
+//     /// which first needs to be Wallet.sync manually.
+//     pub(crate) fn list_unspent(&self) -> Result<Vec<LocalUtxo>, BdkError> {
+//         let unspents: Vec<BdkLocalUtxo> = self.inner.list_unspent()?;
+//         Ok(unspents.into_iter().map(LocalUtxo::from).collect())
+//     }
+// }
+//
+// /// Options for a software signer
+// ///
+// /// Adjust the behavior of our software signers and the way a transaction is finalized
+// #[derive(Debug, Clone, Default)]
+// pub struct SignOptions {
+//     /// Whether the signer should trust the `witness_utxo`, if the `non_witness_utxo` hasn't been
+//     /// provided
+//     ///
+//     /// Defaults to `false` to mitigate the "SegWit bug" which should trick the wallet into
+//     /// paying a fee larger than expected.
+//     ///
+//     /// Some wallets, especially if relatively old, might not provide the `non_witness_utxo` for
+//     /// SegWit transactions in the PSBT they generate: in those cases setting this to `true`
+//     /// should correctly produce a signature, at the expense of an increased trust in the creator
+//     /// of the PSBT.
+//     ///
+//     /// For more details see: <https://blog.trezor.io/details-of-firmware-updates-for-trezor-one-version-1-9-1-and-trezor-model-t-version-2-3-1-1eba8f60f2dd>
+//     pub trust_witness_utxo: bool,
+//
+//     /// Whether the wallet should assume a specific height has been reached when trying to finalize
+//     /// a transaction
+//     ///
+//     /// The wallet will only "use" a timelock to satisfy the spending policy of an input if the
+//     /// timelock height has already been reached. This option allows overriding the "current height" to let the
+//     /// wallet use timelocks in the future to spend a coin.
+//     pub assume_height: Option<u32>,
+//
+//     /// Whether the signer should use the `sighash_type` set in the PSBT when signing, no matter
+//     /// what its value is
+//     ///
+//     /// Defaults to `false` which will only allow signing using `SIGHASH_ALL`.
+//     pub allow_all_sighashes: bool,
+//
+//     /// Whether to remove partial signatures from the PSBT inputs while finalizing PSBT.
+//     ///
+//     /// Defaults to `true` which will remove partial signatures during finalization.
+//     pub remove_partial_sigs: bool,
+//
+//     /// Whether to try finalizing the PSBT after the inputs are signed.
+//     ///
+//     /// Defaults to `true` which will try finalizing PSBT after inputs are signed.
+//     pub try_finalize: bool,
+//
+//     // Specifies which Taproot script-spend leaves we should sign for. This option is
+//     // ignored if we're signing a non-taproot PSBT.
+//     //
+//     // Defaults to All, i.e., the wallet will sign all the leaves it has a key for.
+//     // TODO pub tap_leaves_options: TapLeavesOptions,
+//     /// Whether we should try to sign a taproot transaction with the taproot internal key
+//     /// or not. This option is ignored if we're signing a non-taproot PSBT.
+//     ///
+//     /// Defaults to `true`, i.e., we always try to sign with the taproot internal key.
+//     pub sign_with_tap_internal_key: bool,
+//
+//     /// Whether we should grind ECDSA signature to ensure signing with low r
+//     /// or not.
+//     /// Defaults to `true`, i.e., we always grind ECDSA signature to sign with low r.
+//     pub allow_grinding: bool,
+// }
+//
+// impl From<SignOptions> for BdkSignOptions {
+//     fn from(sign_options: SignOptions) -> Self {
+//         BdkSignOptions {
+//             trust_witness_utxo: sign_options.trust_witness_utxo,
+//             assume_height: sign_options.assume_height,
+//             allow_all_sighashes: sign_options.allow_all_sighashes,
+//             remove_partial_sigs: sign_options.remove_partial_sigs,
+//             try_finalize: sign_options.try_finalize,
+//             tap_leaves_options: Default::default(),
+//             sign_with_tap_internal_key: sign_options.sign_with_tap_internal_key,
+//             allow_grinding: sign_options.allow_grinding,
+//         }
+//     }
+// }
+//
+/// A transaction builder.
+/// After creating the TxBuilder, you set options on it until finally calling finish to consume the builder and generate the transaction.
+/// Each method on the TxBuilder returns an instance of a new TxBuilder with the option set/added.
+#[derive(Clone, Debug)]
+pub struct TxBuilder {
+    pub(crate) recipients: Vec<(BdkScriptBuf, u64)>,
+    pub(crate) utxos: Vec<OutPoint>,
+    pub(crate) unspendable: HashSet<OutPoint>,
+    pub(crate) change_policy: ChangeSpendPolicy,
+    pub(crate) manually_selected_only: bool,
+    pub(crate) fee_rate: Option<f32>,
+    // pub(crate) fee_absolute: Option<u64>,
+    pub(crate) drain_wallet: bool,
+    // pub(crate) drain_to: Option<BdkScript>,
+    // pub(crate) rbf: Option<RbfValue>,
+    // pub(crate) data: Vec<u8>,
+}
+
+impl TxBuilder {
+    pub(crate) fn new() -> Self {
+        TxBuilder {
+            recipients: Vec::new(),
+            utxos: Vec::new(),
+            unspendable: HashSet::new(),
+            change_policy: ChangeSpendPolicy::ChangeAllowed,
+            manually_selected_only: false,
+            fee_rate: None,
+            // fee_absolute: None,
+            drain_wallet: false,
+            // drain_to: None,
+            // rbf: None,
+            // data: Vec::new(),
+        }
+    }
+
+    /// Add a recipient to the internal list.
+    pub(crate) fn add_recipient(&self, script: Arc<Script>, amount: u64) -> Arc<Self> {
+        let mut recipients: Vec<(BdkScriptBuf, u64)> = self.recipients.clone();
+        recipients.append(&mut vec![(script.0.clone(), amount)]);
+
+        Arc::new(TxBuilder {
+            recipients,
+            ..self.clone()
+        })
+    }
+
+    pub(crate) fn set_recipients(&self, recipients: Vec<ScriptAmount>) -> Arc<Self> {
+        let recipients = recipients
+            .iter()
+            .map(|script_amount| (script_amount.script.0.clone(), script_amount.amount))
+            .collect();
+        Arc::new(TxBuilder {
+            recipients,
+            ..self.clone()
+        })
+    }
+
+    /// Add a utxo to the internal list of unspendable utxos. It’s important to note that the "must-be-spent"
+    /// utxos added with [TxBuilder.addUtxo] have priority over this. See the Rust docs of the two linked methods for more details.
+    pub(crate) fn add_unspendable(&self, unspendable: OutPoint) -> Arc<Self> {
+        let mut unspendable_hash_set = self.unspendable.clone();
+        unspendable_hash_set.insert(unspendable);
+        Arc::new(TxBuilder {
+            unspendable: unspendable_hash_set,
+            ..self.clone()
+        })
+    }
+
+    /// Add an outpoint to the internal list of UTXOs that must be spent. These have priority over the "unspendable"
+    /// utxos, meaning that if a utxo is present both in the "utxos" and the "unspendable" list, it will be spent.
+    pub(crate) fn add_utxo(&self, outpoint: OutPoint) -> Arc<Self> {
+        self.add_utxos(vec![outpoint])
+    }
+
+    /// Add the list of outpoints to the internal list of UTXOs that must be spent. If an error occurs while adding
+    /// any of the UTXOs then none of them are added and the error is returned. These have priority over the "unspendable"
+    /// utxos, meaning that if a utxo is present both in the "utxos" and the "unspendable" list, it will be spent.
+    pub(crate) fn add_utxos(&self, mut outpoints: Vec<OutPoint>) -> Arc<Self> {
+        let mut utxos = self.utxos.to_vec();
+        utxos.append(&mut outpoints);
+        Arc::new(TxBuilder {
+            utxos,
+            ..self.clone()
+        })
+    }
+
+    pub(crate) fn change_policy(&self, change_policy: ChangeSpendPolicy) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            change_policy,
+            ..self.clone()
+        })
+    }
+
+    /// Do not spend change outputs. This effectively adds all the change outputs to the "unspendable" list. See TxBuilder.unspendable.
+    pub(crate) fn do_not_spend_change(&self) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            change_policy: ChangeSpendPolicy::ChangeForbidden,
+            ..self.clone()
+        })
+    }
+
+    /// Only spend change outputs. This effectively adds all the non-change outputs to the "unspendable" list. See TxBuilder.unspendable.
+    pub(crate) fn only_spend_change(&self) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            change_policy: ChangeSpendPolicy::OnlyChange,
+            ..self.clone()
+        })
+    }
+
+    /// Only spend utxos added by [add_utxo]. The wallet will not add additional utxos to the transaction even if they are
+    /// needed to make the transaction valid.
+    pub(crate) fn manually_selected_only(&self) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            manually_selected_only: true,
+            ..self.clone()
+        })
+    }
+
+    //     /// Replace the internal list of unspendable utxos with a new list. It’s important to note that the "must-be-spent" utxos added with
+    //     /// TxBuilder.addUtxo have priority over these. See the Rust docs of the two linked methods for more details.
+    //     pub(crate) fn unspendable(&self, unspendable: Vec<OutPoint>) -> Arc<Self> {
+    //         Arc::new(TxBuilder {
+    //             unspendable: unspendable.into_iter().collect(),
+    //             ..self.clone()
+    //         })
+    //     }
+
+    /// Set a custom fee rate.
+    pub(crate) fn fee_rate(&self, sat_per_vb: f32) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            fee_rate: Some(sat_per_vb),
+            ..self.clone()
+        })
+    }
+
+    //     /// Set an absolute fee.
+    //     pub(crate) fn fee_absolute(&self, fee_amount: u64) -> Arc<Self> {
+    //         Arc::new(TxBuilder {
+    //             fee_absolute: Some(fee_amount),
+    //             ..self.clone()
+    //         })
+    //     }
+
+    /// Spend all the available inputs. This respects filters like TxBuilder.unspendable and the change policy.
+    pub(crate) fn drain_wallet(&self) -> Arc<Self> {
+        Arc::new(TxBuilder {
+            drain_wallet: true,
+            ..self.clone()
+        })
+    }
+
+    //     /// Sets the address to drain excess coins to. Usually, when there are excess coins they are sent to a change address
+    //     /// generated by the wallet. This option replaces the usual change address with an arbitrary ScriptPubKey of your choosing.
+    //     /// Just as with a change output, if the drain output is not needed (the excess coins are too small) it will not be included
+    //     /// in the resulting transaction. The only difference is that it is valid to use drain_to without setting any ordinary recipients
+    //     /// with add_recipient (but it is perfectly fine to add recipients as well). If you choose not to set any recipients, you should
+    //     /// either provide the utxos that the transaction should spend via add_utxos, or set drain_wallet to spend all of them.
+    //     /// When bumping the fees of a transaction made with this option, you probably want to use BumpFeeTxBuilder.allow_shrinking
+    //     /// to allow this output to be reduced to pay for the extra fees.
+    //     pub(crate) fn drain_to(&self, script: Arc<Script>) -> Arc<Self> {
+    //         Arc::new(TxBuilder {
+    //             drain_to: Some(script.inner.clone()),
+    //             ..self.clone()
+    //         })
+    //     }
+    //
+    //     /// Enable signaling RBF. This will use the default `nsequence` value of `0xFFFFFFFD`.
+    //     pub(crate) fn enable_rbf(&self) -> Arc<Self> {
+    //         Arc::new(TxBuilder {
+    //             rbf: Some(RbfValue::Default),
+    //             ..self.clone()
+    //         })
+    //     }
+    //
+    //     /// Enable signaling RBF with a specific nSequence value. This can cause conflicts if the wallet's descriptors contain an
+    //     /// "older" (OP_CSV) operator and the given `nsequence` is lower than the CSV value. If the `nsequence` is higher than `0xFFFFFFFD`
+    //     /// an error will be thrown, since it would not be a valid nSequence to signal RBF.
+    //     pub(crate) fn enable_rbf_with_sequence(&self, nsequence: u32) -> Arc<Self> {
+    //         Arc::new(TxBuilder {
+    //             rbf: Some(RbfValue::Value(nsequence)),
+    //             ..self.clone()
+    //         })
+    //     }
+
+    /// Add data as an output using OP_RETURN.
+    // pub(crate) fn add_data(&self, data: Vec<u8>) -> Arc<Self> {
+    //     Arc::new(TxBuilder {
+    //         data,
+    //         ..self.clone()
+    //     })
+    // }
+
+    /// Finish building the transaction. Returns the BIP174 PSBT.
+    pub(crate) fn finish(
+        &self,
+        wallet: &Wallet,
+    ) -> Result<Arc<PartiallySignedTransaction>, BdkError> {
+        // TODO: I had to change the wallet here to be mutable. Why is that now required with the 1.0 API?
+        let mut wallet = wallet.get_wallet();
+        let mut tx_builder = wallet.build_tx();
+        for (script, amount) in &self.recipients {
+            tx_builder.add_recipient(script.clone(), *amount);
+        }
+        tx_builder.change_policy(self.change_policy);
+        if !self.utxos.is_empty() {
+            let bdk_utxos: Vec<BdkOutPoint> = self.utxos.iter().map(BdkOutPoint::from).collect();
+            let utxos: &[BdkOutPoint] = &bdk_utxos;
+            tx_builder.add_utxos(utxos)?;
+        }
+        // if !self.unspendable.is_empty() {
+        //     let bdk_unspendable: Vec<BdkOutPoint> =
+        //         self.unspendable.iter().map(BdkOutPoint::from).collect();
+        //     tx_builder.unspendable(bdk_unspendable);
+        // }
+        if self.manually_selected_only {
+            tx_builder.manually_selected_only();
+        }
+        if let Some(sat_per_vb) = self.fee_rate {
+            tx_builder.fee_rate(FeeRate::from_sat_per_vb(sat_per_vb));
+        }
+        // if let Some(fee_amount) = self.fee_absolute {
+        //     tx_builder.fee_absolute(fee_amount);
+        // }
+        if self.drain_wallet {
+            tx_builder.drain_wallet();
+        }
+        // if let Some(script) = &self.drain_to {
+        //     tx_builder.drain_to(script.clone());
+        // }
+        // if let Some(rbf) = &self.rbf {
+        //     match *rbf {
+        //         RbfValue::Default => {
+        //             tx_builder.enable_rbf();
+        //         }
+        //         RbfValue::Value(nsequence) => {
+        //             tx_builder.enable_rbf_with_sequence(Sequence(nsequence));
+        //         }
+        //     }
+        // }
+        // if !&self.data.is_empty() {
+        //     tx_builder.add_data(self.data.as_slice());
+        // }
+
+        // tx_builder.finish().map(|psbt| psbt.serialize_hex())
+        // tx_builder.finish().into()
+        let psbt = tx_builder.finish()?;
+
+        Ok(Arc::new(psbt.into()))
+    }
+}
+
+// /// The BumpFeeTxBuilder is used to bump the fee on a transaction that has been broadcast and has its RBF flag set to true.
+// #[derive(Clone)]
+// pub(crate) struct BumpFeeTxBuilder {
+//     pub(crate) txid: String,
+//     pub(crate) fee_rate: f32,
+//     pub(crate) allow_shrinking: Option<String>,
+//     pub(crate) rbf: Option<RbfValue>,
+// }
+//
+// impl BumpFeeTxBuilder {
+//     pub(crate) fn new(txid: String, fee_rate: f32) -> Self {
+//         Self {
+//             txid,
+//             fee_rate,
+//             allow_shrinking: None,
+//             rbf: None,
+//         }
+//     }
+//
+//     /// Explicitly tells the wallet that it is allowed to reduce the amount of the output matching this script_pubkey
+//     /// in order to bump the transaction fee. Without specifying this the wallet will attempt to find a change output to
+//     /// shrink instead. Note that the output may shrink to below the dust limit and therefore be removed. If it is preserved
+//     /// then it is currently not guaranteed to be in the same position as it was originally. Returns an error if script_pubkey
+//     /// can’t be found among the recipients of the transaction we are bumping.
+//     pub(crate) fn allow_shrinking(&self, address: String) -> Arc<Self> {
+//         Arc::new(Self {
+//             allow_shrinking: Some(address),
+//             ..self.clone()
+//         })
+//     }
+//
+//     /// Enable signaling RBF. This will use the default `nsequence` value of `0xFFFFFFFD`.
+//     pub(crate) fn enable_rbf(&self) -> Arc<Self> {
+//         Arc::new(Self {
+//             rbf: Some(RbfValue::Default),
+//             ..self.clone()
+//         })
+//     }
+//
+//     /// Enable signaling RBF with a specific nSequence value. This can cause conflicts if the wallet's descriptors contain an
+//     /// "older" (OP_CSV) operator and the given `nsequence` is lower than the CSV value. If the `nsequence` is higher than `0xFFFFFFFD`
+//     /// an error will be thrown, since it would not be a valid nSequence to signal RBF.
+//     pub(crate) fn enable_rbf_with_sequence(&self, nsequence: u32) -> Arc<Self> {
+//         Arc::new(Self {
+//             rbf: Some(RbfValue::Value(nsequence)),
+//             ..self.clone()
+//         })
+//     }
+//
+//     /// Finish building the transaction. Returns the BIP174 PSBT.
+//     pub(crate) fn finish(
+//         &self,
+//         wallet: &Wallet,
+//     ) -> Result<Arc<PartiallySignedTransaction>, BdkError> {
+//         let wallet = wallet.get_wallet();
+//         let txid = Txid::from_str(self.txid.as_str())?;
+//         let mut tx_builder = wallet.build_fee_bump(txid)?;
+//         tx_builder.fee_rate(FeeRate::from_sat_per_vb(self.fee_rate));
+//         if let Some(allow_shrinking) = &self.allow_shrinking {
+//             let address = BdkAddress::from_str(allow_shrinking)
+//                 .map_err(|e| BdkError::Generic(e.to_string()))?;
+//             let script = address.script_pubkey();
+//             tx_builder.allow_shrinking(script)?;
+//         }
+//         if let Some(rbf) = &self.rbf {
+//             match *rbf {
+//                 RbfValue::Default => {
+//                     tx_builder.enable_rbf();
+//                 }
+//                 RbfValue::Value(nsequence) => {
+//                     tx_builder.enable_rbf_with_sequence(Sequence(nsequence));
+//                 }
+//             }
+//         }
+//         tx_builder
+//             .finish()
+//             .map(|(psbt, _)| PartiallySignedTransaction {
+//                 inner: Mutex::new(psbt),
+//             })
+//             .map(Arc::new)
+//     }
+// }
+
+// // The goal of these tests to to ensure `bdk-ffi` intermediate code correctly calls `bdk` APIs.
+// // These tests should not be used to verify `bdk` behavior that is already tested in the `bdk`
+// // crate.
+// #[cfg(test)]
+// mod test {
+//     use crate::database::DatabaseConfig;
+//     use crate::descriptor::Descriptor;
+//     use crate::keys::{DescriptorSecretKey, Mnemonic};
+//     use crate::wallet::{AddressIndex, TxBuilder, Wallet};
+//     use crate::Script;
+//     use assert_matches::assert_matches;
+//     use bdk::bitcoin::{Address, Network};
+//     // use bdk::wallet::get_funded_wallet;
+//     use bdk::KeychainKind;
+//     use std::str::FromStr;
+//     use std::sync::{Arc, Mutex};
+//
+//     // #[test]
+//     // fn test_drain_wallet() {
+//     //     let test_wpkh = "wpkh(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW)";
+//     //     let (funded_wallet, _, _) = get_funded_wallet(test_wpkh);
+//     //     let test_wallet = Wallet {
+//     //         inner_mutex: Mutex::new(funded_wallet),
+//     //     };
+//     //     let drain_to_address = "tb1ql7w62elx9ucw4pj5lgw4l028hmuw80sndtntxt".to_string();
+//     //     let drain_to_script = crate::Address::new(drain_to_address)
+//     //         .unwrap()
+//     //         .script_pubkey();
+//     //     let tx_builder = TxBuilder::new()
+//     //         .drain_wallet()
+//     //         .drain_to(drain_to_script.clone());
+//     //     assert!(tx_builder.drain_wallet);
+//     //     assert_eq!(tx_builder.drain_to, Some(drain_to_script.inner.clone()));
+//     //
+//     //     let tx_builder_result = tx_builder.finish(&test_wallet).unwrap();
+//     //     let psbt = tx_builder_result.psbt.inner.lock().unwrap().clone();
+//     //     let tx_details = tx_builder_result.transaction_details;
+//     //
+//     //     // confirm one input with 50,000 sats
+//     //     assert_eq!(psbt.inputs.len(), 1);
+//     //     let input_value = psbt
+//     //         .inputs
+//     //         .get(0)
+//     //         .cloned()
+//     //         .unwrap()
+//     //         .non_witness_utxo
+//     //         .unwrap()
+//     //         .output
+//     //         .get(0)
+//     //         .unwrap()
+//     //         .value;
+//     //     assert_eq!(input_value, 50_000_u64);
+//     //
+//     //     // confirm one output to correct address with all sats - fee
+//     //     assert_eq!(psbt.outputs.len(), 1);
+//     //     let output_address = Address::from_script(
+//     //         &psbt
+//     //             .unsigned_tx
+//     //             .output
+//     //             .get(0)
+//     //             .cloned()
+//     //             .unwrap()
+//     //             .script_pubkey,
+//     //         Network::Testnet,
+//     //     )
+//     //     .unwrap();
+//     //     assert_eq!(
+//     //         output_address,
+//     //         Address::from_str("tb1ql7w62elx9ucw4pj5lgw4l028hmuw80sndtntxt").unwrap()
+//     //     );
+//     //     let output_value = psbt.unsigned_tx.output.get(0).cloned().unwrap().value;
+//     //     assert_eq!(output_value, 49_890_u64); // input - fee
+//     //
+//     //     assert_eq!(
+//     //         tx_details.txid,
+//     //         "312f1733badab22dc26b8dcbc83ba5629fb7b493af802e8abe07d865e49629c5"
+//     //     );
+//     //     assert_eq!(tx_details.received, 0);
+//     //     assert_eq!(tx_details.sent, 50000);
+//     //     assert!(tx_details.fee.is_some());
+//     //     assert_eq!(tx_details.fee.unwrap(), 110);
+//     //     assert!(tx_details.confirmation_time.is_none());
+//     // }
+//
+//     #[test]
+//     fn test_peek_reset_address() {
+//         let test_wpkh = "wpkh(tprv8hwWMmPE4BVNxGdVt3HhEERZhondQvodUY7Ajyseyhudr4WabJqWKWLr4Wi2r26CDaNCQhhxEftEaNzz7dPGhWuKFU4VULesmhEfZYyBXdE/0/*)";
+//         let descriptor = Descriptor::new(test_wpkh.to_string(), Network::Regtest).unwrap();
+//         let change_descriptor = Descriptor::new(
+//             test_wpkh.to_string().replace("/0/*", "/1/*"),
+//             Network::Regtest,
+//         )
+//         .unwrap();
+//
+//         let wallet = Wallet::new(
+//             Arc::new(descriptor),
+//             Some(Arc::new(change_descriptor)),
+//             Network::Regtest,
+//             DatabaseConfig::Memory,
+//         )
+//         .unwrap();
+//
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::Peek { index: 2 })
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q5g0mq6dkmwzvxscqwgc932jhgcxuqqkjv09tkj"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::Peek { index: 1 })
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//
+//         // new index still 0
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv"
+//         );
+//
+//         // new index now 1
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//
+//         // new index now 2
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q5g0mq6dkmwzvxscqwgc932jhgcxuqqkjv09tkj"
+//         );
+//
+//         // peek index 1
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::Peek { index: 1 })
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//
+//         // reset to index 0
+//         // assert_eq!(
+//         //     wallet
+//         //         .get_address(AddressIndex::Reset { index: 0 })
+//         //         .unwrap()
+//         //         .address
+//         //         .as_string(),
+//         //     "bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv"
+//         // );
+//
+//         // new index 1 again
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//     }
+//
+//     #[test]
+//     fn test_get_address() {
+//         let test_wpkh = "wpkh(tprv8hwWMmPE4BVNxGdVt3HhEERZhondQvodUY7Ajyseyhudr4WabJqWKWLr4Wi2r26CDaNCQhhxEftEaNzz7dPGhWuKFU4VULesmhEfZYyBXdE/0/*)";
+//         let descriptor = Descriptor::new(test_wpkh.to_string(), Network::Regtest).unwrap();
+//         let change_descriptor = Descriptor::new(
+//             test_wpkh.to_string().replace("/0/*", "/1/*"),
+//             Network::Regtest,
+//         )
+//         .unwrap();
+//
+//         let wallet = Wallet::new(
+//             Arc::new(descriptor),
+//             Some(Arc::new(change_descriptor)),
+//             Network::Regtest,
+//             DatabaseConfig::Memory,
+//         )
+//         .unwrap();
+//
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_address(AddressIndex::LastUnused)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1q0xs7dau8af22rspp4klya4f7lhggcnqfun2y3a"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_internal_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1qpmz73cyx00r4a5dea469j40ax6d6kqyd67nnpj"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_internal_address(AddressIndex::New)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1qaux734vuhykww9632v8cmdnk7z2mw5lsf74v6k"
+//         );
+//
+//         assert_eq!(
+//             wallet
+//                 .get_internal_address(AddressIndex::LastUnused)
+//                 .unwrap()
+//                 .address
+//                 .as_string(),
+//             "bcrt1qaux734vuhykww9632v8cmdnk7z2mw5lsf74v6k"
+//         );
+//     }
+//
+//     #[test]
+//     fn test_is_mine() {
+//         // is_mine should return true for addresses generated by the wallet
+//         let mnemonic: Mnemonic = Mnemonic::from_string("chaos fabric time speed sponsor all flat solution wisdom trophy crack object robot pave observe combine where aware bench orient secret primary cable detect".to_string()).unwrap();
+//         let secret_key: DescriptorSecretKey =
+//             DescriptorSecretKey::new(Network::Testnet, Arc::new(mnemonic), None);
+//         let descriptor: Descriptor = Descriptor::new_bip84(
+//             Arc::new(secret_key),
+//             KeychainKind::External,
+//             Network::Testnet,
+//         );
+//         let wallet: Wallet = Wallet::new(
+//             Arc::new(descriptor),
+//             None,
+//             Network::Testnet,
+//             DatabaseConfig::Memory,
+//         )
+//         .unwrap();
+//
+//         // let address = wallet.get_address(AddressIndex::New).unwrap();
+//         // let script: Arc<Script> = address.address.script_pubkey();
+//
+//         // let is_mine_1: bool = wallet.is_mine(script).unwrap();
+//         // assert!(is_mine_1);
+//
+//         // is_mine returns false when provided a script that is not in the wallet
+//         let other_wpkh = "wpkh(tprv8hwWMmPE4BVNxGdVt3HhEERZhondQvodUY7Ajyseyhudr4WabJqWKWLr4Wi2r26CDaNCQhhxEftEaNzz7dPGhWuKFU4VULesmhEfZYyBXdE/0/*)";
+//         let other_descriptor = Descriptor::new(other_wpkh.to_string(), Network::Testnet).unwrap();
+//
+//         let other_wallet = Wallet::new(
+//             Arc::new(other_descriptor),
+//             None,
+//             Network::Testnet,
+//             DatabaseConfig::Memory,
+//         )
+//         .unwrap();
+//
+//         let other_address = other_wallet.get_address(AddressIndex::New).unwrap();
+//         let other_script: Arc<Script> = other_address.address.script_pubkey();
+//         let is_mine_2: bool = wallet.is_mine(other_script).unwrap();
+//         assert_matches!(is_mine_2, false);
+//     }
+// }

bdk-ffi/tests/README.md

@@ -0,0 +1,21 @@
+# Integration tests for bdk-ffi
+
+This contains simple tests to make sure bdk-ffi can be used as a dependency for each of the 
+supported bindings languages.
+
+To skip integration tests and only run unit tests use `cargo test --lib`. 
+
+To run all tests including integration tests use `CLASSPATH=./tests/jna/jna-5.8.0.jar cargo test`. 
+
+Before running integration tests you must install the following development tools:
+
+1. [Java](https://openjdk.org/) and [Kotlin](https://kotlinlang.org/), 
+[sdkman](https://sdkman.io/) can help:
+   ```shell
+   sdk install java 11.0.16.1-zulu
+   sdk install kotlin 1.7.20`
+   ```
+   
+2. [Swift](https://www.swift.org/)
+
+3. [Python](https://www.python.org/)

bdk-ffi/tests/bindings/test.kts

@@ -0,0 +1,8 @@
+/*
+ * This is a basic test kotlin program that does nothing but confirm that the kotlin bindings compile
+ * and that a program that depends on them will run.
+ */
+
+import org.bitcoindevkit.*
+
+val network = Network.TESTNET

bdk-ffi/tests/bindings/test.py

@@ -0,0 +1,10 @@
+import unittest
+from bdk import *
+
+class TestBdk(unittest.TestCase):
+
+    def test_some_enum(self):
+        network = Network.TESTNET
+
+if __name__=='__main__':
+    unittest.main()

bdk-ffi/tests/bindings/test.swift

@@ -0,0 +1,9 @@
+/*
+ * This is a basic test swift program that does nothing but confirm that the swift bindings compile
+ * and that a program that depends on them will run.
+ */
+
+import Foundation
+import bdk
+
+let network = Network.testnet

bdk-ffi/tests/test_generated_bindings.rs

@@ -0,0 +1,5 @@
+uniffi::build_foreign_language_testcases!(
+    "tests/bindings/test.kts",
+    "tests/bindings/test.swift",
+    "tests/bindings/test.py",
+);

bdk-ffi/uniffi-bindgen.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi::uniffi_bindgen_main()
+}

bdk-jvm/README.md

@@ -0,0 +1,108 @@
+# bdk-jvm
+This project builds a .jar package for the JVM platform that provide Kotlin language bindings for the [`bdk`] library. The Kotlin language bindings are created by the `bdk-ffi` project which is included in the root of this repository.
+
+## How to Use
+To use the Kotlin language bindings for [`bdk`] in your JVM project add the following to your gradle dependencies:
+```kotlin
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+  implementation("org.bitcoindevkit:bdk-jvm:<version>")
+}
+```
+
+You may then import and use the `org.bitcoindevkit` library in your Kotlin code like so. Note that this example is for the `0.30.0` release. For examples of the 1.0 API in the alpha releases, take a look at the tests [here](https://github.com/bitcoindevkit/bdk-ffi/tree/master/bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit).
+```kotlin
+import org.bitcoindevkit.*
+
+// ...
+
+val externalDescriptor = Descriptor("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)", Network.TESTNET)
+val internalDescriptor = Descriptor("wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)", Network.TESTNET)
+
+val databaseConfig = DatabaseConfig.Memory
+
+val blockchainConfig = BlockchainConfig.Electrum(
+    ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5u, null, 10u, true)
+)
+val wallet = Wallet(externalDescriptor, internalDescriptor, Network.TESTNET, databaseConfig, blockchainConfig)
+val newAddress = wallet.getAddress(AddressIndex.LastUnused)
+```
+
+### Snapshot releases
+To use a snapshot release, specify the snapshot repository url in the `repositories` block and use the snapshot version in the `dependencies` block:
+```kotlin
+repositories {
+    maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
+}
+
+dependencies { 
+    implementation("org.bitcoindevkit:bdk-jvm:<version-SNAPSHOT>")
+}
+```
+
+## Example Projects
+* [Tatooine Faucet](https://github.com/thunderbiscuit/tatooine)
+
+## How to build
+_Note that Kotlin version `1.6.10` or later is required to build the library._
+1. Install JDK 11. It must be version 11 (not 17), otherwise it won't build. For example, with SDKMAN!:
+```shell
+curl -s "https://get.sdkman.io" | bash
+source "$HOME/.sdkman/bin/sdkman-init.sh"
+sdk install java 11.0.19-tem
+```
+2. Install Rust (note that we are currently building using Rust 1.73.0):
+```shell
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup default 1.73.0
+```
+3. Clone this repository.
+```shell
+git clone https://github.com/bitcoindevkit/bdk-ffi
+```
+4. If building on macOS install required intel and m1 jvm targets
+```sh
+rustup target add x86_64-apple-darwin aarch64-apple-darwin
+```
+5. Build kotlin bindings
+```sh
+./gradlew buildJvmLib
+```
+
+## How to publish to your local Maven repo
+```shell
+cd bdk-jvm
+./gradlew publishToMavenLocal --exclude-task signMavenPublication
+```
+
+Note that the commands assume you don't need the local libraries to be signed. If you do wish to sign them, simply set your `~/.gradle/gradle.properties` signing key values like so:
+```properties
+signing.gnupg.keyName=<YOUR_GNUPG_ID>
+signing.gnupg.passphrase=<YOUR_GNUPG_PASSPHRASE>
+```
+
+and use the `publishToMavenLocal` task without excluding the signing task:
+```shell
+./gradlew publishToMavenLocal
+```
+
+## Known issues
+## JNA dependency
+Depending on the JVM version you use, you might not have the JNA dependency on your classpath. The exception thrown will be 
+```shell
+class file for com.sun.jna.Pointer not found
+```
+
+The solution is to add JNA as a dependency like so:
+```kotlin
+dependencies {
+    // ...
+    implementation("net.java.dev.jna:jna:5.12.1")
+}
+```
+
+[`bdk`]: https://github.com/bitcoindevkit/bdk
+[`bdk-ffi`]: https://github.com/bitcoindevkit/bdk-ffi

bdk-jvm/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+    id("io.github.gradle-nexus.publish-plugin") version "1.1.0"
+}
+
+// library version is defined in gradle.properties
+val libraryVersion: String by project
+
+// These properties are required here so that the nexus publish-plugin
+// finds a staging profile with the correct group (group is otherwise set as "")
+// and knows whether to publish to a SNAPSHOT repository or not
+// https://github.com/gradle-nexus/publish-plugin#applying-the-plugin
+group = "org.bitcoindevkit"
+version = libraryVersion
+
+nexusPublishing {
+    repositories {
+        create("sonatype") {
+            nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
+
+            val ossrhUsername: String? by project
+            val ossrhPassword: String? by project
+            username.set(ossrhUsername)
+            password.set(ossrhPassword)
+        }
+    }
+}

bdk-jvm/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx1536m
+android.enableJetifier=true
+kotlin.code.style=official
+libraryVersion=1.0.0-alpha.2-rc1

bdk-jvm/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

bdk-jvm/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

bdk-jvm/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

bdk-jvm/lib/build.gradle.kts

@@ -0,0 +1,127 @@
+import org.gradle.api.tasks.testing.logging.TestExceptionFormat.*
+import org.gradle.api.tasks.testing.logging.TestLogEvent.*
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+// library version is defined in gradle.properties
+val libraryVersion: String by project
+
+plugins {
+    id("org.jetbrains.kotlin.jvm") version "1.6.10"
+    id("java-library")
+    id("maven-publish")
+    id("signing")
+
+    // Custom plugin to generate the native libs and bindings file
+    id("org.bitcoindevkit.plugins.generate-jvm-bindings")
+}
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+    withSourcesJar()
+    withJavadocJar()
+}
+
+// This block ensures that the tests that require access to a blockchain are not
+// run if the -P excludeConnectedTests flag is passed to gradle.
+// This ensures our CI runs are not fickle by not requiring access to testnet.
+// This is a workaround until we have a proper regtest setup for the CI.
+// Note that the command in the CI is ./gradlew test -P excludeConnectedTests
+tasks.test {
+    if (project.hasProperty("excludeConnectedTests")) {
+        exclude("**/LiveWalletTest.class")
+        exclude("**/LiveTxBuilderTest.class")
+    }
+}
+
+testing {
+    suites {
+        val test by getting(JvmTestSuite::class) {
+            useKotlinTest("1.6.10")
+        }
+    }
+}
+
+tasks.withType<Test> {
+    testLogging {
+        events(PASSED, SKIPPED, FAILED, STANDARD_OUT, STANDARD_ERROR)
+        exceptionFormat = FULL
+        showExceptions = true
+        showStackTraces = true
+        showCauses = true
+    }
+}
+
+dependencies {
+    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7")
+    implementation("net.java.dev.jna:jna:5.8.0")
+    api("org.slf4j:slf4j-api:1.7.30")
+    testImplementation("junit:junit:4.13.2")
+    testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.8.2")
+    testImplementation("ch.qos.logback:logback-classic:1.2.3")
+    testImplementation("ch.qos.logback:logback-core:1.2.3")
+}
+
+afterEvaluate {
+    publishing {
+        publications {
+            create<MavenPublication>("maven") {
+                groupId = "org.bitcoindevkit"
+                artifactId = "bdk-jvm"
+                version = libraryVersion
+
+                from(components["java"])
+                pom {
+                    name.set("bdk-jvm")
+                    description.set("Bitcoin Dev Kit Kotlin language bindings.")
+                    url.set("https://bitcoindevkit.org")
+                    licenses {
+                        license {
+                            name.set("APACHE 2.0")
+                            url.set("https://github.com/bitcoindevkit/bdk/blob/master/LICENSE-APACHE")
+                        }
+                        license {
+                            name.set("MIT")
+                            url.set("https://github.com/bitcoindevkit/bdk/blob/master/LICENSE-MIT")
+                        }
+                    }
+                    developers {
+                        developer {
+                            id.set("bdkdevelopers")
+                            name.set("Bitcoin Dev Kit Developers")
+                            email.set("dev@bitcoindevkit.org")
+                        }
+                    }
+                    scm {
+                        connection.set("scm:git:github.com/bitcoindevkit/bdk-ffi.git")
+                        developerConnection.set("scm:git:ssh://github.com/bitcoindevkit/bdk-ffi.git")
+                        url.set("https://github.com/bitcoindevkit/bdk-ffi/tree/master")
+                    }
+                }
+            }
+        }
+    }
+}
+
+signing {
+    val signingKeyId: String? by project
+    val signingKey: String? by project
+    val signingPassword: String? by project
+    useInMemoryPgpKeys(signingKeyId, signingKey, signingPassword)
+    sign(publishing.publications)
+}
+
+// This task dependency ensures that we build the bindings
+// binaries before running the tests
+tasks.withType<KotlinCompile> {
+    dependsOn("buildJvmLib")
+
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/LiveTxBuilderTest.kt

@@ -0,0 +1,29 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class LiveTxBuilderTest {
+    @Test
+    fun testTxBuilder() {
+        val descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient = EsploraClient("https://mempool.space/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+
+        assert(wallet.getBalance().total() > 0uL)
+
+        val recipient: Address = Address("tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", Network.TESTNET)
+        val psbt: PartiallySignedTransaction = TxBuilder()
+            .addRecipient(recipient.scriptPubkey(), 4200uL)
+            .feeRate(2.0f)
+            .finish(wallet)
+
+        println(psbt.serialize())
+
+        assertTrue(psbt.serialize().startsWith("cHNi"), "PSBT should start with 'cHNi'")
+    }
+}

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/LiveWalletTest.kt

@@ -0,0 +1,53 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class LiveWalletTest {
+    @Test
+    fun testSyncedBalance() {
+        val descriptor: Descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet: Wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient: EsploraClient = EsploraClient("https://mempool.space/testnet/api")
+        // val esploraClient = EsploraClient("https://blockstream.info/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+
+        assert(wallet.getBalance().total() > 0uL)
+    }
+
+    @Test
+    fun testBroadcastTransaction() {
+        val descriptor = Descriptor("wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)", Network.TESTNET)
+        val wallet = Wallet.newNoPersist(descriptor, null, Network.TESTNET)
+        val esploraClient = EsploraClient("https://mempool.space/testnet/api")
+        val update = esploraClient.scan(wallet, 10uL, 1uL)
+
+        wallet.applyUpdate(update)
+        println("Balance: ${wallet.getBalance().total()}")
+        println("New address: ${wallet.getAddress(AddressIndex.New).address.asString()}")
+
+        assert(wallet.getBalance().total() > 0uL) {
+            "Wallet balance must be greater than 0! Please send funds to ${wallet.getAddress(AddressIndex.New).address} and try again."
+        }
+
+        val recipient: Address = Address("tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", Network.TESTNET)
+
+        val psbt: PartiallySignedTransaction = TxBuilder()
+            .addRecipient(recipient.scriptPubkey(), 4200uL)
+            .feeRate(2.0f)
+            .finish(wallet)
+
+        println(psbt.serialize())
+        assertTrue(psbt.serialize().startsWith("cHNi"), "PSBT should start with 'cHNi'")
+
+        val walletDidSign = wallet.sign(psbt)
+        assertTrue(walletDidSign)
+
+        val tx: Transaction = psbt.extractTx()
+
+        println("Txid is: ${tx.txid()}")
+        esploraClient.broadcast(tx)
+    }
+}

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/OfflineDescriptorTest.kt

@@ -0,0 +1,18 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class OfflineDescriptorTest {
+    @Test
+    fun testDescriptorBip86() {
+        val mnemonic: Mnemonic = Mnemonic.fromString("space echo position wrist orient erupt relief museum myself grain wisdom tumble")
+        val descriptorSecretKey: DescriptorSecretKey = DescriptorSecretKey(Network.TESTNET, mnemonic, null)
+        val descriptor: Descriptor = Descriptor.newBip86(descriptorSecretKey, KeychainKind.EXTERNAL, Network.TESTNET)
+
+        assertEquals(
+            expected = "tr([be1eec8f/86'/1'/0']tpubDCTtszwSxPx3tATqDrsSyqScPNnUChwQAVAkanuDUCJQESGBbkt68nXXKRDifYSDbeMa2Xg2euKbXaU3YphvGWftDE7ozRKPriT6vAo3xsc/0/*)#m7puekcx",
+            actual = descriptor.asString()
+        )
+    }
+}

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/OfflineWalletTest.kt

@@ -0,0 +1,53 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class OfflineWalletTest {
+    @Test
+    fun testDescriptorBip86() {
+        val mnemonic: Mnemonic = Mnemonic(WordCount.WORDS12)
+        val descriptorSecretKey: DescriptorSecretKey = DescriptorSecretKey(Network.TESTNET, mnemonic, null)
+        val descriptor: Descriptor = Descriptor.newBip86(descriptorSecretKey, KeychainKind.EXTERNAL, Network.TESTNET)
+
+        assertTrue(descriptor.asString().startsWith("tr"), "Bip86 Descriptor does not start with 'tr'")
+    }
+
+   @Test
+    fun testNewAddress() {
+        val descriptor: Descriptor = Descriptor(
+            "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
+            Network.TESTNET
+        )
+        val wallet: Wallet = Wallet.newNoPersist(
+            descriptor,
+            null,
+            Network.TESTNET
+        )
+        val addressInfo: AddressInfo = wallet.getAddress(AddressIndex.New)
+
+        assertEquals(
+            expected = "tb1qzg4mckdh50nwdm9hkzq06528rsu73hjxxzem3e",
+            actual = addressInfo.address.asString()
+        )
+    }
+
+    @Test
+    fun testBalance() {
+        val descriptor: Descriptor = Descriptor(
+            "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
+            Network.TESTNET
+        )
+        val wallet: Wallet = Wallet.newNoPersist(
+            descriptor,
+            null,
+            Network.TESTNET
+        )
+
+        assertEquals(
+            expected = 0uL,
+            actual = wallet.getBalance().total()
+        )
+    }
+}

bdk-jvm/plugins/README.md

@@ -0,0 +1,16 @@
+# Readme
+The purpose of this directory is to host the Gradle plugin that adds tasks for building the native binaries required by bdk-jvm, and building the language bindings files.
+
+The plugin is applied to the `build.gradle.kts` file through the `plugins` block:
+```kotlin
+plugins {
+    id("org.bitcoindevkit.plugin.generate-jvm-bindings")
+}
+```
+
+The plugin adds a series of tasks which are brought together into an aggregate task called `buildJvmLib` for `bdk-jvm`. 
+
+This aggregate task:
+1. Builds the native library(ies) using `bdk-ffi`
+2. Places it in the correct resource directory
+3. Builds the bindings file

bdk-jvm/plugins/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    id("java-gradle-plugin")
+    `kotlin-dsl`
+}
+
+gradlePlugin {
+    plugins {
+        create("uniFfiJvmBindings") {
+            id = "org.bitcoindevkit.plugins.generate-jvm-bindings"
+            implementationClass = "org.bitcoindevkit.plugins.UniFfiJvmPlugin"
+        }
+    }
+}

bdk-jvm/plugins/settings.gradle.kts

@@ -0,0 +1,8 @@
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+        google()
+    }
+}
+
+// include(":plugins")

bdk-jvm/plugins/src/main/kotlin/org/bitcoindevkit/plugins/Enums.kt

@@ -0,0 +1,16 @@
+package org.bitcoindevkit.plugins
+
+
+val operatingSystem: OS = when {
+    System.getProperty("os.name").contains("mac", ignoreCase = true) -> OS.MAC
+    System.getProperty("os.name").contains("linux", ignoreCase = true) -> OS.LINUX
+    System.getProperty("os.name").contains("windows", ignoreCase = true) -> OS.WINDOWS
+    else -> OS.OTHER
+}
+
+enum class OS {
+    MAC,
+    LINUX,
+    WINDOWS,
+    OTHER,
+}

bdk-jvm/plugins/src/main/kotlin/org/bitcoindevkit/plugins/UniFfiJvmPlugin.kt

@@ -0,0 +1,150 @@
+package org.bitcoindevkit.plugins
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.tasks.Exec
+import org.gradle.kotlin.dsl.getValue
+import org.gradle.kotlin.dsl.provideDelegate
+import org.gradle.kotlin.dsl.register
+
+// TODO 18: Migrate hard coded strings to constants all in the same location so they're at least easy
+//          to find and reason about.
+internal class UniFfiJvmPlugin : Plugin<Project> {
+    override fun apply(target: Project): Unit = target.run {
+
+        // register a task called buildJvmBinaries which will run something like
+        // cargo build --release --target aarch64-apple-darwin
+        val buildJvmBinaries by tasks.register<DefaultTask>("buildJvmBinaries") {
+            if (operatingSystem == OS.MAC) {
+                exec {
+                    workingDir("${project.projectDir}/../../bdk-ffi")
+                    executable("cargo")
+                    val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "x86_64-apple-darwin")
+                    args(cargoArgs)
+                }
+                exec {
+                    workingDir("${project.projectDir}/../../bdk-ffi")
+                    executable("cargo")
+                    val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "aarch64-apple-darwin")
+                    args(cargoArgs)
+                }
+            } else if (operatingSystem == OS.LINUX) {
+                exec {
+                    workingDir("${project.projectDir}/../../bdk-ffi")
+                    executable("cargo")
+                    val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "x86_64-unknown-linux-gnu")
+                    args(cargoArgs)
+                }
+            } else if (operatingSystem == OS.WINDOWS) {
+                exec {
+                    workingDir("${project.projectDir}/../../bdk-ffi")
+                    executable("cargo")
+                    val cargoArgs: List<String> = listOf("build", "--profile", "release-smaller", "--target", "x86_64-pc-windows-msvc")
+                    args(cargoArgs)
+                }
+            }
+        }
+
+        // move the native libs build by cargo from target/.../release/
+        // to their place in the bdk-jvm library
+        val moveNativeJvmLibs by tasks.register<DefaultTask>("moveNativeJvmLibs") {
+
+            // dependsOn(buildJvmBinaryX86_64MacOS, buildJvmBinaryAarch64MacOS, buildJvmBinaryLinux)
+            dependsOn(buildJvmBinaries)
+
+            data class CopyMetadata(val targetDir: String, val resDir: String, val ext: String)
+            val libsToCopy: MutableList<CopyMetadata> = mutableListOf()
+
+            if (operatingSystem == OS.MAC) {
+                libsToCopy.add(
+                    CopyMetadata(
+                        targetDir = "aarch64-apple-darwin",
+                        resDir = "darwin-aarch64",
+                        ext = "dylib"
+                    )
+                )
+                libsToCopy.add(
+                    CopyMetadata(
+                        targetDir = "x86_64-apple-darwin",
+                        resDir = "darwin-x86-64",
+                        ext = "dylib"
+                    )
+                )
+            } else if (operatingSystem == OS.LINUX) {
+                libsToCopy.add(
+                    CopyMetadata(
+                        targetDir = "x86_64-unknown-linux-gnu",
+                        resDir = "linux-x86-64",
+                        ext = "so"
+                    )
+                )
+            } else if (operatingSystem == OS.WINDOWS) {
+                libsToCopy.add(
+                    CopyMetadata(
+                        targetDir = "x86_64-pc-windows-msvc",
+                        resDir = "win32-x86-64",
+                        ext = "dll"
+                    )
+                )
+            }
+            val libName = when (operatingSystem) {
+                OS.WINDOWS -> "bdkffi"
+                else       -> "libbdkffi"
+            }
+
+            libsToCopy.forEach {
+                doFirst {
+                    copy {
+                        with(it) {
+                            from("${project.projectDir}/../../bdk-ffi/target/${this.targetDir}/release-smaller/${libName}.${this.ext}")
+                            into("${project.projectDir}/../../bdk-jvm/lib/src/main/resources/${this.resDir}/")
+                        }
+                    }
+                }
+            }
+        }
+
+        // generate the bindings using the bdk-ffi-bindgen tool created in the bdk-ffi submodule
+        val generateJvmBindings by tasks.register<Exec>("generateJvmBindings") {
+
+            dependsOn(moveNativeJvmLibs)
+
+            // TODO 2: Is the Windows name the correct one?
+            // TODO 3: This will not work on mac Intel (x86_64 architecture)
+            // val libraryPath = when (operatingSystem) {
+            //     OS.LINUX   -> "./target/x86_64-unknown-linux-gnu/release-smaller/libbdkffi.so"
+            //     OS.MAC     -> "./target/aarch64-apple-darwin/release-smaller/libbdkffi.dylib"
+            //     OS.WINDOWS -> "./target/x86_64-pc-windows-msvc/release-smaller/bdkffi.dll"
+            //     else       -> throw Exception("Unsupported OS")
+            // }
+
+            // workingDir("${project.projectDir}/../../bdk-ffi/")
+            // val cargoArgs: List<String> = listOf("run", "--bin", "uniffi-bindgen", "generate", "--library", libraryPath, "--language", "kotlin", "--out-dir", "../bdk-jvm/lib/src/main/kotlin/", "--no-format")
+
+            // The code above was for the migration to uniffi 0.24.3 using the --library flag
+            // The code below works with uniffi 0.23.0
+            workingDir("${project.projectDir}/../../bdk-ffi/")
+            val cargoArgs: List<String> = listOf("run", "--bin", "uniffi-bindgen", "generate", "src/bdk.udl", "--language", "kotlin", "--out-dir", "../bdk-jvm/lib/src/main/kotlin", "--no-format")
+            executable("cargo")
+            args(cargoArgs)
+
+            doLast {
+                println("JVM bindings file successfully created")
+            }
+        }
+
+        // we need an aggregate task which will run the 3 required tasks to build the JVM libs in order
+        // the task will also appear in the printout of the ./gradlew tasks task with a group and description
+        tasks.register("buildJvmLib") {
+            group = "Bitcoindevkit"
+            description = "Aggregate task to build JVM library"
+
+            dependsOn(
+                buildJvmBinaries,
+                moveNativeJvmLibs,
+                generateJvmBindings
+            )
+        }
+    }
+}

bdk-jvm/settings.gradle.kts

@@ -0,0 +1,4 @@
+rootProject.name = "bdk-jvm"
+
+include(":lib")
+includeBuild("plugins")

bdk-python/.gitignore

@@ -0,0 +1,16 @@
+.tox/
+dist/
+bdkpython.egg-info/
+__pycache__/
+libbdkffi.dylib
+.idea/
+.DS_Store
+
+*.swp
+
+src/bdkpython/bdk.py
+src/bdkpython/*.so
+*.whl
+build/
+
+testing-setup-py-simple-example.py

bdk-python/MANIFEST.in

@@ -0,0 +1,3 @@
+include ./src/bdkpython/libbdkffi.dylib
+include ./src/bdkpython/libbdkffi.so
+include ./src/bdkpython/bdkffi.dll

bdk-python/README.md

@@ -0,0 +1,36 @@
+# bdk-python
+The Python language bindings for the [bitcoindevkit](https://github.com/bitcoindevkit).
+
+See the [package on PyPI](https://pypi.org/project/bdkpython/).  
+
+## Install from PyPI
+Install the latest release using
+```shell
+pip install bdkpython
+```
+
+## Run the tests
+```shell
+pip install --requirement requirements.txt
+bash ./scripts/generate-linux.sh # here you should run the script appropriate for your platform
+python setup.py bdist_wheel --verbose
+pip install ./dist/bdkpython-<yourversion>.whl --force-reinstall
+python -m unittest --verbose
+```
+
+## Build the package
+```shell
+# Install dependencies
+pip install --requirement requirements.txt
+
+# Generate the bindings (use the script appropriate for your platform)
+bash ./scripts/generate-linux.sh
+
+# Build the wheel
+python setup.py --verbose bdist_wheel
+```
+
+## Install locally
+```shell
+pip install ./dist/bdkpython-<yourversion>.whl
+```

bdk-python/nix/uniffi_0.14.1_cargo_lock.patch

@@ -0,0 +1,387 @@
+--- /dev/null	2021-12-15 11:22:02.342000000 +0100
++++ uniffi_bindgen/Cargo.lock	2021-12-15 16:15:16.132084011 +0100
+@@ -0,0 +1,384 @@
++# This file is automatically @generated by Cargo.
++# It is not intended for manual editing.
++version = 3
++
++[[package]]
++name = "anyhow"
++version = "1.0.51"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8b26702f315f53b6071259e15dd9d64528213b44d61de1ec926eca7715d62203"
++
++[[package]]
++name = "arrayvec"
++version = "0.5.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
++
++[[package]]
++name = "askama"
++version = "0.10.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d298738b6e47e1034e560e5afe63aa488fea34e25ec11b855a76f0d7b8e73134"
++dependencies = [
++ "askama_derive",
++ "askama_escape",
++ "askama_shared",
++]
++
++[[package]]
++name = "askama_derive"
++version = "0.10.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ca2925c4c290382f9d2fa3d1c1b6a63fa1427099721ecca4749b154cc9c25522"
++dependencies = [
++ "askama_shared",
++ "proc-macro2",
++ "syn",
++]
++
++[[package]]
++name = "askama_escape"
++version = "0.10.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "90c108c1a94380c89d2215d0ac54ce09796823cca0fd91b299cfff3b33e346fb"
++
++[[package]]
++name = "askama_shared"
++version = "0.11.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2582b77e0f3c506ec4838a25fa8a5f97b9bed72bb6d3d272ea1c031d8bd373bc"
++dependencies = [
++ "askama_escape",
++ "nom 6.2.1",
++ "proc-macro2",
++ "quote",
++ "serde",
++ "syn",
++ "toml",
++]
++
++[[package]]
++name = "bitflags"
++version = "1.3.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
++
++[[package]]
++name = "bitvec"
++version = "0.19.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "55f93d0ef3363c364d5976646a38f04cf67cfe1d4c8d160cdea02cab2c116b33"
++dependencies = [
++ "funty",
++ "radium",
++ "tap",
++ "wyz",
++]
++
++[[package]]
++name = "camino"
++version = "1.0.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "52d74260d9bf6944e2208aa46841b4b8f0d7ffc0849a06837b2f510337f86b2b"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "cargo-platform"
++version = "0.1.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cbdb825da8a5df079a43676dbe042702f1707b1109f713a01420fbb4cc71fa27"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "cargo_metadata"
++version = "0.13.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "081e3f0755c1f380c2d010481b6fa2e02973586d5f2b24eebb7a2a1d98b143d8"
++dependencies = [
++ "camino",
++ "cargo-platform",
++ "semver",
++ "semver-parser",
++ "serde",
++ "serde_json",
++]
++
++[[package]]
++name = "cfg-if"
++version = "1.0.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
++
++[[package]]
++name = "clap"
++version = "2.34.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
++dependencies = [
++ "bitflags",
++ "textwrap",
++ "unicode-width",
++]
++
++[[package]]
++name = "funty"
++version = "1.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
++
++[[package]]
++name = "heck"
++version = "0.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
++dependencies = [
++ "unicode-segmentation",
++]
++
++[[package]]
++name = "itoa"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
++
++[[package]]
++name = "lexical-core"
++version = "0.7.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
++dependencies = [
++ "arrayvec",
++ "bitflags",
++ "cfg-if",
++ "ryu",
++ "static_assertions",
++]
++
++[[package]]
++name = "memchr"
++version = "2.3.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
++
++[[package]]
++name = "nom"
++version = "5.1.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
++dependencies = [
++ "memchr",
++ "version_check",
++]
++
++[[package]]
++name = "nom"
++version = "6.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "9c5c51b9083a3c620fa67a2a635d1ce7d95b897e957d6b28ff9a5da960a103a6"
++dependencies = [
++ "bitvec",
++ "funty",
++ "lexical-core",
++ "memchr",
++ "version_check",
++]
++
++[[package]]
++name = "paste"
++version = "1.0.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "0744126afe1a6dd7f394cb50a716dbe086cb06e255e53d8d0185d82828358fb5"
++
++[[package]]
++name = "pest"
++version = "2.1.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
++dependencies = [
++ "ucd-trie",
++]
++
++[[package]]
++name = "proc-macro2"
++version = "1.0.34"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2f84e92c0f7c9d58328b85a78557813e4bd845130db68d7184635344399423b1"
++dependencies = [
++ "unicode-xid",
++]
++
++[[package]]
++name = "quote"
++version = "1.0.10"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
++dependencies = [
++ "proc-macro2",
++]
++
++[[package]]
++name = "radium"
++version = "0.5.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8"
++
++[[package]]
++name = "ryu"
++version = "1.0.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
++
++[[package]]
++name = "semver"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f301af10236f6df4160f7c3f04eec6dbc70ace82d23326abad5edee88801c6b6"
++dependencies = [
++ "semver-parser",
++ "serde",
++]
++
++[[package]]
++name = "semver-parser"
++version = "0.10.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "00b0bef5b7f9e0df16536d3961cfb6e84331c065b4066afb39768d0e319411f7"
++dependencies = [
++ "pest",
++]
++
++[[package]]
++name = "serde"
++version = "1.0.131"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b4ad69dfbd3e45369132cc64e6748c2d65cdfb001a2b1c232d128b4ad60561c1"
++dependencies = [
++ "serde_derive",
++]
++
++[[package]]
++name = "serde_derive"
++version = "1.0.131"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b710a83c4e0dff6a3d511946b95274ad9ca9e5d3ae497b63fda866ac955358d2"
++dependencies = [
++ "proc-macro2",
++ "quote",
++ "syn",
++]
++
++[[package]]
++name = "serde_json"
++version = "1.0.73"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "bcbd0344bc6533bc7ec56df11d42fb70f1b912351c0825ccb7211b59d8af7cf5"
++dependencies = [
++ "itoa",
++ "ryu",
++ "serde",
++]
++
++[[package]]
++name = "static_assertions"
++version = "1.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
++
++[[package]]
++name = "syn"
++version = "1.0.82"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8daf5dd0bb60cbd4137b1b587d2fc0ae729bc07cf01cd70b36a1ed5ade3b9d59"
++dependencies = [
++ "proc-macro2",
++ "quote",
++ "unicode-xid",
++]
++
++[[package]]
++name = "tap"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
++
++[[package]]
++name = "textwrap"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
++dependencies = [
++ "unicode-width",
++]
++
++[[package]]
++name = "toml"
++version = "0.5.8"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "ucd-trie"
++version = "0.1.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
++
++[[package]]
++name = "unicode-segmentation"
++version = "1.8.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
++
++[[package]]
++name = "unicode-width"
++version = "0.1.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
++
++[[package]]
++name = "unicode-xid"
++version = "0.2.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
++
++[[package]]
++name = "uniffi_bindgen"
++version = "0.14.1"
++dependencies = [
++ "anyhow",
++ "askama",
++ "cargo_metadata",
++ "clap",
++ "heck",
++ "paste",
++ "serde",
++ "toml",
++ "weedle",
++]
++
++[[package]]
++name = "version_check"
++version = "0.9.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
++
++[[package]]
++name = "weedle"
++version = "0.12.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "610950904727748ca09682e857f0d6d6437f0ca862f32f9229edba8cec8b2635"
++dependencies = [
++ "nom 5.1.2",
++]
++
++[[package]]
++name = "wyz"
++version = "0.2.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"

bdk-python/nix/uniffi_0.15.2_cargo_lock.patch

@@ -0,0 +1,387 @@
+--- /dev/null	2021-12-15 11:22:02.342000000 +0100
++++ uniffi_bindgen/Cargo.lock	2021-12-15 15:54:49.278543090 +0100
+@@ -0,0 +1,384 @@
++# This file is automatically @generated by Cargo.
++# It is not intended for manual editing.
++version = 3
++
++[[package]]
++name = "anyhow"
++version = "1.0.51"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8b26702f315f53b6071259e15dd9d64528213b44d61de1ec926eca7715d62203"
++
++[[package]]
++name = "arrayvec"
++version = "0.5.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
++
++[[package]]
++name = "askama"
++version = "0.10.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d298738b6e47e1034e560e5afe63aa488fea34e25ec11b855a76f0d7b8e73134"
++dependencies = [
++ "askama_derive",
++ "askama_escape",
++ "askama_shared",
++]
++
++[[package]]
++name = "askama_derive"
++version = "0.10.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ca2925c4c290382f9d2fa3d1c1b6a63fa1427099721ecca4749b154cc9c25522"
++dependencies = [
++ "askama_shared",
++ "proc-macro2",
++ "syn",
++]
++
++[[package]]
++name = "askama_escape"
++version = "0.10.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "90c108c1a94380c89d2215d0ac54ce09796823cca0fd91b299cfff3b33e346fb"
++
++[[package]]
++name = "askama_shared"
++version = "0.11.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2582b77e0f3c506ec4838a25fa8a5f97b9bed72bb6d3d272ea1c031d8bd373bc"
++dependencies = [
++ "askama_escape",
++ "nom 6.2.1",
++ "proc-macro2",
++ "quote",
++ "serde",
++ "syn",
++ "toml",
++]
++
++[[package]]
++name = "bitflags"
++version = "1.3.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
++
++[[package]]
++name = "bitvec"
++version = "0.19.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "55f93d0ef3363c364d5976646a38f04cf67cfe1d4c8d160cdea02cab2c116b33"
++dependencies = [
++ "funty",
++ "radium",
++ "tap",
++ "wyz",
++]
++
++[[package]]
++name = "camino"
++version = "1.0.5"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "52d74260d9bf6944e2208aa46841b4b8f0d7ffc0849a06837b2f510337f86b2b"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "cargo-platform"
++version = "0.1.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "cbdb825da8a5df079a43676dbe042702f1707b1109f713a01420fbb4cc71fa27"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "cargo_metadata"
++version = "0.13.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "081e3f0755c1f380c2d010481b6fa2e02973586d5f2b24eebb7a2a1d98b143d8"
++dependencies = [
++ "camino",
++ "cargo-platform",
++ "semver",
++ "semver-parser",
++ "serde",
++ "serde_json",
++]
++
++[[package]]
++name = "cfg-if"
++version = "1.0.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
++
++[[package]]
++name = "clap"
++version = "2.34.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
++dependencies = [
++ "bitflags",
++ "textwrap",
++ "unicode-width",
++]
++
++[[package]]
++name = "funty"
++version = "1.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
++
++[[package]]
++name = "heck"
++version = "0.3.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
++dependencies = [
++ "unicode-segmentation",
++]
++
++[[package]]
++name = "itoa"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
++
++[[package]]
++name = "lexical-core"
++version = "0.7.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
++dependencies = [
++ "arrayvec",
++ "bitflags",
++ "cfg-if",
++ "ryu",
++ "static_assertions",
++]
++
++[[package]]
++name = "memchr"
++version = "2.3.4"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
++
++[[package]]
++name = "nom"
++version = "5.1.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
++dependencies = [
++ "memchr",
++ "version_check",
++]
++
++[[package]]
++name = "nom"
++version = "6.2.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "9c5c51b9083a3c620fa67a2a635d1ce7d95b897e957d6b28ff9a5da960a103a6"
++dependencies = [
++ "bitvec",
++ "funty",
++ "lexical-core",
++ "memchr",
++ "version_check",
++]
++
++[[package]]
++name = "paste"
++version = "1.0.6"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "0744126afe1a6dd7f394cb50a716dbe086cb06e255e53d8d0185d82828358fb5"
++
++[[package]]
++name = "pest"
++version = "2.1.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
++dependencies = [
++ "ucd-trie",
++]
++
++[[package]]
++name = "proc-macro2"
++version = "1.0.34"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "2f84e92c0f7c9d58328b85a78557813e4bd845130db68d7184635344399423b1"
++dependencies = [
++ "unicode-xid",
++]
++
++[[package]]
++name = "quote"
++version = "1.0.10"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
++dependencies = [
++ "proc-macro2",
++]
++
++[[package]]
++name = "radium"
++version = "0.5.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8"
++
++[[package]]
++name = "ryu"
++version = "1.0.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
++
++[[package]]
++name = "semver"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "f301af10236f6df4160f7c3f04eec6dbc70ace82d23326abad5edee88801c6b6"
++dependencies = [
++ "semver-parser",
++ "serde",
++]
++
++[[package]]
++name = "semver-parser"
++version = "0.10.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "00b0bef5b7f9e0df16536d3961cfb6e84331c065b4066afb39768d0e319411f7"
++dependencies = [
++ "pest",
++]
++
++[[package]]
++name = "serde"
++version = "1.0.131"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b4ad69dfbd3e45369132cc64e6748c2d65cdfb001a2b1c232d128b4ad60561c1"
++dependencies = [
++ "serde_derive",
++]
++
++[[package]]
++name = "serde_derive"
++version = "1.0.131"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b710a83c4e0dff6a3d511946b95274ad9ca9e5d3ae497b63fda866ac955358d2"
++dependencies = [
++ "proc-macro2",
++ "quote",
++ "syn",
++]
++
++[[package]]
++name = "serde_json"
++version = "1.0.73"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "bcbd0344bc6533bc7ec56df11d42fb70f1b912351c0825ccb7211b59d8af7cf5"
++dependencies = [
++ "itoa",
++ "ryu",
++ "serde",
++]
++
++[[package]]
++name = "static_assertions"
++version = "1.1.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
++
++[[package]]
++name = "syn"
++version = "1.0.82"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8daf5dd0bb60cbd4137b1b587d2fc0ae729bc07cf01cd70b36a1ed5ade3b9d59"
++dependencies = [
++ "proc-macro2",
++ "quote",
++ "unicode-xid",
++]
++
++[[package]]
++name = "tap"
++version = "1.0.1"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
++
++[[package]]
++name = "textwrap"
++version = "0.11.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
++dependencies = [
++ "unicode-width",
++]
++
++[[package]]
++name = "toml"
++version = "0.5.8"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
++dependencies = [
++ "serde",
++]
++
++[[package]]
++name = "ucd-trie"
++version = "0.1.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
++
++[[package]]
++name = "unicode-segmentation"
++version = "1.8.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
++
++[[package]]
++name = "unicode-width"
++version = "0.1.9"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
++
++[[package]]
++name = "unicode-xid"
++version = "0.2.2"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
++
++[[package]]
++name = "uniffi_bindgen"
++version = "0.15.2"
++dependencies = [
++ "anyhow",
++ "askama",
++ "cargo_metadata",
++ "clap",
++ "heck",
++ "paste",
++ "serde",
++ "toml",
++ "weedle",
++]
++
++[[package]]
++name = "version_check"
++version = "0.9.3"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
++
++[[package]]
++name = "weedle"
++version = "0.12.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "610950904727748ca09682e857f0d6d6437f0ca862f32f9229edba8cec8b2635"
++dependencies = [
++ "nom 5.1.2",
++]
++
++[[package]]
++name = "wyz"
++version = "0.2.0"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"

bdk-python/nix/uniffi_bindgen.nix

@@ -0,0 +1,20 @@
+with import <nixpkgs> {};
+
+rustPlatform.buildRustPackage rec {
+  pname = "uniffi_bindgen";
+  version = "0.15.2";
+  src = fetchFromGitHub {
+    owner = "mozilla";
+    repo = "uniffi-rs";
+    rev = "6fa9c06a394b4e9b219fa30fc94e353d17f86e11";
+    # rev = "refs/tags/v0.14.1";
+    sha256 = "1chahy1ac1r88drpslln2p1b04cbg79ylpxzyyp92s1z7ldm5ddb"; # 0.15.2
+    # sha256 = "1mff3f3fqqzqx1yv70ff1yzdnvbd90vg2r477mzzcgisg1wfpwi0"; # 0.14.1
+    fetchSubmodules = true;
+  } + "/uniffi_bindgen/";
+
+  doCheck = false;
+  cargoSha256 = "sha256:08gg285fq8i32nf9kd8s0nn0niacd7sg8krv818nx41i18sm2cf3"; # 0.15.2
+  # cargoSha256 = "sha256:01zp3rwlni988h02dqhkhzhwccs7bhwc1alhbf6gbw3av4b0m9cf"; # 0.14.1
+  cargoPatches = [ ./uniffi_0.15.2_cargo_lock.patch ];
+}

bdk-python/pyproject.toml

@@ -0,0 +1,7 @@
+[build-system]
+requires = ["setuptools", "wheel", "setuptools-rust"]
+
+[tool.pytest.ini_options]
+pythonpath = [
+  "."
+]

bdk-python/requirements-dev.txt

@@ -0,0 +1,2 @@
+pytest==7.1.2
+tox==3.25.1

bdk-python/requirements.txt

@@ -0,0 +1,4 @@
+semantic-version==2.9.0
+typing_extensions==4.0.1
+setuptools==67.4.0
+wheel==0.38.4

bdk-python/scripts/generate-linux.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+${PYBIN}/python --version
+${PYBIN}/pip install -r requirements.txt
+
+echo "Generating bdk.py..."
+cd ../bdk-ffi/
+cargo run --bin uniffi-bindgen generate src/bdk.udl --language python --out-dir ../bdk-python/src/bdkpython/ --no-format
+
+echo "Generating native binaries..."
+rustup default 1.73.0
+cargo build --profile release-smaller
+
+echo "Copying linux libbdkffi.so..."
+cp ./target/release-smaller/libbdkffi.so ../bdk-python/src/bdkpython/libbdkffi.so
+
+echo "All done!"

bdk-python/scripts/generate-macos-arm64.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+python3 --version
+pip install --user -r requirements.txt
+
+echo "Generating bdk.py..."
+cd ../bdk-ffi/
+cargo run --bin uniffi-bindgen generate src/bdk.udl --language python --out-dir ../bdk-python/src/bdkpython/ --no-format
+
+echo "Generating native binaries..."
+rustup default 1.73.0
+rustup target add aarch64-apple-darwin
+cargo build --profile release-smaller --target aarch64-apple-darwin
+
+echo "Copying libraries libbdkffi.dylib..."
+cp ./target/aarch64-apple-darwin/release-smaller/libbdkffi.dylib ../bdk-python/src/bdkpython/libbdkffi.dylib
+
+echo "All done!"

bdk-python/scripts/generate-macos-x86_64.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+python3 --version
+pip install --user -r requirements.txt
+
+echo "Generating bdk.py..."
+cd ../bdk-ffi/
+cargo run --bin uniffi-bindgen generate src/bdk.udl --language python --out-dir ../bdk-python/src/bdkpython/ --no-format
+
+echo "Generating native binaries..."
+rustup default 1.73.0
+rustup target add x86_64-apple-darwin
+cargo build --profile release-smaller --target x86_64-apple-darwin
+
+echo "Copying libraries libbdkffi.dylib..."
+cp ./target/x86_64-apple-darwin/release-smaller/libbdkffi.dylib ../bdk-python/src/bdkpython/libbdkffi.dylib
+
+echo "All done!"

bdk-python/scripts/generate-windows.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+python3 --version
+pip install --user -r requirements.txt
+
+echo "Generating bdk.py..."
+cd ../bdk-ffi/
+cargo run --bin uniffi-bindgen generate src/bdk.udl --language python --out-dir ../bdk-python/src/bdkpython/ --no-format
+
+echo "Generating native binaries..."
+rustup default 1.73.0
+rustup target add x86_64-pc-windows-msvc
+cargo build --profile release-smaller --target x86_64-pc-windows-msvc
+
+echo "Copying libraries bdkffi.dll..."
+cp ./target/x86_64-pc-windows-msvc/release-smaller/bdkffi.dll ../bdk-python/src/bdkpython/bdkffi.dll
+
+echo "All done!"

bdk-python/setup.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+from setuptools import setup
+
+LONG_DESCRIPTION = """# bdkpython
+The Python language bindings for the [Bitcoin Dev Kit](https://github.com/bitcoindevkit).
+
+## Install the package
+```shell
+pip install bdkpython
+```
+
+## Simple example
+```python
+import bdkpython as bdk
+"""
+
+setup(
+    name="bdkpython",
+    version="1.0.0a2.dev1",
+    description="The Python language bindings for the Bitcoin Development Kit",
+    long_description=LONG_DESCRIPTION,
+    long_description_content_type="text/markdown",
+    include_package_data = True,
+    zip_safe=False,
+    packages=["bdkpython"],
+    package_dir={"bdkpython": "./src/bdkpython"},
+    url="https://github.com/bitcoindevkit/bdk-ffi",
+    author="Bitcoin Dev Kit Developers <dev@bitcoindevkit.org>",
+    license="MIT or Apache 2.0",
+    # This is required to ensure the library name includes the python version, abi, and platform tags
+    # See issue #350 for more information
+    has_ext_modules=lambda: True,
+)

bdk-python/shell.nix

@@ -0,0 +1,17 @@
+with import <nixpkgs> {};
+
+mkShell {
+  name = "bdk-python-shell";
+  packages = [ ( import ./nix/uniffi_bindgen.nix ) ];
+  buildInputs = with python37.pkgs; [
+    pip
+    setuptools
+  ];
+  shellHook = ''
+    export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH
+    alias pip="PIP_PREFIX='$(pwd)/_build/pip_packages' \pip"
+    export PYTHONPATH="$(pwd)/_build/pip_packages/lib/python3.7/site-packages:$(pwd):$PYTHONPATH"
+    export PATH="$(pwd)/_build/pip_packages/bin:$PATH"
+    unset SOURCE_DATE_EPOCH
+  '';
+}

bdk-python/src/bdkpython/__init__.py

@@ -0,0 +1 @@
+from bdkpython.bdk import *

bdk-python/tests/test_live_tx_builder.py

@@ -0,0 +1,38 @@
+import bdkpython as bdk
+import unittest
+
+class TestLiveTxBuilder(unittest.TestCase):
+
+    def test_tx_builder(self):
+        descriptor: bdk.Descriptor = bdk.Descriptor(
+            "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)",
+            bdk.Network.TESTNET
+        )
+        wallet: bdk.Wallet = bdk.Wallet.new_no_persist(
+            descriptor,
+            None,
+            bdk.Network.TESTNET
+        )
+        esploraClient: bdk.EsploraClient = bdk.EsploraClient(url = "https://mempool.space/testnet/api")
+        update = esploraClient.scan(
+            wallet = wallet,
+            stop_gap = 10,
+            parallel_requests = 1
+        )
+        wallet.apply_update(update)
+
+        self.assertGreater(wallet.get_balance().total(), 0)
+
+        recipient = bdk.Address(
+            address = "tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989",
+            network = bdk.Network.TESTNET
+        )
+
+        psbt = bdk.TxBuilder().add_recipient(script=recipient.script_pubkey(), amount=4200).fee_rate(2.0).finish(wallet)
+        # print(psbt.serialize())
+        
+        self.assertTrue(psbt.serialize().startswith("cHNi"), "The PSBT should start with cHNi")
+
+    
+if __name__ == '__main__':
+    unittest.main()