Bump version to 0.14.0

Now works with latest released versions of rust-bitcoincore-rpc and
bitcoind. Once these crates are updated to support creating descriptor
wallets and add importdescriptors and bech32m support this test will
need to be updated.

.github/workflows/code_coverage.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions-rs/grcov@v0.1.5
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2
         with:
           file: ${{ steps.coverage.outputs.report }}
           directory: ./coverage/reports/

.github/workflows/cont_integration.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.53.0 # STABLE
+          - 1.56.0 # STABLE
           - 1.46.0 # MSRV
         features:
           - default
@@ -26,6 +26,7 @@ jobs:
           - verify
           - async-interface
           - use-esplora-reqwest
+          - sqlite
     steps:
       - name: checkout
         uses: actions/checkout@v2
@@ -78,15 +79,20 @@ jobs:
         run: cargo test --features test-md-docs --no-default-features -- doctest::ReadmeDoctests
 
   test-blockchains:
-    name: Test ${{ matrix.blockchain.name }}
+    name: Blockchain ${{ matrix.blockchain.features }}
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
         blockchain:
           - name: electrum
+            features: test-electrum
           - name: rpc
+            features: test-rpc
           - name: esplora
+            features: test-esplora,use-esplora-reqwest
+          - name: esplora
+            features: test-esplora,use-esplora-ureq    
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -95,8 +101,6 @@ jobs:
         with:
           path: |
             ~/.cargo/registry
-            ~/.cargo/bitcoin
-            ~/.cargo/electrs
             ~/.cargo/git
             target
           key: ${{ runner.os }}-cargo-${{ github.job }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
@@ -106,11 +110,11 @@ jobs:
           toolchain: stable
           override: true
       - name: Test
-        run: cargo test --features test-${{ matrix.blockchain.name }} ${{ matrix.blockchain.name }}::bdk_blockchain_tests
-
+        run: cargo test --no-default-features --features ${{ matrix.blockchain.features }} ${{ matrix.blockchain.name }}::bdk_blockchain_tests
+  
   check-wasm:
     name: Check WASM
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-20.04
     env:
       CC: clang-10
       CFLAGS: -I/usr/include
@@ -127,11 +131,11 @@ jobs:
           key: ${{ runner.os }}-cargo-${{ github.job }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
         # Install a recent version of clang that supports wasm32
       - run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
-      - run: sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main" || exit 1
+      - run: sudo apt-add-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-10 main" || exit 1
       - run: sudo apt-get update || exit 1
       - run: sudo apt-get install -y libclang-common-10-dev clang-10 libc6-dev-i386 || exit 1
       - name: Set default toolchain
-        run: rustup default 1.53.0 # STABLE
+        run: rustup default 1.56.0 # STABLE
       - name: Set profile
         run: rustup set profile minimal
       - name: Add target wasm32
@@ -141,7 +145,6 @@ jobs:
       - name: Check
         run: cargo check --target wasm32-unknown-unknown --features use-esplora-reqwest --no-default-features
 
-
   fmt:
     name: Rust fmt
     runs-on: ubuntu-latest

.github/workflows/nightly_docs.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Update toolchain
         run: rustup update
       - name: Build docs
-        run: cargo rustdoc --verbose --features=compiler,electrum,esplora,ureq,compact_filters,key-value-db,all-keys -- --cfg docsrs -Dwarnings
+        run: cargo rustdoc --verbose --features=compiler,electrum,esplora,ureq,compact_filters,key-value-db,all-keys,sqlite -- --cfg docsrs -Dwarnings
       - name: Upload artifact
         uses: actions/upload-artifact@v2
         with:

CHANGELOG.md

@@ -6,6 +6,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [v0.14.0] - [v0.13.0]
+
+- BIP39 implementation dependency, in `keys::bip39` changed from tiny-bip39 to rust-bip39.
+- Add new method on the `TxBuilder` to embed data in the transaction via `OP_RETURN`. To allow that a fix to check the dust only on spendable output has been introduced.
+- Update the `Database` trait to store the last sync timestamp and block height
+- Rename `ConfirmationTime` to `BlockTime`
+
+## [v0.13.0] - [v0.12.0]
+
+- Exposed `get_tx()` method from `Database` to `Wallet`.
+
+## [v0.12.0] - [v0.11.0]
+
+- Activate `miniscript/use-serde` feature to allow consumers of the library to access it via the re-exported `miniscript` crate.
+- Add support for proxies in `EsploraBlockchain`
+- Added `SqliteDatabase` that implements `Database` backed by a sqlite database using `rusqlite` crate.
+
+## [v0.11.0] - [v0.10.0]
+
+- Added `flush` method to the `Database` trait to explicitly flush to disk latest changes on the db.
+
 ## [v0.10.0] - [v0.9.0]
 
 - Added `RpcBlockchain` in the `AnyBlockchain` struct to allow using Rpc backend where `AnyBlockchain` is used (eg `bdk-cli`)
@@ -360,7 +381,7 @@ final transaction is created by calling `finish` on the builder.
 - Use `MemoryDatabase` in the compiler example
 - Make the REPL return JSON
 
-[unreleased]: https://github.com/bitcoindevkit/bdk/compare/v0.9.0...HEAD
+[unreleased]: https://github.com/bitcoindevkit/bdk/compare/v0.11.0...HEAD
 [0.1.0-beta.1]: https://github.com/bitcoindevkit/bdk/compare/96c87ea5...0.1.0-beta.1
 [v0.2.0]: https://github.com/bitcoindevkit/bdk/compare/0.1.0-beta.1...v0.2.0
 [v0.3.0]: https://github.com/bitcoindevkit/bdk/compare/v0.2.0...v0.3.0
@@ -372,3 +393,7 @@ final transaction is created by calling `finish` on the builder.
 [v0.8.0]: https://github.com/bitcoindevkit/bdk/compare/v0.7.0...v0.8.0
 [v0.9.0]: https://github.com/bitcoindevkit/bdk/compare/v0.8.0...v0.9.0
 [v0.10.0]: https://github.com/bitcoindevkit/bdk/compare/v0.9.0...v0.10.0
+[v0.11.0]: https://github.com/bitcoindevkit/bdk/compare/v0.10.0...v0.11.0
+[v0.12.0]: https://github.com/bitcoindevkit/bdk/compare/v0.11.0...v0.12.0
+[v0.13.0]: https://github.com/bitcoindevkit/bdk/compare/v0.12.0...v0.13.0
+[v0.14.0]: https://github.com/bitcoindevkit/bdk/compare/v0.13.0...v0.14.0

CONTRIBUTING.md

@@ -57,6 +57,21 @@ comment suggesting that you're working on it. If someone is already assigned,
 don't hesitate to ask if the assigned party or previous commenters are still
 working on it if it has been awhile.
 
+Deprecation policy
+------------------
+
+Where possible, breaking existing APIs should be avoided. Instead, add new APIs and
+use [`#[deprecated]`](https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md)
+to discourage use of the old one.
+
+Deprecated APIs are typically maintained for one release cycle. In other words, an
+API that has been deprecated with the 0.10 release can be expected to be removed in the
+0.11 release. This allows for smoother upgrades without incurring too much technical
+debt inside this library.
+
+If you deprecated an API as part of a contribution, we encourage you to "own" that API
+and send a follow-up to remove it as part of the next release cycle.
+
 Peer review
 -----------
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bdk"
-version = "0.10.0"
+version = "0.14.0"
 edition = "2018"
 authors = ["Alekos Filini <alekos.filini@gmail.com>", "Riccardo Casatta <riccardo@casatta.it>"]
 homepage = "https://bitcoindevkit.org"
@@ -12,31 +12,37 @@ readme = "README.md"
 license = "MIT OR Apache-2.0"
 
 [dependencies]
-bdk-macros = "0.5"
+bdk-macros = "^0.6"
 log = "^0.4"
-miniscript = "5.1"
-bitcoin = { version = "~0.26.2", features = ["use-serde", "base64"] }
+miniscript = { version = "^6.0", features = ["use-serde"] }
+bitcoin = { version = "^0.27", features = ["use-serde", "base64"] }
 serde = { version = "^1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }
 rand = "^0.7"
 
 # Optional dependencies
 sled = { version = "0.34", optional = true }
-electrum-client = { version = "0.7", optional = true }
+electrum-client = { version = "0.8", optional = true }
+rusqlite = { version = "0.25.3", optional = true }
+ahash = { version = "=0.7.4", optional = true }
 reqwest = { version = "0.11", optional = true, features = ["json"] }
-ureq = { version = "2.1", default-features = false, features = ["json"], optional = true }
+ureq = { version = "~2.2.0", features = ["json"], optional = true }
 futures = { version = "0.3", optional = true }
 async-trait = { version = "0.1", optional = true }
-rocksdb = { version = "0.14", optional = true }
+rocksdb = { version = "0.14", default-features = false, features = ["snappy"], optional = true }
 cc = { version = ">=1.0.64", optional = true }
 socks = { version = "0.3", optional = true }
 lazy_static = { version = "1.4", optional = true }
-tiny-bip39 = { version = "^0.8", optional = true }
-zeroize = { version = "<1.4.0", optional = true }
+
+bip39 = { version = "1.0.1", optional = true }
 bitcoinconsensus = { version = "0.19.0-3", optional = true }
 
 # Needed by bdk_blockchain_tests macro
-bitcoincore-rpc = { version = "0.13", optional = true }
+bitcoincore-rpc = { version = "0.14", optional = true }
+
+# Platform-specific dependencies
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+tokio = { version = "1", features = ["rt"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 async-trait = "0.1"
@@ -48,10 +54,11 @@ minimal = []
 compiler = ["miniscript/compiler"]
 verify = ["bitcoinconsensus"]
 default = ["key-value-db", "electrum"]
+sqlite = ["rusqlite", "ahash"]
 compact_filters = ["rocksdb", "socks", "lazy_static", "cc"]
 key-value-db = ["sled"]
 all-keys = ["keys-bip39"]
-keys-bip39 = ["tiny-bip39", "zeroize"]
+keys-bip39 = ["bip39"]
 rpc = ["bitcoincore-rpc"]
 
 # We currently provide mulitple implementations of `Blockchain`, all are
@@ -70,8 +77,8 @@ rpc = ["bitcoincore-rpc"]
 async-interface = ["async-trait"]
 electrum = ["electrum-client"]
 # MUST ALSO USE `--no-default-features`.
-use-esplora-reqwest = ["async-interface", "esplora", "reqwest", "futures"]
-use-esplora-ureq = ["esplora", "ureq"]
+use-esplora-reqwest = ["esplora", "reqwest", "reqwest/socks", "futures"]
+use-esplora-ureq = ["esplora", "ureq", "ureq/socks"]
 # Typical configurations will not need to use `esplora` feature directly.
 esplora = []
 
@@ -80,14 +87,14 @@ esplora = []
 test-blockchains = ["bitcoincore-rpc", "electrum-client"]
 test-electrum = ["electrum", "electrsd/electrs_0_8_10", "test-blockchains"]
 test-rpc = ["rpc", "electrsd/electrs_0_8_10", "test-blockchains"]
-test-esplora = ["esplora", "ureq", "electrsd/legacy", "electrsd/esplora_a33e97e1", "test-blockchains"]
+test-esplora = ["electrsd/legacy", "electrsd/esplora_a33e97e1", "test-blockchains"]
 test-md-docs = ["electrum"]
 
 [dev-dependencies]
 lazy_static = "1.4"
 env_logger = "0.7"
 clap = "2.33"
-electrsd = { version= "0.8", features = ["trigger", "bitcoind_0_21_1"] }
+electrsd = { version= "0.12", features = ["trigger", "bitcoind_22_0"] }
 
 [[example]]
 name = "address_validator"
@@ -103,6 +110,6 @@ required-features = ["compiler"]
 [workspace]
 members = ["macros"]
 [package.metadata.docs.rs]
-features = ["compiler", "electrum", "esplora", "ureq", "compact_filters", "rpc", "key-value-db", "all-keys", "verify"]
+features = ["compiler", "electrum", "esplora", "ureq", "compact_filters", "rpc", "key-value-db", "sqlite", "all-keys", "verify"]
 # defines the configuration attribute `docsrs`
 rustdoc-args = ["--cfg", "docsrs"]

DEVELOPMENT_CYCLE.md

@@ -32,14 +32,14 @@ Pre-`v1.0.0` our "major" releases only affect the "minor" semver value. Accordin
     - If it's a minor issue you can just fix it in the release branch, since it will be merged back to `master` eventually
     - For bigger issues you can fix them on `master` and then *cherry-pick* the commit to the release branch
 6. Update the changelog with the new release version.
-7. Update `src/lib.rs` with the new version (line ~59)
+7. Update `src/lib.rs` with the new version (line ~43)
 8. On release day, make a commit on the release branch to bump the version to `x.y.z`. The message should be "Bump version to x.y.z".
 9. Add a tag to this commit. The tag name should be `vx.y.z` (for example `v0.5.0`), and the message "Release x.y.z". Make sure the tag is signed, for extra safety use the explicit `--sign` flag.
 10. Push the new commits to the upstream release branch, wait for the CI to finish one last time.
 11. Publish **all** the updated crates to crates.io.
 12. Make a new commit to bump the version value to `x.y.(z+1)-dev`. The message should be "Bump version to x.y.(z+1)-dev".
 13. Merge the release branch back into `master`.
-14. If the `master` branch contains any unreleased changes to the `bdk-macros`, `bdk-testutils`, or `bdk-testutils-macros` crates, change the `bdk` Cargo.toml `[dev-dependencies]` to point to the local path (ie. `bdk-testutils-macros = { path = "./testutils-macros"}`)
+14. If the `master` branch contains any unreleased changes to the `bdk-macros` crate, change the `bdk` Cargo.toml `[dependencies]` to point to the local path (ie. `bdk-macros = { path = "./macros"}`)
 15. Create the release on GitHub: go to "tags", click on the dots on the right and select "Create Release". Then set the title to `vx.y.z` and write down some brief release notes.
 16. Make sure the new release shows up on crates.io and that the docs are built correctly on docs.rs.
 17. Announce the release on Twitter, Discord and Telegram.

examples/compiler.rs

@@ -70,7 +70,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     let policy_str = matches.value_of("POLICY").unwrap();
     info!("Compiling policy: {}", policy_str);
 
-    let policy = Concrete::<String>::from_str(&policy_str)?;
+    let policy = Concrete::<String>::from_str(policy_str)?;
 
     let descriptor = match matches.value_of("TYPE").unwrap() {
         "sh" => Descriptor::new_sh(policy.compile()?)?,

macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bdk-macros"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Alekos Filini <alekos.filini@gmail.com>"]
 edition = "2018"
 homepage = "https://bitcoindevkit.org"

macros/src/lib.rs

@@ -121,3 +121,26 @@ pub fn maybe_await(expr: TokenStream) -> TokenStream {
 
     quoted.into()
 }
+
+/// Awaits if target_arch is "wasm32", uses `tokio::Runtime::block_on()` otherwise
+///
+/// Requires the `tokio` crate as a dependecy with `rt-core` or `rt-threaded` to build on non-wasm32 platforms.
+#[proc_macro]
+pub fn await_or_block(expr: TokenStream) -> TokenStream {
+    let expr: proc_macro2::TokenStream = expr.into();
+    let quoted = quote! {
+        {
+            #[cfg(all(not(target_arch = "wasm32"), not(feature = "async-interface")))]
+            {
+                tokio::runtime::Builder::new_current_thread().enable_all().build().unwrap().block_on(#expr)
+            }
+
+            #[cfg(any(target_arch = "wasm32", feature = "async-interface"))]
+            {
+                #expr.await
+            }
+        }
+    };
+
+    quoted.into()
+}

src/blockchain/compact_filters/mod.rs

@@ -71,7 +71,7 @@ use super::{Blockchain, Capability, ConfigurableBlockchain, Progress};
 use crate::database::{BatchDatabase, BatchOperations, DatabaseUtils};
 use crate::error::Error;
 use crate::types::{KeychainKind, LocalUtxo, TransactionDetails};
-use crate::{ConfirmationTime, FeeRate};
+use crate::{BlockTime, FeeRate};
 
 use peer::*;
 use store::*;
@@ -206,7 +206,7 @@ impl CompactFiltersBlockchain {
                 transaction: Some(tx.clone()),
                 received: incoming,
                 sent: outgoing,
-                confirmation_time: ConfirmationTime::new(height, timestamp),
+                confirmation_time: BlockTime::new(height, timestamp),
                 verified: height.is_some(),
                 fee: Some(inputs_sum.saturating_sub(outputs_sum)),
             };
@@ -254,7 +254,7 @@ impl Blockchain for CompactFiltersBlockchain {
         let total_cost = headers_cost + filters_cost + PROCESS_BLOCKS_COST;
 
         if let Some(snapshot) = sync::sync_headers(
-            Arc::clone(&first_peer),
+            Arc::clone(first_peer),
             Arc::clone(&self.headers),
             |new_height| {
                 let local_headers_cost =
@@ -275,7 +275,7 @@ impl Blockchain for CompactFiltersBlockchain {
         let buried_height = synced_height.saturating_sub(sync::BURIED_CONFIRMATIONS);
         info!("Synced headers to height: {}", synced_height);
 
-        cf_sync.prepare_sync(Arc::clone(&first_peer))?;
+        cf_sync.prepare_sync(Arc::clone(first_peer))?;
 
         let all_scripts = Arc::new(
             database
@@ -294,7 +294,7 @@ impl Blockchain for CompactFiltersBlockchain {
         let mut threads = Vec::with_capacity(self.peers.len());
         for peer in &self.peers {
             let cf_sync = Arc::clone(&cf_sync);
-            let peer = Arc::clone(&peer);
+            let peer = Arc::clone(peer);
             let headers = Arc::clone(&self.headers);
             let all_scripts = Arc::clone(&all_scripts);
             let last_synced_block = Arc::clone(&last_synced_block);

src/blockchain/compact_filters/peer.rs

@@ -262,7 +262,7 @@ impl Peer {
         let message_resp = {
             let mut lock = responses.write().unwrap();
             let message_resp = lock.entry(wait_for).or_default();
-            Arc::clone(&message_resp)
+            Arc::clone(message_resp)
         };
 
         let (lock, cvar) = &*message_resp;
@@ -379,7 +379,7 @@ impl Peer {
             let message_resp = {
                 let mut lock = reader_thread_responses.write().unwrap();
                 let message_resp = lock.entry(in_message.cmd()).or_default();
-                Arc::clone(&message_resp)
+                Arc::clone(message_resp)
             };
 
             let (lock, cvar) = &*message_resp;

src/blockchain/compact_filters/store.rs

@@ -760,7 +760,7 @@ impl CfStore {
         let cf_headers: Vec<FilterHeader> = filter_hashes
             .into_iter()
             .scan(checkpoint, |prev_header, filter_hash| {
-                let filter_header = filter_hash.filter_header(&prev_header);
+                let filter_header = filter_hash.filter_header(prev_header);
                 *prev_header = filter_header;
 
                 Some(filter_header)
@@ -801,7 +801,7 @@ impl CfStore {
             .zip(headers.into_iter())
             .scan(checkpoint, |prev_header, ((_, filter_content), header)| {
                 let filter = BlockFilter::new(&filter_content);
-                if header != filter.filter_header(&prev_header) {
+                if header != filter.filter_header(prev_header) {
                     return Some(Err(CompactFiltersError::InvalidFilter));
                 }
                 *prev_header = header;

src/blockchain/compact_filters/sync.rs

@@ -205,7 +205,7 @@ impl CfSync {
                     let block_hash = self.headers_store.get_block_hash(height)?.unwrap();
 
                     // TODO: also download random blocks?
-                    if process(&block_hash, &BlockFilter::new(&filter))? {
+                    if process(&block_hash, &BlockFilter::new(filter))? {
                         log::debug!("Downloading block {}", block_hash);
 
                         let block = peer

src/blockchain/esplora/mod.rs

@@ -29,38 +29,16 @@ use bitcoin::{BlockHash, Txid};
 use crate::error::Error;
 use crate::FeeRate;
 
-#[cfg(all(
-    feature = "esplora",
-    feature = "reqwest",
-    any(feature = "async-interface", target_arch = "wasm32"),
-))]
+#[cfg(feature = "reqwest")]
 mod reqwest;
 
-#[cfg(all(
-    feature = "esplora",
-    feature = "reqwest",
-    any(feature = "async-interface", target_arch = "wasm32"),
-))]
+#[cfg(feature = "reqwest")]
 pub use self::reqwest::*;
 
-#[cfg(all(
-    feature = "esplora",
-    not(any(
-        feature = "async-interface",
-        feature = "reqwest",
-        target_arch = "wasm32"
-    )),
-))]
+#[cfg(feature = "ureq")]
 mod ureq;
 
-#[cfg(all(
-    feature = "esplora",
-    not(any(
-        feature = "async-interface",
-        feature = "reqwest",
-        target_arch = "wasm32"
-    )),
-))]
+#[cfg(feature = "ureq")]
 pub use self::ureq::*;
 
 fn into_fee_rate(target: usize, estimates: HashMap<String, f64>) -> Result<FeeRate, Error> {
@@ -141,3 +119,11 @@ impl_error!(io::Error, Io, EsploraError);
 impl_error!(std::num::ParseIntError, Parsing, EsploraError);
 impl_error!(consensus::encode::Error, BitcoinEncoding, EsploraError);
 impl_error!(bitcoin::hashes::hex::Error, Hex, EsploraError);
+
+#[cfg(test)]
+#[cfg(feature = "test-esplora")]
+crate::bdk_blockchain_tests! {
+    fn test_instance(test_client: &TestClient) -> EsploraBlockchain {
+        EsploraBlockchain::new(&format!("http://{}",test_client.electrsd.esplora_url.as_ref().unwrap()), 20)
+    }
+}

src/blockchain/esplora/reqwest.rs

@@ -106,19 +106,19 @@ impl Blockchain for EsploraBlockchain {
     }
 
     fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> {
-        Ok(self.url_client._get_tx(txid).await?)
+        Ok(await_or_block!(self.url_client._get_tx(txid))?)
     }
 
     fn broadcast(&self, tx: &Transaction) -> Result<(), Error> {
-        Ok(self.url_client._broadcast(tx).await?)
+        Ok(await_or_block!(self.url_client._broadcast(tx))?)
     }
 
     fn get_height(&self) -> Result<u32, Error> {
-        Ok(self.url_client._get_height().await?)
+        Ok(await_or_block!(self.url_client._get_height())?)
     }
 
     fn estimate_fee(&self, target: usize) -> Result<FeeRate, Error> {
-        let estimates = self.url_client._get_fee_estimates().await?;
+        let estimates = await_or_block!(self.url_client._get_fee_estimates())?;
         super::into_fee_rate(target, estimates)
     }
 }
@@ -287,10 +287,10 @@ impl ElectrumLikeSync for UrlClient {
             for script in chunk {
                 futs.push(self._script_get_history(script));
             }
-            let partial_results: Vec<Vec<ElsGetHistoryRes>> = futs.try_collect().await?;
+            let partial_results: Vec<Vec<ElsGetHistoryRes>> = await_or_block!(futs.try_collect())?;
             results.extend(partial_results);
         }
-        Ok(stream::iter(results).collect().await)
+        Ok(await_or_block!(stream::iter(results).collect()))
     }
 
     fn els_batch_transaction_get<'s, I: IntoIterator<Item = &'s Txid>>(
@@ -303,10 +303,10 @@ impl ElectrumLikeSync for UrlClient {
             for txid in chunk {
                 futs.push(self._get_tx_no_opt(txid));
             }
-            let partial_results: Vec<Transaction> = futs.try_collect().await?;
+            let partial_results: Vec<Transaction> = await_or_block!(futs.try_collect())?;
             results.extend(partial_results);
         }
-        Ok(stream::iter(results).collect().await)
+        Ok(await_or_block!(stream::iter(results).collect()))
     }
 
     fn els_batch_block_header<I: IntoIterator<Item = u32>>(
@@ -319,10 +319,10 @@ impl ElectrumLikeSync for UrlClient {
             for height in chunk {
                 futs.push(self._get_header(height));
             }
-            let partial_results: Vec<BlockHeader> = futs.try_collect().await?;
+            let partial_results: Vec<BlockHeader> = await_or_block!(futs.try_collect())?;
             results.extend(partial_results);
         }
-        Ok(stream::iter(results).collect().await)
+        Ok(await_or_block!(stream::iter(results).collect()))
     }
 }
 
@@ -333,6 +333,17 @@ pub struct EsploraBlockchainConfig {
     ///
     /// eg. `https://blockstream.info/api/`
     pub base_url: String,
+    /// Optional URL of the proxy to use to make requests to the Esplora server
+    ///
+    /// The string should be formatted as: `<protocol>://<user>:<password>@host:<port>`.
+    ///
+    /// Note that the format of this value and the supported protocols change slightly between the
+    /// sync version of esplora (using `ureq`) and the async version (using `reqwest`). For more
+    /// details check with the documentation of the two crates. Both of them are compiled with
+    /// the `socks` feature enabled.
+    ///
+    /// The proxy is ignored when targeting `wasm32`.
+    pub proxy: Option<String>,
     /// Number of parallel requests sent to the esplora service (default: 4)
     pub concurrency: Option<u8>,
     /// Stop searching addresses for transactions after finding an unused gap of this length.
@@ -343,18 +354,19 @@ impl ConfigurableBlockchain for EsploraBlockchain {
     type Config = EsploraBlockchainConfig;
 
     fn from_config(config: &Self::Config) -> Result<Self, Error> {
+        let map_e = |e: reqwest::Error| Error::Esplora(Box::new(e.into()));
+
         let mut blockchain = EsploraBlockchain::new(config.base_url.as_str(), config.stop_gap);
         if let Some(concurrency) = config.concurrency {
             blockchain.url_client.concurrency = concurrency;
-        };
+        }
+        #[cfg(not(target_arch = "wasm32"))]
+        if let Some(proxy) = &config.proxy {
+            blockchain.url_client.client = Client::builder()
+                .proxy(reqwest::Proxy::all(proxy).map_err(map_e)?)
+                .build()
+                .map_err(map_e)?;
+        }
         Ok(blockchain)
     }
 }
-
-#[cfg(test)]
-#[cfg(feature = "test-esplora")]
-crate::bdk_blockchain_tests! {
-    fn test_instance(test_client: &TestClient) -> EsploraBlockchain {
-        EsploraBlockchain::new(&format!("http://{}",test_client.electrsd.esplora_url.as_ref().unwrap()), None, 20)
-    }
-}

src/blockchain/esplora/ureq.rs

@@ -19,7 +19,7 @@ use std::time::Duration;
 #[allow(unused_imports)]
 use log::{debug, error, info, trace};
 
-use ureq::{Agent, Response};
+use ureq::{Agent, Proxy, Response};
 
 use bitcoin::consensus::{deserialize, serialize};
 use bitcoin::hashes::hex::{FromHex, ToHex};
@@ -59,7 +59,7 @@ impl std::convert::From<UrlClient> for EsploraBlockchain {
 }
 
 impl EsploraBlockchain {
-    /// Create a new instance of the client from a base URL and `stop_gap`.
+    /// Create a new instance of the client from a base URL and the `stop_gap`.
     pub fn new(base_url: &str, stop_gap: usize) -> Self {
         EsploraBlockchain {
             url_client: UrlClient {
@@ -358,6 +358,17 @@ impl ElectrumLikeSync for UrlClient {
 pub struct EsploraBlockchainConfig {
     /// Base URL of the esplora service eg. `https://blockstream.info/api/`
     pub base_url: String,
+    /// Optional URL of the proxy to use to make requests to the Esplora server
+    ///
+    /// The string should be formatted as: `<protocol>://<user>:<password>@host:<port>`.
+    ///
+    /// Note that the format of this value and the supported protocols change slightly between the
+    /// sync version of esplora (using `ureq`) and the async version (using `reqwest`). For more
+    /// details check with the documentation of the two crates. Both of them are compiled with
+    /// the `socks` feature enabled.
+    ///
+    /// The proxy is ignored when targeting `wasm32`.
+    pub proxy: Option<String>,
     /// Socket read timeout.
     pub timeout_read: u64,
     /// Socket write timeout.
@@ -370,10 +381,18 @@ impl ConfigurableBlockchain for EsploraBlockchain {
     type Config = EsploraBlockchainConfig;
 
     fn from_config(config: &Self::Config) -> Result<Self, Error> {
-        let agent: Agent = ureq::AgentBuilder::new()
+        let mut agent_builder = ureq::AgentBuilder::new()
             .timeout_read(Duration::from_secs(config.timeout_read))
-            .timeout_write(Duration::from_secs(config.timeout_write))
-            .build();
-        Ok(EsploraBlockchain::new(config.base_url.as_str(), config.stop_gap).with_agent(agent))
+            .timeout_write(Duration::from_secs(config.timeout_write));
+
+        if let Some(proxy) = &config.proxy {
+            agent_builder = agent_builder
+                .proxy(Proxy::new(proxy).map_err(|e| Error::Esplora(Box::new(e.into())))?);
+        }
+
+        Ok(
+            EsploraBlockchain::new(config.base_url.as_str(), config.stop_gap)
+                .with_agent(agent_builder.build()),
+        )
     }
 }

src/blockchain/mod.rs

@@ -201,7 +201,7 @@ impl Progress for NoopProgress {
 #[derive(Clone, Copy)]
 pub struct LogProgress;
 
-/// Create a nwe instance of [`LogProgress`]
+/// Create a new instance of [`LogProgress`]
 pub fn log_progress() -> LogProgress {
     LogProgress
 }

src/blockchain/rpc.rs

@@ -37,7 +37,7 @@ use crate::blockchain::{Blockchain, Capability, ConfigurableBlockchain, Progress
 use crate::database::{BatchDatabase, DatabaseUtils};
 use crate::descriptor::{get_checksum, IntoWalletDescriptor};
 use crate::wallet::utils::SecpCtx;
-use crate::{ConfirmationTime, Error, FeeRate, KeychainKind, LocalUtxo, TransactionDetails};
+use crate::{BlockTime, Error, FeeRate, KeychainKind, LocalUtxo, TransactionDetails};
 use bitcoincore_rpc::json::{
     GetAddressInfoResultLabel, ImportMultiOptions, ImportMultiRequest,
     ImportMultiRequestScriptPubkey, ImportMultiRescanSince,
@@ -84,7 +84,7 @@ pub struct RpcConfig {
 
 /// This struct is equivalent to [bitcoincore_rpc::Auth] but it implements [serde::Serialize]
 /// To be removed once upstream equivalent is implementing Serialize (json serialization format
-/// should be the same) https://github.com/rust-bitcoin/rust-bitcoincore-rpc/pull/181
+/// should be the same), see [rust-bitcoincore-rpc/pull/181](https://github.com/rust-bitcoin/rust-bitcoincore-rpc/pull/181)
 #[derive(Clone, Debug, Hash, Eq, PartialEq, Ord, PartialOrd, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 #[serde(untagged)]
@@ -156,7 +156,7 @@ impl Blockchain for RpcBlockchain {
             .iter()
             .map(|s| ImportMultiRequest {
                 timestamp: ImportMultiRescanSince::Timestamp(0),
-                script_pubkey: Some(ImportMultiRequestScriptPubkey::Script(&s)),
+                script_pubkey: Some(ImportMultiRequestScriptPubkey::Script(s)),
                 watchonly: Some(true),
                 ..Default::default()
             })
@@ -169,22 +169,25 @@ impl Blockchain for RpcBlockchain {
         //TODO maybe convenient using import_descriptor for compatible descriptor and import_multi as fallback
         self.client.import_multi(&requests, Some(&options))?;
 
-        let current_height = self.get_height()?;
+        loop {
+            let current_height = self.get_height()?;
 
-        // min because block invalidate may cause height to go down
-        let node_synced = self.get_node_synced_height()?.min(current_height);
+            // min because block invalidate may cause height to go down
+            let node_synced = self.get_node_synced_height()?.min(current_height);
 
-        //TODO call rescan in chunks (updating node_synced_height) so that in case of
-        // interruption work can be partially recovered
-        debug!(
-            "rescan_blockchain from:{} to:{}",
-            node_synced, current_height
-        );
-        self.client
-            .rescan_blockchain(Some(node_synced as usize), Some(current_height as usize))?;
-        progress_update.update(1.0, None)?;
+            let sync_up_to = node_synced.saturating_add(10_000).min(current_height);
 
-        self.set_node_synced_height(current_height)?;
+            debug!("rescan_blockchain from:{} to:{}", node_synced, sync_up_to);
+            self.client
+                .rescan_blockchain(Some(node_synced as usize), Some(sync_up_to as usize))?;
+            progress_update.update((sync_up_to as f32) / (current_height as f32), None)?;
+
+            self.set_node_synced_height(sync_up_to)?;
+
+            if sync_up_to == current_height {
+                break;
+            }
+        }
 
         self.sync(database, progress_update)
     }
@@ -227,7 +230,7 @@ impl Blockchain for RpcBlockchain {
             list_txs_ids.insert(txid);
             if let Some(mut known_tx) = known_txs.get_mut(&txid) {
                 let confirmation_time =
-                    ConfirmationTime::new(tx_result.info.blockheight, tx_result.info.blocktime);
+                    BlockTime::new(tx_result.info.blockheight, tx_result.info.blocktime);
                 if confirmation_time != known_tx.confirmation_time {
                     // reorg may change tx height
                     debug!(
@@ -235,7 +238,7 @@ impl Blockchain for RpcBlockchain {
                         txid, confirmation_time
                     );
                     known_tx.confirmation_time = confirmation_time;
-                    db.set_tx(&known_tx)?;
+                    db.set_tx(known_tx)?;
                 }
             } else {
                 //TODO check there is already the raw tx in db?
@@ -263,7 +266,7 @@ impl Blockchain for RpcBlockchain {
                 let td = TransactionDetails {
                     transaction: Some(tx),
                     txid: tx_result.info.txid,
-                    confirmation_time: ConfirmationTime::new(
+                    confirmation_time: BlockTime::new(
                         tx_result.info.blockheight,
                         tx_result.info.blocktime,
                     ),
@@ -357,7 +360,7 @@ impl ConfigurableBlockchain for RpcBlockchain {
         let wallet_url = format!("{}/wallet/{}", config.url, &wallet_name);
         debug!("connecting to {} auth:{:?}", wallet_url, config.auth);
 
-        let client = Client::new(wallet_url, config.auth.clone().into())?;
+        let client = Client::new(wallet_url.as_str(), config.auth.clone().into())?;
         let loaded_wallets = client.list_wallets()?;
         if loaded_wallets.contains(&wallet_name) {
             debug!("wallet already loaded {:?}", wallet_name);
@@ -424,13 +427,13 @@ where
 {
     //TODO check descriptors contains only public keys
     let descriptor = descriptor
-        .into_wallet_descriptor(&secp, network)?
+        .into_wallet_descriptor(secp, network)?
         .0
         .to_string();
     let mut wallet_name = get_checksum(&descriptor[..descriptor.find('#').unwrap()])?;
     if let Some(change_descriptor) = change_descriptor {
         let change_descriptor = change_descriptor
-            .into_wallet_descriptor(&secp, network)?
+            .into_wallet_descriptor(secp, network)?
             .0
             .to_string();
         wallet_name.push_str(

src/blockchain/utils.rs

@@ -21,7 +21,7 @@ use bitcoin::{BlockHeader, OutPoint, Script, Transaction, Txid};
 use super::*;
 use crate::database::{BatchDatabase, BatchOperations, DatabaseUtils};
 use crate::error::Error;
-use crate::types::{ConfirmationTime, KeychainKind, LocalUtxo, TransactionDetails};
+use crate::types::{BlockTime, KeychainKind, LocalUtxo, TransactionDetails};
 use crate::wallet::time::Instant;
 use crate::wallet::utils::ChunksIterator;
 
@@ -151,7 +151,7 @@ pub trait ElectrumLikeSync {
                 // check if tx height matches, otherwise updates it. timestamp is not in the if clause
                 // because we are not asking headers for confirmed tx we know about
                 if tx_details.confirmation_time.as_ref().map(|c| c.height) != height {
-                    let confirmation_time = ConfirmationTime::new(height, timestamp);
+                    let confirmation_time = BlockTime::new(height, timestamp);
                     let mut new_tx_details = tx_details.clone();
                     new_tx_details.confirmation_time = confirmation_time;
                     batch.set_tx(&new_tx_details)?;
@@ -359,7 +359,7 @@ fn save_transaction_details_and_utxos<D: BatchDatabase>(
         transaction: Some(tx),
         received: incoming,
         sent: outgoing,
-        confirmation_time: ConfirmationTime::new(height, timestamp),
+        confirmation_time: BlockTime::new(height, timestamp),
         fee: Some(inputs_sum.saturating_sub(outputs_sum)), /* if the tx is a coinbase, fees would be negative */
         verified: height.is_some(),
     };

src/database/any.rs

@@ -65,6 +65,8 @@ macro_rules! impl_inner_method {
             $enum_name::Memory(inner) => inner.$name( $($args, )* ),
             #[cfg(feature = "key-value-db")]
             $enum_name::Sled(inner) => inner.$name( $($args, )* ),
+            #[cfg(feature = "sqlite")]
+            $enum_name::Sqlite(inner) => inner.$name( $($args, )* ),
         }
     }
 }
@@ -82,10 +84,15 @@ pub enum AnyDatabase {
     #[cfg_attr(docsrs, doc(cfg(feature = "key-value-db")))]
     /// Simple key-value embedded database based on [`sled`]
     Sled(sled::Tree),
+    #[cfg(feature = "sqlite")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "sqlite")))]
+    /// Sqlite embedded database using [`rusqlite`]
+    Sqlite(sqlite::SqliteDatabase),
 }
 
 impl_from!(memory::MemoryDatabase, AnyDatabase, Memory,);
 impl_from!(sled::Tree, AnyDatabase, Sled, #[cfg(feature = "key-value-db")]);
+impl_from!(sqlite::SqliteDatabase, AnyDatabase, Sqlite, #[cfg(feature = "sqlite")]);
 
 /// Type that contains any of the [`BatchDatabase::Batch`] types defined by the library
 pub enum AnyBatch {
@@ -95,6 +102,10 @@ pub enum AnyBatch {
     #[cfg_attr(docsrs, doc(cfg(feature = "key-value-db")))]
     /// Simple key-value embedded database based on [`sled`]
     Sled(<sled::Tree as BatchDatabase>::Batch),
+    #[cfg(feature = "sqlite")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "sqlite")))]
+    /// Sqlite embedded database using [`rusqlite`]
+    Sqlite(<sqlite::SqliteDatabase as BatchDatabase>::Batch),
 }
 
 impl_from!(
@@ -103,6 +114,7 @@ impl_from!(
     Memory,
 );
 impl_from!(<sled::Tree as BatchDatabase>::Batch, AnyBatch, Sled, #[cfg(feature = "key-value-db")]);
+impl_from!(<sqlite::SqliteDatabase as BatchDatabase>::Batch, AnyBatch, Sqlite, #[cfg(feature = "sqlite")]);
 
 impl BatchOperations for AnyDatabase {
     fn set_script_pubkey(
@@ -132,6 +144,9 @@ impl BatchOperations for AnyDatabase {
     fn set_last_index(&mut self, keychain: KeychainKind, value: u32) -> Result<(), Error> {
         impl_inner_method!(AnyDatabase, self, set_last_index, keychain, value)
     }
+    fn set_sync_time(&mut self, sync_time: SyncTime) -> Result<(), Error> {
+        impl_inner_method!(AnyDatabase, self, set_sync_time, sync_time)
+    }
 
     fn del_script_pubkey_from_path(
         &mut self,
@@ -168,6 +183,9 @@ impl BatchOperations for AnyDatabase {
     fn del_last_index(&mut self, keychain: KeychainKind) -> Result<Option<u32>, Error> {
         impl_inner_method!(AnyDatabase, self, del_last_index, keychain)
     }
+    fn del_sync_time(&mut self) -> Result<Option<SyncTime>, Error> {
+        impl_inner_method!(AnyDatabase, self, del_sync_time)
+    }
 }
 
 impl Database for AnyDatabase {
@@ -229,10 +247,17 @@ impl Database for AnyDatabase {
     fn get_last_index(&self, keychain: KeychainKind) -> Result<Option<u32>, Error> {
         impl_inner_method!(AnyDatabase, self, get_last_index, keychain)
     }
+    fn get_sync_time(&self) -> Result<Option<SyncTime>, Error> {
+        impl_inner_method!(AnyDatabase, self, get_sync_time)
+    }
 
     fn increment_last_index(&mut self, keychain: KeychainKind) -> Result<u32, Error> {
         impl_inner_method!(AnyDatabase, self, increment_last_index, keychain)
     }
+
+    fn flush(&mut self) -> Result<(), Error> {
+        impl_inner_method!(AnyDatabase, self, flush)
+    }
 }
 
 impl BatchOperations for AnyBatch {
@@ -256,6 +281,9 @@ impl BatchOperations for AnyBatch {
     fn set_last_index(&mut self, keychain: KeychainKind, value: u32) -> Result<(), Error> {
         impl_inner_method!(AnyBatch, self, set_last_index, keychain, value)
     }
+    fn set_sync_time(&mut self, sync_time: SyncTime) -> Result<(), Error> {
+        impl_inner_method!(AnyBatch, self, set_sync_time, sync_time)
+    }
 
     fn del_script_pubkey_from_path(
         &mut self,
@@ -286,6 +314,9 @@ impl BatchOperations for AnyBatch {
     fn del_last_index(&mut self, keychain: KeychainKind) -> Result<Option<u32>, Error> {
         impl_inner_method!(AnyBatch, self, del_last_index, keychain)
     }
+    fn del_sync_time(&mut self) -> Result<Option<SyncTime>, Error> {
+        impl_inner_method!(AnyBatch, self, del_sync_time)
+    }
 }
 
 impl BatchDatabase for AnyDatabase {
@@ -296,19 +327,26 @@ impl BatchDatabase for AnyDatabase {
             AnyDatabase::Memory(inner) => inner.begin_batch().into(),
             #[cfg(feature = "key-value-db")]
             AnyDatabase::Sled(inner) => inner.begin_batch().into(),
+            #[cfg(feature = "sqlite")]
+            AnyDatabase::Sqlite(inner) => inner.begin_batch().into(),
         }
     }
     fn commit_batch(&mut self, batch: Self::Batch) -> Result<(), Error> {
         match self {
             AnyDatabase::Memory(db) => match batch {
                 AnyBatch::Memory(batch) => db.commit_batch(batch),
-                #[cfg(feature = "key-value-db")]
-                _ => unimplemented!("Sled batch shouldn't be used with Memory db."),
+                #[cfg(any(feature = "key-value-db", feature = "sqlite"))]
+                _ => unimplemented!("Other batch shouldn't be used with Memory db."),
             },
             #[cfg(feature = "key-value-db")]
             AnyDatabase::Sled(db) => match batch {
                 AnyBatch::Sled(batch) => db.commit_batch(batch),
-                _ => unimplemented!("Memory batch shouldn't be used with Sled db."),
+                _ => unimplemented!("Other batch shouldn't be used with Sled db."),
+            },
+            #[cfg(feature = "sqlite")]
+            AnyDatabase::Sqlite(db) => match batch {
+                AnyBatch::Sqlite(batch) => db.commit_batch(batch),
+                _ => unimplemented!("Other batch shouldn't be used with Sqlite db."),
             },
         }
     }
@@ -333,6 +371,23 @@ impl ConfigurableDatabase for sled::Tree {
     }
 }
 
+/// Configuration type for a [`sqlite::SqliteDatabase`] database
+#[cfg(feature = "sqlite")]
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct SqliteDbConfiguration {
+    /// Main directory of the db
+    pub path: String,
+}
+
+#[cfg(feature = "sqlite")]
+impl ConfigurableDatabase for sqlite::SqliteDatabase {
+    type Config = SqliteDbConfiguration;
+
+    fn from_config(config: &Self::Config) -> Result<Self, Error> {
+        Ok(sqlite::SqliteDatabase::new(config.path.clone()))
+    }
+}
+
 /// Type that can contain any of the database configurations defined by the library
 ///
 /// This allows storing a single configuration that can be loaded into an [`AnyDatabase`]
@@ -346,6 +401,10 @@ pub enum AnyDatabaseConfig {
     #[cfg_attr(docsrs, doc(cfg(feature = "key-value-db")))]
     /// Simple key-value embedded database based on [`sled`]
     Sled(SledDbConfiguration),
+    #[cfg(feature = "sqlite")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "sqlite")))]
+    /// Sqlite embedded database using [`rusqlite`]
+    Sqlite(SqliteDbConfiguration),
 }
 
 impl ConfigurableDatabase for AnyDatabase {
@@ -358,9 +417,14 @@ impl ConfigurableDatabase for AnyDatabase {
             }
             #[cfg(feature = "key-value-db")]
             AnyDatabaseConfig::Sled(inner) => AnyDatabase::Sled(sled::Tree::from_config(inner)?),
+            #[cfg(feature = "sqlite")]
+            AnyDatabaseConfig::Sqlite(inner) => {
+                AnyDatabase::Sqlite(sqlite::SqliteDatabase::from_config(inner)?)
+            }
         })
     }
 }
 
 impl_from!((), AnyDatabaseConfig, Memory,);
 impl_from!(SledDbConfiguration, AnyDatabaseConfig, Sled, #[cfg(feature = "key-value-db")]);
+impl_from!(SqliteDbConfiguration, AnyDatabaseConfig, Sqlite, #[cfg(feature = "sqlite")]);

src/database/keyvalue.rs

@@ -18,7 +18,7 @@ use bitcoin::hash_types::Txid;
 use bitcoin::{OutPoint, Script, Transaction};
 
 use crate::database::memory::MapKey;
-use crate::database::{BatchDatabase, BatchOperations, Database};
+use crate::database::{BatchDatabase, BatchOperations, Database, SyncTime};
 use crate::error::Error;
 use crate::types::*;
 
@@ -82,6 +82,13 @@ macro_rules! impl_batch_operations {
             Ok(())
         }
 
+        fn set_sync_time(&mut self, data: SyncTime) -> Result<(), Error> {
+            let key = MapKey::SyncTime.as_map_key();
+            self.insert(key, serde_json::to_vec(&data)?)$($after_insert)*;
+
+            Ok(())
+        }
+
         fn del_script_pubkey_from_path(&mut self, keychain: KeychainKind, path: u32) -> Result<Option<Script>, Error> {
             let key = MapKey::Path((Some(keychain), Some(path))).as_map_key();
             let res = self.remove(key);
@@ -168,6 +175,14 @@ macro_rules! impl_batch_operations {
                 }
             }
         }
+
+        fn del_sync_time(&mut self) -> Result<Option<SyncTime>, Error> {
+            let key = MapKey::SyncTime.as_map_key();
+            let res = self.remove(key);
+            let res = $process_delete!(res);
+
+            Ok(res.map(|b| serde_json::from_slice(&b)).transpose()?)
+        }
     }
 }
 
@@ -342,6 +357,14 @@ impl Database for Tree {
             .transpose()
     }
 
+    fn get_sync_time(&self) -> Result<Option<SyncTime>, Error> {
+        let key = MapKey::SyncTime.as_map_key();
+        Ok(self
+            .get(key)?
+            .map(|b| serde_json::from_slice(&b))
+            .transpose()?)
+    }
+
     // inserts 0 if not present
     fn increment_last_index(&mut self, keychain: KeychainKind) -> Result<u32, Error> {
         let key = MapKey::LastIndex(keychain).as_map_key();
@@ -367,6 +390,10 @@ impl Database for Tree {
             Ok(val)
         })
     }
+
+    fn flush(&mut self) -> Result<(), Error> {
+        Ok(Tree::flush(self).map(|_| ())?)
+    }
 }
 
 impl BatchDatabase for Tree {
@@ -466,4 +493,9 @@ mod test {
     fn test_last_index() {
         crate::database::test::test_last_index(get_tree());
     }
+
+    #[test]
+    fn test_sync_time() {
+        crate::database::test::test_sync_time(get_tree());
+    }
 }

src/database/memory.rs

@@ -14,6 +14,7 @@
 //! This module defines an in-memory database type called [`MemoryDatabase`] that is based on a
 //! [`BTreeMap`].
 
+use std::any::Any;
 use std::collections::BTreeMap;
 use std::ops::Bound::{Excluded, Included};
 
@@ -21,7 +22,7 @@ use bitcoin::consensus::encode::{deserialize, serialize};
 use bitcoin::hash_types::Txid;
 use bitcoin::{OutPoint, Script, Transaction};
 
-use crate::database::{BatchDatabase, BatchOperations, ConfigurableDatabase, Database};
+use crate::database::{BatchDatabase, BatchOperations, ConfigurableDatabase, Database, SyncTime};
 use crate::error::Error;
 use crate::types::*;
 
@@ -32,6 +33,7 @@ use crate::types::*;
 // transactions         t<txid> -> tx details
 // deriv indexes        c{i,e} -> u32
 // descriptor checksum  d{i,e} -> vec<u8>
+// last sync time       l -> { height, timestamp }
 
 pub(crate) enum MapKey<'a> {
     Path((Option<KeychainKind>, Option<u32>)),
@@ -40,6 +42,7 @@ pub(crate) enum MapKey<'a> {
     RawTx(Option<&'a Txid>),
     Transaction(Option<&'a Txid>),
     LastIndex(KeychainKind),
+    SyncTime,
     DescriptorChecksum(KeychainKind),
 }
 
@@ -58,6 +61,7 @@ impl MapKey<'_> {
             MapKey::RawTx(_) => b"r".to_vec(),
             MapKey::Transaction(_) => b"t".to_vec(),
             MapKey::LastIndex(st) => [b"c", st.as_ref()].concat(),
+            MapKey::SyncTime => b"l".to_vec(),
             MapKey::DescriptorChecksum(st) => [b"d", st.as_ref()].concat(),
         }
     }
@@ -110,7 +114,7 @@ fn after(key: &[u8]) -> Vec<u8> {
 /// [`database`]: crate::database
 #[derive(Debug, Default)]
 pub struct MemoryDatabase {
-    map: BTreeMap<Vec<u8>, Box<dyn std::any::Any>>,
+    map: BTreeMap<Vec<u8>, Box<dyn Any + Send + Sync>>,
     deleted_keys: Vec<Vec<u8>>,
 }
 
@@ -179,6 +183,12 @@ impl BatchOperations for MemoryDatabase {
 
         Ok(())
     }
+    fn set_sync_time(&mut self, data: SyncTime) -> Result<(), Error> {
+        let key = MapKey::SyncTime.as_map_key();
+        self.map.insert(key, Box::new(data));
+
+        Ok(())
+    }
 
     fn del_script_pubkey_from_path(
         &mut self,
@@ -269,6 +279,13 @@ impl BatchOperations for MemoryDatabase {
             Some(b) => Ok(Some(*b.downcast_ref().unwrap())),
         }
     }
+    fn del_sync_time(&mut self) -> Result<Option<SyncTime>, Error> {
+        let key = MapKey::SyncTime.as_map_key();
+        let res = self.map.remove(&key);
+        self.deleted_keys.push(key);
+
+        Ok(res.map(|b| b.downcast_ref().cloned().unwrap()))
+    }
 }
 
 impl Database for MemoryDatabase {
@@ -406,6 +423,14 @@ impl Database for MemoryDatabase {
         Ok(self.map.get(&key).map(|b| *b.downcast_ref().unwrap()))
     }
 
+    fn get_sync_time(&self) -> Result<Option<SyncTime>, Error> {
+        let key = MapKey::SyncTime.as_map_key();
+        Ok(self
+            .map
+            .get(&key)
+            .map(|b| b.downcast_ref().cloned().unwrap()))
+    }
+
     // inserts 0 if not present
     fn increment_last_index(&mut self, keychain: KeychainKind) -> Result<u32, Error> {
         let key = MapKey::LastIndex(keychain).as_map_key();
@@ -419,6 +444,10 @@ impl Database for MemoryDatabase {
 
         Ok(*value)
     }
+
+    fn flush(&mut self) -> Result<(), Error> {
+        Ok(())
+    }
 }
 
 impl BatchDatabase for MemoryDatabase {
@@ -452,20 +481,21 @@ impl ConfigurableDatabase for MemoryDatabase {
 /// don't have `test` set.
 macro_rules! populate_test_db {
     ($db:expr, $tx_meta:expr, $current_height:expr$(,)?) => {{
+        use std::str::FromStr;
         use $crate::database::BatchOperations;
         let mut db = $db;
         let tx_meta = $tx_meta;
         let current_height: Option<u32> = $current_height;
-        let tx = Transaction {
+        let tx = $crate::bitcoin::Transaction {
             version: 1,
             lock_time: 0,
             input: vec![],
             output: tx_meta
                 .output
                 .iter()
-                .map(|out_meta| bitcoin::TxOut {
+                .map(|out_meta| $crate::bitcoin::TxOut {
                     value: out_meta.value,
-                    script_pubkey: bitcoin::Address::from_str(&out_meta.to_address)
+                    script_pubkey: $crate::bitcoin::Address::from_str(&out_meta.to_address)
                         .unwrap()
                         .script_pubkey(),
                 })
@@ -473,12 +503,12 @@ macro_rules! populate_test_db {
         };
 
         let txid = tx.txid();
-        let confirmation_time = tx_meta.min_confirmations.map(|conf| ConfirmationTime {
+        let confirmation_time = tx_meta.min_confirmations.map(|conf| $crate::BlockTime {
             height: current_height.unwrap().checked_sub(conf as u32).unwrap(),
             timestamp: 0,
         });
 
-        let tx_details = TransactionDetails {
+        let tx_details = $crate::TransactionDetails {
             transaction: Some(tx.clone()),
             txid,
             fee: Some(0),
@@ -490,13 +520,13 @@ macro_rules! populate_test_db {
 
         db.set_tx(&tx_details).unwrap();
         for (vout, out) in tx.output.iter().enumerate() {
-            db.set_utxo(&LocalUtxo {
+            db.set_utxo(&$crate::LocalUtxo {
                 txout: out.clone(),
-                outpoint: OutPoint {
+                outpoint: $crate::bitcoin::OutPoint {
                     txid,
                     vout: vout as u32,
                 },
-                keychain: KeychainKind::External,
+                keychain: $crate::KeychainKind::External,
             })
             .unwrap();
         }
@@ -582,4 +612,9 @@ mod test {
     fn test_last_index() {
         crate::database::test::test_last_index(get_tree());
     }
+
+    #[test]
+    fn test_sync_time() {
+        crate::database::test::test_sync_time(get_tree());
+    }
 }

src/database/mod.rs

@@ -24,6 +24,8 @@
 //!
 //! [`Wallet`]: crate::wallet::Wallet
 
+use serde::{Deserialize, Serialize};
+
 use bitcoin::hash_types::Txid;
 use bitcoin::{OutPoint, Script, Transaction, TxOut};
 
@@ -36,9 +38,23 @@ pub use any::{AnyDatabase, AnyDatabaseConfig};
 #[cfg(feature = "key-value-db")]
 pub(crate) mod keyvalue;
 
+#[cfg(feature = "sqlite")]
+pub(crate) mod sqlite;
+#[cfg(feature = "sqlite")]
+pub use sqlite::SqliteDatabase;
+
 pub mod memory;
 pub use memory::MemoryDatabase;
 
+/// Blockchain state at the time of syncing
+///
+/// Contains only the block time and height at the moment
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct SyncTime {
+    /// Block timestamp and height at the time of sync
+    pub block_time: BlockTime,
+}
+
 /// Trait for operations that can be batched
 ///
 /// This trait defines the list of operations that must be implemented on the [`Database`] type and
@@ -59,6 +75,8 @@ pub trait BatchOperations {
     fn set_tx(&mut self, transaction: &TransactionDetails) -> Result<(), Error>;
     /// Store the last derivation index for a given keychain.
     fn set_last_index(&mut self, keychain: KeychainKind, value: u32) -> Result<(), Error>;
+    /// Store the sync time
+    fn set_sync_time(&mut self, sync_time: SyncTime) -> Result<(), Error>;
 
     /// Delete a script_pubkey given the keychain and its child number.
     fn del_script_pubkey_from_path(
@@ -84,6 +102,10 @@ pub trait BatchOperations {
     ) -> Result<Option<TransactionDetails>, Error>;
     /// Delete the last derivation index for a keychain.
     fn del_last_index(&mut self, keychain: KeychainKind) -> Result<Option<u32>, Error>;
+    /// Reset the sync time to `None`
+    ///
+    /// Returns the removed value
+    fn del_sync_time(&mut self) -> Result<Option<SyncTime>, Error>;
 }
 
 /// Trait for reading data from a database
@@ -129,11 +151,16 @@ pub trait Database: BatchOperations {
     fn get_tx(&self, txid: &Txid, include_raw: bool) -> Result<Option<TransactionDetails>, Error>;
     /// Return the last defivation index for a keychain.
     fn get_last_index(&self, keychain: KeychainKind) -> Result<Option<u32>, Error>;
+    /// Return the sync time, if present
+    fn get_sync_time(&self) -> Result<Option<SyncTime>, Error>;
 
     /// Increment the last derivation index for a keychain and return it
     ///
     /// It should insert and return `0` if not present in the database
     fn increment_last_index(&mut self, keychain: KeychainKind) -> Result<u32, Error>;
+
+    /// Force changes to be written to disk
+    fn flush(&mut self) -> Result<(), Error>;
 }
 
 /// Trait for a database that supports batch operations
@@ -317,7 +344,7 @@ pub mod test {
             received: 1337,
             sent: 420420,
             fee: Some(140),
-            confirmation_time: Some(ConfirmationTime {
+            confirmation_time: Some(BlockTime {
                 timestamp: 123456,
                 height: 1000,
             }),
@@ -369,5 +396,25 @@ pub mod test {
         );
     }
 
+    pub fn test_sync_time<D: Database>(mut tree: D) {
+        assert!(tree.get_sync_time().unwrap().is_none());
+
+        tree.set_sync_time(SyncTime {
+            block_time: BlockTime {
+                height: 100,
+                timestamp: 1000,
+            },
+        })
+        .unwrap();
+
+        let extracted = tree.get_sync_time().unwrap();
+        assert!(extracted.is_some());
+        assert_eq!(extracted.as_ref().unwrap().block_time.height, 100);
+        assert_eq!(extracted.as_ref().unwrap().block_time.timestamp, 1000);
+
+        tree.del_sync_time().unwrap();
+        assert!(tree.get_sync_time().unwrap().is_none());
+    }
+
     // TODO: more tests...
 }

src/descriptor/dsl.rs

@@ -571,8 +571,9 @@ macro_rules! fragment {
     ( pk ( $key:expr ) ) => ({
         $crate::fragment!(c:pk_k ( $key ))
     });
-    ( pk_h ( $key_hash:expr ) ) => ({
-        $crate::impl_leaf_opcode_value!(PkH, $key_hash)
+    ( pk_h ( $key:expr ) ) => ({
+        let secp = $crate::bitcoin::secp256k1::Secp256k1::new();
+        $crate::keys::make_pkh($key, &secp)
     });
     ( after ( $value:expr ) ) => ({
         $crate::impl_leaf_opcode_value!(After, $value)
@@ -601,6 +602,9 @@ macro_rules! fragment {
     ( and_or ( $( $inner:tt )* ) ) => ({
         $crate::impl_node_opcode_three!(AndOr, $( $inner )*)
     });
+    ( andor ( $( $inner:tt )* ) ) => ({
+        $crate::impl_node_opcode_three!(AndOr, $( $inner )*)
+    });
     ( or_b ( $( $inner:tt )* ) ) => ({
         $crate::impl_node_opcode_two!(OrB, $( $inner )*)
     });

src/descriptor/policy.rs

@@ -47,14 +47,12 @@ use bitcoin::util::bip32::Fingerprint;
 use bitcoin::PublicKey;
 
 use miniscript::descriptor::{DescriptorPublicKey, ShInner, SortedMultiVec, WshInner};
-use miniscript::{
-    Descriptor, Miniscript, MiniscriptKey, Satisfier, ScriptContext, Terminal, ToPublicKey,
-};
+use miniscript::{Descriptor, Miniscript, MiniscriptKey, Satisfier, ScriptContext, Terminal};
 
 #[allow(unused_imports)]
 use log::{debug, error, info, trace};
 
-use crate::descriptor::{DerivedDescriptorKey, ExtractPolicy};
+use crate::descriptor::ExtractPolicy;
 use crate::wallet::signer::{SignerId, SignersContainer};
 use crate::wallet::utils::{self, After, Older, SecpCtx};
 
@@ -88,13 +86,6 @@ impl PkOrF {
             },
         }
     }
-
-    fn from_key_hash(k: hash160::Hash) -> Self {
-        PkOrF {
-            pubkey_hash: Some(k),
-            ..Default::default()
-        }
-    }
 }
 
 /// An item that needs to be satisfied
@@ -779,25 +770,6 @@ fn signature_in_psbt(psbt: &Psbt, key: &DescriptorPublicKey, secp: &SecpCtx) ->
     })
 }
 
-fn signature_key(
-    key: &<DescriptorPublicKey as MiniscriptKey>::Hash,
-    signers: &SignersContainer,
-    secp: &SecpCtx,
-) -> Policy {
-    let key_hash = DerivedDescriptorKey::new(key.clone(), secp)
-        .to_public_key()
-        .to_pubkeyhash();
-    let mut policy: Policy = SatisfiableItem::Signature(PkOrF::from_key_hash(key_hash)).into();
-
-    if signers.find(SignerId::PkHash(key_hash)).is_some() {
-        policy.contribution = Satisfaction::Complete {
-            condition: Default::default(),
-        }
-    }
-
-    policy
-}
-
 impl<Ctx: ScriptContext> ExtractPolicy for Miniscript<DescriptorPublicKey, Ctx> {
     fn extract_policy(
         &self,
@@ -809,7 +781,7 @@ impl<Ctx: ScriptContext> ExtractPolicy for Miniscript<DescriptorPublicKey, Ctx>
             // Leaves
             Terminal::True | Terminal::False => None,
             Terminal::PkK(pubkey) => Some(signature(pubkey, signers, build_sat, secp)),
-            Terminal::PkH(pubkey_hash) => Some(signature_key(pubkey_hash, signers, secp)),
+            Terminal::PkH(pubkey_hash) => Some(signature(pubkey_hash, signers, build_sat, secp)),
             Terminal::After(value) => {
                 let mut policy: Policy = SatisfiableItem::AbsoluteTimelock { value: *value }.into();
                 policy.contribution = Satisfaction::Complete {
@@ -1444,6 +1416,7 @@ mod test {
 
     const ALICE_TPRV_STR:&str = "tprv8ZgxMBicQKsPf6T5X327efHnvJDr45Xnb8W4JifNWtEoqXu9MRYS4v1oYe6DFcMVETxy5w3bqpubYRqvcVTqovG1LifFcVUuJcbwJwrhYzP";
     const BOB_TPRV_STR:&str = "tprv8ZgxMBicQKsPeinZ155cJAn117KYhbaN6MV3WeG6sWhxWzcvX1eg1awd4C9GpUN1ncLEM2rzEvunAg3GizdZD4QPPCkisTz99tXXB4wZArp";
+    const CAROL_TPRV_STR:&str = "tprv8ZgxMBicQKsPdC3CicFifuLCEyVVdXVUNYorxUWj3iGZ6nimnLAYAY9SYB7ib8rKzRxrCKFcEytCt6szwd2GHnGPRCBLAEAoSVDefSNk4Bt";
     const ALICE_BOB_PATH: &str = "m/0'";
 
     #[test]
@@ -1602,4 +1575,28 @@ mod test {
         );
         //println!("{}", serde_json::to_string(&policy_expired_signed).unwrap());
     }
+
+    #[test]
+    fn test_extract_pkh() {
+        let secp = Secp256k1::new();
+
+        let (prvkey_alice, _, _) = setup_keys(ALICE_TPRV_STR, ALICE_BOB_PATH, &secp);
+        let (prvkey_bob, _, _) = setup_keys(BOB_TPRV_STR, ALICE_BOB_PATH, &secp);
+        let (prvkey_carol, _, _) = setup_keys(CAROL_TPRV_STR, ALICE_BOB_PATH, &secp);
+
+        let desc = descriptor!(wsh(c: andor(
+            pk(prvkey_alice),
+            pk_k(prvkey_bob),
+            pk_h(prvkey_carol),
+        )))
+        .unwrap();
+
+        let (wallet_desc, keymap) = desc
+            .into_wallet_descriptor(&secp, Network::Testnet)
+            .unwrap();
+        let signers_container = Arc::new(SignersContainer::from(keymap));
+
+        let policy = wallet_desc.extract_policy(&signers_container, BuildSatisfaction::None, &secp);
+        assert!(policy.is_ok());
+    }
 }

src/error.rs

@@ -140,6 +140,9 @@ pub enum Error {
     #[cfg(feature = "rpc")]
     /// Rpc client error
     Rpc(bitcoincore_rpc::Error),
+    #[cfg(feature = "sqlite")]
+    /// Rusqlite client error
+    Rusqlite(rusqlite::Error),
 }
 
 impl fmt::Display for Error {
@@ -194,6 +197,8 @@ impl_error!(electrum_client::Error, Electrum);
 impl_error!(sled::Error, Sled);
 #[cfg(feature = "rpc")]
 impl_error!(bitcoincore_rpc::Error, Rpc);
+#[cfg(feature = "sqlite")]
+impl_error!(rusqlite::Error, Rusqlite);
 
 #[cfg(feature = "compact_filters")]
 impl From<crate::blockchain::compact_filters::CompactFiltersError> for Error {

src/keys/bip39.rs

@@ -19,7 +19,23 @@ use bitcoin::Network;
 
 use miniscript::ScriptContext;
 
-pub use bip39::{Language, Mnemonic, MnemonicType, Seed};
+pub use bip39::{Language, Mnemonic};
+
+type Seed = [u8; 64];
+
+/// Type describing entropy length (aka word count) in the mnemonic
+pub enum WordCount {
+    /// 12 words mnemonic (128 bits entropy)
+    Words12 = 128,
+    /// 15 words mnemonic (160 bits entropy)
+    Words15 = 160,
+    /// 18 words mnemonic (192 bits entropy)
+    Words18 = 192,
+    /// 21 words mnemonic (224 bits entropy)
+    Words21 = 224,
+    /// 24 words mnemonic (256 bits entropy)
+    Words24 = 256,
+}
 
 use super::{
     any_network, DerivableKey, DescriptorKey, ExtendedKey, GeneratableKey, GeneratedKey, KeyError,
@@ -40,7 +56,7 @@ pub type MnemonicWithPassphrase = (Mnemonic, Option<String>);
 #[cfg_attr(docsrs, doc(cfg(feature = "keys-bip39")))]
 impl<Ctx: ScriptContext> DerivableKey<Ctx> for Seed {
     fn into_extended_key(self) -> Result<ExtendedKey<Ctx>, KeyError> {
-        Ok(bip32::ExtendedPrivKey::new_master(Network::Bitcoin, &self.as_bytes())?.into())
+        Ok(bip32::ExtendedPrivKey::new_master(Network::Bitcoin, &self[..])?.into())
     }
 
     fn into_descriptor_key(
@@ -60,7 +76,7 @@ impl<Ctx: ScriptContext> DerivableKey<Ctx> for Seed {
 impl<Ctx: ScriptContext> DerivableKey<Ctx> for MnemonicWithPassphrase {
     fn into_extended_key(self) -> Result<ExtendedKey<Ctx>, KeyError> {
         let (mnemonic, passphrase) = self;
-        let seed = Seed::new(&mnemonic, passphrase.as_deref().unwrap_or(""));
+        let seed: Seed = mnemonic.to_seed(passphrase.as_deref().unwrap_or(""));
 
         seed.into_extended_key()
     }
@@ -101,15 +117,15 @@ impl<Ctx: ScriptContext> DerivableKey<Ctx> for Mnemonic {
 impl<Ctx: ScriptContext> GeneratableKey<Ctx> for Mnemonic {
     type Entropy = [u8; 32];
 
-    type Options = (MnemonicType, Language);
-    type Error = Option<bip39::ErrorKind>;
+    type Options = (WordCount, Language);
+    type Error = Option<bip39::Error>;
 
     fn generate_with_entropy(
-        (mnemonic_type, language): Self::Options,
+        (word_count, language): Self::Options,
         entropy: Self::Entropy,
     ) -> Result<GeneratedKey<Self, Ctx>, Self::Error> {
-        let entropy = &entropy.as_ref()[..(mnemonic_type.entropy_bits() / 8)];
-        let mnemonic = Mnemonic::from_entropy(entropy, language).map_err(|e| e.downcast().ok())?;
+        let entropy = &entropy.as_ref()[..(word_count as usize / 8)];
+        let mnemonic = Mnemonic::from_entropy_in(language, entropy)?;
 
         Ok(GeneratedKey::new(mnemonic, any_network()))
     }
@@ -121,15 +137,17 @@ mod test {
 
     use bitcoin::util::bip32;
 
-    use bip39::{Language, Mnemonic, MnemonicType};
+    use bip39::{Language, Mnemonic};
 
     use crate::keys::{any_network, GeneratableKey, GeneratedKey};
 
+    use super::WordCount;
+
     #[test]
     fn test_keys_bip39_mnemonic() {
         let mnemonic =
             "aim bunker wash balance finish force paper analyst cabin spoon stable organ";
-        let mnemonic = Mnemonic::from_phrase(mnemonic, Language::English).unwrap();
+        let mnemonic = Mnemonic::parse_in(Language::English, mnemonic).unwrap();
         let path = bip32::DerivationPath::from_str("m/44'/0'/0'/0").unwrap();
 
         let key = (mnemonic, path);
@@ -143,7 +161,7 @@ mod test {
     fn test_keys_bip39_mnemonic_passphrase() {
         let mnemonic =
             "aim bunker wash balance finish force paper analyst cabin spoon stable organ";
-        let mnemonic = Mnemonic::from_phrase(mnemonic, Language::English).unwrap();
+        let mnemonic = Mnemonic::parse_in(Language::English, mnemonic).unwrap();
         let path = bip32::DerivationPath::from_str("m/44'/0'/0'/0").unwrap();
 
         let key = ((mnemonic, Some("passphrase".into())), path);
@@ -157,7 +175,7 @@ mod test {
     fn test_keys_generate_bip39() {
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
             Mnemonic::generate_with_entropy(
-                (MnemonicType::Words12, Language::English),
+                (WordCount::Words12, Language::English),
                 crate::keys::test::TEST_ENTROPY,
             )
             .unwrap();
@@ -169,7 +187,7 @@ mod test {
 
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
             Mnemonic::generate_with_entropy(
-                (MnemonicType::Words24, Language::English),
+                (WordCount::Words24, Language::English),
                 crate::keys::test::TEST_ENTROPY,
             )
             .unwrap();
@@ -180,11 +198,11 @@ mod test {
     #[test]
     fn test_keys_generate_bip39_random() {
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
-            Mnemonic::generate((MnemonicType::Words12, Language::English)).unwrap();
+            Mnemonic::generate((WordCount::Words12, Language::English)).unwrap();
         assert_eq!(generated_mnemonic.valid_networks, any_network());
 
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
-            Mnemonic::generate((MnemonicType::Words24, Language::English)).unwrap();
+            Mnemonic::generate((WordCount::Words24, Language::English)).unwrap();
         assert_eq!(generated_mnemonic.valid_networks, any_network());
     }
 }

src/keys/mod.rs

@@ -460,9 +460,9 @@ use bdk::keys::bip39::{Mnemonic, Language};
 
 # fn main() -> Result<(), Box<dyn std::error::Error>> {
 let xkey: ExtendedKey =
-    Mnemonic::from_phrase(
+    Mnemonic::parse_in(
+        Language::English,
         "jelly crash boy whisper mouse ecology tuna soccer memory million news short",
-        Language::English
     )?
     .into_extended_key()?;
 let xprv = xkey.into_xprv(Network::Bitcoin).unwrap();
@@ -753,6 +753,20 @@ pub fn make_pk<Pk: IntoDescriptorKey<Ctx>, Ctx: ScriptContext>(
     Ok((minisc, key_map, valid_networks))
 }
 
+// Used internally by `bdk::fragment!` to build `pk_h()` fragments
+#[doc(hidden)]
+pub fn make_pkh<Pk: IntoDescriptorKey<Ctx>, Ctx: ScriptContext>(
+    descriptor_key: Pk,
+    secp: &SecpCtx,
+) -> Result<(Miniscript<DescriptorPublicKey, Ctx>, KeyMap, ValidNetworks), DescriptorError> {
+    let (key, key_map, valid_networks) = descriptor_key.into_descriptor_key()?.extract(secp)?;
+    let minisc = Miniscript::from_ast(Terminal::PkH(key))?;
+
+    minisc.check_minsicript()?;
+
+    Ok((minisc, key_map, valid_networks))
+}
+
 // Used internally by `bdk::fragment!` to build `multi()` fragments
 #[doc(hidden)]
 pub fn make_multi<Pk: IntoDescriptorKey<Ctx>, Ctx: ScriptContext>(

src/lib.rs

@@ -40,7 +40,7 @@
 //! interact with the bitcoin P2P network.
 //!
 //! ```toml
-//! bdk = "0.10.0"
+//! bdk = "0.14.0"
 //! ```
 #![cfg_attr(
     feature = "electrum",
@@ -244,6 +244,9 @@ pub extern crate electrum_client;
 #[cfg(feature = "key-value-db")]
 pub extern crate sled;
 
+#[cfg(feature = "sqlite")]
+pub extern crate rusqlite;
+
 #[allow(unused_imports)]
 #[macro_use]
 pub(crate) mod error;

src/psbt/mod.rs

@@ -43,8 +43,8 @@ impl PsbtUtils for Psbt {
 mod test {
     use crate::bitcoin::TxIn;
     use crate::psbt::Psbt;
-    use crate::wallet::test::{get_funded_wallet, get_test_wpkh};
     use crate::wallet::AddressIndex;
+    use crate::wallet::{get_funded_wallet, test::get_test_wpkh};
     use crate::SignOptions;
     use std::str::FromStr;
 

src/testutils/blockchain_tests.rs

@@ -7,10 +7,10 @@ pub use bitcoincore_rpc::bitcoincore_rpc_json::AddressType;
 pub use bitcoincore_rpc::{Auth, Client as RpcClient, RpcApi};
 use core::str::FromStr;
 use electrsd::bitcoind::BitcoinD;
-use electrsd::{bitcoind, Conf, ElectrsD};
+use electrsd::{bitcoind, ElectrsD};
 pub use electrum_client::{Client as ElectrumClient, ElectrumApi};
 #[allow(unused_imports)]
-use log::{debug, error, info, trace};
+use log::{debug, error, info, log_enabled, trace, Level};
 use std::collections::HashMap;
 use std::env;
 use std::ops::Deref;
@@ -24,14 +24,15 @@ pub struct TestClient {
 impl TestClient {
     pub fn new(bitcoind_exe: String, electrs_exe: String) -> Self {
         debug!("launching {} and {}", &bitcoind_exe, &electrs_exe);
-        let bitcoind = BitcoinD::new(bitcoind_exe).unwrap();
 
-        let http_enabled = cfg!(feature = "test-esplora");
+        let mut conf = bitcoind::Conf::default();
+        conf.view_stdout = log_enabled!(Level::Debug);
+        let bitcoind = BitcoinD::with_conf(bitcoind_exe, &conf).unwrap();
+
+        let mut conf = electrsd::Conf::default();
+        conf.view_stderr = log_enabled!(Level::Debug);
+        conf.http_enabled = cfg!(feature = "test-esplora");
 
-        let conf = Conf {
-            http_enabled,
-            ..Default::default()
-        };
         let electrsd = ElectrsD::with_conf(electrs_exe, &bitcoind, &conf).unwrap();
 
         let node_address = bitcoind.client.get_new_address(None, None).unwrap();
@@ -144,9 +145,7 @@ impl TestClient {
 
         let bumped: serde_json::Value = self.call("bumpfee", &[txid.to_string().into()]).unwrap();
         let new_txid = Txid::from_str(&bumped["txid"].as_str().unwrap().to_string()).unwrap();
-
-        let monitor_script =
-            tx.vout[0].script_pub_key.addresses.as_ref().unwrap()[0].script_pubkey();
+        let monitor_script = Script::from_hex(&mut tx.vout[0].script_pub_key.hex.to_hex()).unwrap();
         self.wait_for_tx(new_txid, &monitor_script);
 
         debug!("Bumped {}, new txid {}", txid, new_txid);
@@ -393,6 +392,9 @@ macro_rules! bdk_blockchain_tests {
 
             #[test]
             fn test_sync_simple() {
+                use std::ops::Deref;
+                use crate::database::Database;
+
                 let (wallet, descriptors, mut test_client) = init_single_sig();
 
                 let tx = testutils! {
@@ -401,7 +403,13 @@ macro_rules! bdk_blockchain_tests {
                 println!("{:?}", tx);
                 let txid = test_client.receive(tx);
 
+                // the RPC blockchain needs to call `sync()` during initialization to import the
+                // addresses (see `init_single_sig()`), so we skip this assertion
+                #[cfg(not(feature = "test-rpc"))]
+                assert!(wallet.database().deref().get_sync_time().unwrap().is_none(), "initial sync_time not none");
+
                 wallet.sync(noop_progress(), None).unwrap();
+                assert!(wallet.database().deref().get_sync_time().unwrap().is_some(), "sync_time hasn't been updated");
 
                 assert_eq!(wallet.get_balance().unwrap(), 50_000, "incorrect balance");
                 assert_eq!(wallet.list_unspent().unwrap()[0].keychain, KeychainKind::External, "incorrect keychain kind");
@@ -593,7 +601,7 @@ macro_rules! bdk_blockchain_tests {
                 assert!(finalized, "Cannot finalize transaction");
                 let tx = psbt.extract_tx();
                 println!("{}", bitcoin::consensus::encode::serialize_hex(&tx));
-                wallet.broadcast(tx).unwrap();
+                wallet.broadcast(&tx).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), details.received, "incorrect balance after send");
 
@@ -644,7 +652,7 @@ macro_rules! bdk_blockchain_tests {
 
                 let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                let sent_txid = wallet.broadcast(psbt.extract_tx()).unwrap();
+                let sent_txid = wallet.broadcast(&psbt.extract_tx()).unwrap();
 
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), details.received, "incorrect balance after receive");
@@ -687,7 +695,7 @@ macro_rules! bdk_blockchain_tests {
                     let (mut psbt, details) = builder.finish().unwrap();
                     let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                     assert!(finalized, "Cannot finalize transaction");
-                    wallet.broadcast(psbt.extract_tx()).unwrap();
+                    wallet.broadcast(&psbt.extract_tx()).unwrap();
 
                     wallet.sync(noop_progress(), None).unwrap();
 
@@ -726,7 +734,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut psbt, details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(psbt.extract_tx()).unwrap();
+                wallet.broadcast(&psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 50_000 - details.fee.unwrap_or(0) - 5_000, "incorrect balance from fees");
                 assert_eq!(wallet.get_balance().unwrap(), details.received, "incorrect balance from received");
@@ -736,7 +744,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut new_psbt, new_details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut new_psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(new_psbt.extract_tx()).unwrap();
+                wallet.broadcast(&new_psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 50_000 - new_details.fee.unwrap_or(0) - 5_000, "incorrect balance from fees after bump");
                 assert_eq!(wallet.get_balance().unwrap(), new_details.received, "incorrect balance from received after bump");
@@ -761,7 +769,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut psbt, details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(psbt.extract_tx()).unwrap();
+                wallet.broadcast(&psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 1_000 - details.fee.unwrap_or(0), "incorrect balance after send");
                 assert_eq!(wallet.get_balance().unwrap(), details.received, "incorrect received after send");
@@ -771,7 +779,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut new_psbt, new_details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut new_psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(new_psbt.extract_tx()).unwrap();
+                wallet.broadcast(&new_psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 0, "incorrect balance after change removal");
                 assert_eq!(new_details.received, 0, "incorrect received after change removal");
@@ -796,7 +804,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut psbt, details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(psbt.extract_tx()).unwrap();
+                wallet.broadcast(&psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 26_000 - details.fee.unwrap_or(0), "incorrect balance after send");
                 assert_eq!(details.received, 1_000 - details.fee.unwrap_or(0), "incorrect received after send");
@@ -806,7 +814,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut new_psbt, new_details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut new_psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(new_psbt.extract_tx()).unwrap();
+                wallet.broadcast(&new_psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(new_details.sent, 75_000, "incorrect sent");
                 assert_eq!(wallet.get_balance().unwrap(), new_details.received, "incorrect balance after add input");
@@ -829,7 +837,7 @@ macro_rules! bdk_blockchain_tests {
                 let (mut psbt, details) = builder.finish().unwrap();
                 let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(psbt.extract_tx()).unwrap();
+                wallet.broadcast(&psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(wallet.get_balance().unwrap(), 26_000 - details.fee.unwrap_or(0), "incorrect balance after send");
                 assert_eq!(details.received, 1_000 - details.fee.unwrap_or(0), "incorrect received after send");
@@ -841,13 +849,44 @@ macro_rules! bdk_blockchain_tests {
 
                 let finalized = wallet.sign(&mut new_psbt, Default::default()).unwrap();
                 assert!(finalized, "Cannot finalize transaction");
-                wallet.broadcast(new_psbt.extract_tx()).unwrap();
+                wallet.broadcast(&new_psbt.extract_tx()).unwrap();
                 wallet.sync(noop_progress(), None).unwrap();
                 assert_eq!(new_details.sent, 75_000, "incorrect sent");
                 assert_eq!(wallet.get_balance().unwrap(), 0, "incorrect balance after add input");
                 assert_eq!(new_details.received, 0, "incorrect received after add input");
             }
 
+
+            #[test]
+            fn test_add_data() {
+                let (wallet, descriptors, mut test_client) = init_single_sig();
+                let node_addr = test_client.get_node_address(None);
+                let _ = test_client.receive(testutils! {
+                    @tx ( (@external descriptors, 0) => 50_000 )
+                });
+
+                wallet.sync(noop_progress(), None).unwrap();
+                assert_eq!(wallet.get_balance().unwrap(), 50_000, "incorrect balance");
+
+                let mut builder = wallet.build_tx();
+                let data = [42u8;80];
+                builder.add_data(&data);
+                let (mut psbt, details) = builder.finish().unwrap();
+
+                let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
+                assert!(finalized, "Cannot finalize transaction");
+                let tx = psbt.extract_tx();
+                let serialized_tx = bitcoin::consensus::encode::serialize(&tx);
+                assert!(serialized_tx.windows(data.len()).any(|e| e==data), "cannot find op_return data in transaction");
+                let sent_txid = wallet.broadcast(&tx).unwrap();
+                test_client.generate(1, Some(node_addr));
+                wallet.sync(noop_progress(), None).unwrap();
+                assert_eq!(wallet.get_balance().unwrap(), 50_000 - details.fee.unwrap_or(0), "incorrect balance after send");
+
+                let tx_map = wallet.list_transactions(false).unwrap().into_iter().map(|tx| (tx.txid, tx)).collect::<std::collections::HashMap<_, _>>();
+                let _ = tx_map.get(&sent_txid).unwrap();
+            }
+
             #[test]
             fn test_sync_receive_coinbase() {
                 let (wallet, _, mut test_client) = init_single_sig();
@@ -870,6 +909,102 @@ macro_rules! bdk_blockchain_tests {
                 wallet.sync(noop_progress(), None).unwrap();
                 assert!(wallet.get_balance().unwrap() > 0, "incorrect balance after receiving coinbase");
             }
+
+            #[test]
+            fn test_send_to_bech32m_addr() {
+                use std::str::FromStr;
+                use serde;
+                use serde_json;
+                use serde::Serialize;
+                use bitcoincore_rpc::jsonrpc::serde_json::Value;
+                use bitcoincore_rpc::{Auth, Client, RpcApi};
+
+                let (wallet, descriptors, mut test_client) = init_single_sig();
+
+                // TODO remove once rust-bitcoincore-rpc with PR 199 released
+                // https://github.com/rust-bitcoin/rust-bitcoincore-rpc/pull/199
+                /// Import Descriptor Request
+                #[derive(Serialize, Clone, PartialEq, Eq, Debug)]
+                pub struct ImportDescriptorRequest {
+                    pub active: bool,
+                    #[serde(rename = "desc")]
+                    pub descriptor: String,
+                    pub range: [i64; 2],
+                    pub next_index: i64,
+                    pub timestamp: String,
+                    pub internal: bool,
+                }
+
+                // TODO remove once rust-bitcoincore-rpc with PR 199 released
+                impl ImportDescriptorRequest {
+                    /// Create a new Import Descriptor request providing just the descriptor and internal flags
+                    pub fn new(descriptor: &str, internal: bool) -> Self {
+                        ImportDescriptorRequest {
+                            descriptor: descriptor.to_string(),
+                            internal,
+                            active: true,
+                            range: [0, 100],
+                            next_index: 0,
+                            timestamp: "now".to_string(),
+                        }
+                    }
+                }
+
+                // 1. Create and add descriptors to a test bitcoind node taproot wallet
+
+                // TODO replace once rust-bitcoincore-rpc with PR 174 released
+                // https://github.com/rust-bitcoin/rust-bitcoincore-rpc/pull/174
+                let _createwallet_result: Value = test_client.bitcoind.client.call("createwallet", &["taproot_wallet".into(),false.into(),true.into(),serde_json::to_value("").unwrap(), false.into(), true.into()]).unwrap();
+
+                // TODO replace once bitcoind released with support for rust-bitcoincore-rpc PR 174
+                let taproot_wallet_client = Client::new(&test_client.bitcoind.rpc_url_with_wallet("taproot_wallet"), Auth::CookieFile(test_client.bitcoind.params.cookie_file.clone())).unwrap();
+
+                let wallet_descriptor = "tr(tprv8ZgxMBicQKsPdBtxmEMPnNq58KGusNAimQirKFHqX2yk2D8q1v6pNLiKYVAdzDHy2w3vF4chuGfMvNtzsbTTLVXBcdkCA1rje1JG6oksWv8/86h/1h/0h/0/*)#y283ssmn";
+                let change_descriptor = "tr(tprv8ZgxMBicQKsPdBtxmEMPnNq58KGusNAimQirKFHqX2yk2D8q1v6pNLiKYVAdzDHy2w3vF4chuGfMvNtzsbTTLVXBcdkCA1rje1JG6oksWv8/86h/1h/0h/1/*)#47zsd9tt";
+
+                let tr_descriptors = vec![
+                            ImportDescriptorRequest::new(wallet_descriptor, false),
+                            ImportDescriptorRequest::new(change_descriptor, false),
+                        ];
+
+                // TODO replace once rust-bitcoincore-rpc with PR 199 released
+                let _import_result: Value = taproot_wallet_client.call("importdescriptors", &[serde_json::to_value(tr_descriptors).unwrap()]).unwrap();
+
+                // 2. Get a new bech32m address from test bitcoind node taproot wallet
+
+                // TODO replace once rust-bitcoincore-rpc with PR 199 released
+                let node_addr: bitcoin::Address = taproot_wallet_client.call("getnewaddress", &["test address".into(), "bech32m".into()]).unwrap();
+                assert_eq!(node_addr, bitcoin::Address::from_str("bcrt1pj5y3f0fu4y7g98k4v63j9n0xvj3lmln0cpwhsjzknm6nt0hr0q7qnzwsy9").unwrap());
+
+                // 3. Send 50_000 sats from test bitcoind node to test BDK wallet
+
+                test_client.receive(testutils! {
+                    @tx ( (@external descriptors, 0) => 50_000 )
+                });
+
+                wallet.sync(noop_progress(), None).unwrap();
+                assert_eq!(wallet.get_balance().unwrap(), 50_000, "wallet has incorrect balance");
+
+                // 4. Send 25_000 sats from test BDK wallet to test bitcoind node taproot wallet
+
+                let mut builder = wallet.build_tx();
+                builder.add_recipient(node_addr.script_pubkey(), 25_000);
+                let (mut psbt, details) = builder.finish().unwrap();
+                let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
+                assert!(finalized, "wallet cannot finalize transaction");
+                let tx = psbt.extract_tx();
+                wallet.broadcast(&tx).unwrap();
+                wallet.sync(noop_progress(), None).unwrap();
+                assert_eq!(wallet.get_balance().unwrap(), details.received, "wallet has incorrect balance after send");
+                assert_eq!(wallet.list_transactions(false).unwrap().len(), 2, "wallet has incorrect number of txs");
+                assert_eq!(wallet.list_unspent().unwrap().len(), 1, "wallet has incorrect number of unspents");
+                test_client.generate(1, None);
+
+                // 5. Verify 25_000 sats are received by test bitcoind node taproot wallet
+
+                let taproot_balance = taproot_wallet_client.get_balance(None, None).unwrap();
+                assert_eq!(taproot_balance.as_sat(), 25_000, "node has incorrect taproot wallet balance");
+            }
         }
     };
 

src/testutils/mod.rs

@@ -100,8 +100,8 @@ impl TranslateDescriptor for Descriptor<DescriptorPublicKey> {
 #[macro_export]
 macro_rules! testutils {
     ( @external $descriptors:expr, $child:expr ) => ({
-        use bitcoin::secp256k1::Secp256k1;
-        use miniscript::descriptor::{Descriptor, DescriptorPublicKey, DescriptorTrait};
+        use $crate::bitcoin::secp256k1::Secp256k1;
+        use $crate::miniscript::descriptor::{Descriptor, DescriptorPublicKey, DescriptorTrait};
 
         use $crate::testutils::TranslateDescriptor;
 
@@ -111,15 +111,15 @@ macro_rules! testutils {
         parsed.derive_translated(&secp, $child).address(bitcoin::Network::Regtest).expect("No address form")
     });
     ( @internal $descriptors:expr, $child:expr ) => ({
-        use bitcoin::secp256k1::Secp256k1;
-        use miniscript::descriptor::{Descriptor, DescriptorPublicKey, DescriptorTrait};
+        use $crate::bitcoin::secp256k1::Secp256k1;
+        use $crate::miniscript::descriptor::{Descriptor, DescriptorPublicKey, DescriptorTrait};
 
         use $crate::testutils::TranslateDescriptor;
 
         let secp = Secp256k1::new();
 
         let parsed = Descriptor::<DescriptorPublicKey>::parse_descriptor(&secp, &$descriptors.1.expect("Missing internal descriptor")).expect("Failed to parse descriptor in `testutils!(@internal)`").0;
-        parsed.derive_translated(&secp, $child).address(bitcoin::Network::Regtest).expect("No address form")
+        parsed.derive_translated(&secp, $child).address($crate::bitcoin::Network::Regtest).expect("No address form")
     });
     ( @e $descriptors:expr, $child:expr ) => ({ testutils!(@external $descriptors, $child) });
     ( @i $descriptors:expr, $child:expr ) => ({ testutils!(@internal $descriptors, $child) });
@@ -145,8 +145,8 @@ macro_rules! testutils {
         let mut seed = [0u8; 32];
         rand::thread_rng().fill(&mut seed[..]);
 
-        let key = bitcoin::util::bip32::ExtendedPrivKey::new_master(
-            bitcoin::Network::Testnet,
+        let key = $crate::bitcoin::util::bip32::ExtendedPrivKey::new_master(
+            $crate::bitcoin::Network::Testnet,
             &seed,
         );
 
@@ -158,13 +158,13 @@ macro_rules! testutils {
     ( @generate_wif ) => ({
         use rand::Rng;
 
-        let mut key = [0u8; bitcoin::secp256k1::constants::SECRET_KEY_SIZE];
+        let mut key = [0u8; $crate::bitcoin::secp256k1::constants::SECRET_KEY_SIZE];
         rand::thread_rng().fill(&mut key[..]);
 
-        (bitcoin::PrivateKey {
+        ($crate::bitcoin::PrivateKey {
             compressed: true,
-            network: bitcoin::Network::Testnet,
-            key: bitcoin::secp256k1::SecretKey::from_slice(&key).unwrap(),
+            network: $crate::bitcoin::Network::Testnet,
+            key: $crate::bitcoin::secp256k1::SecretKey::from_slice(&key).unwrap(),
         }.to_string(), None::<String>, None::<String>)
     });
 
@@ -181,8 +181,8 @@ macro_rules! testutils {
     ( @descriptors ( $external_descriptor:expr ) $( ( $internal_descriptor:expr ) )? $( ( @keys $( $keys:tt )* ) )* ) => ({
         use std::str::FromStr;
         use std::collections::HashMap;
-        use miniscript::descriptor::Descriptor;
-        use miniscript::TranslatePk;
+        use $crate::miniscript::descriptor::Descriptor;
+        use $crate::miniscript::TranslatePk;
 
         #[allow(unused_assignments, unused_mut)]
         let mut keys: HashMap<&'static str, (String, Option<String>, Option<String>)> = HashMap::new();

src/types.rs

@@ -210,7 +210,7 @@ pub struct TransactionDetails {
     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<ConfirmationTime>,
+    pub confirmation_time: Option<BlockTime>,
     /// Whether the tx has been verified against the consensus rules
     ///
     /// Confirmed txs are considered "verified" by default, while unconfirmed txs are checked to
@@ -222,20 +222,26 @@ pub struct TransactionDetails {
     pub verified: bool,
 }
 
-/// Block height and timestamp of the block containing the confirmed transaction
+/// Block height and timestamp of a block
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Default)]
-pub struct ConfirmationTime {
+pub struct BlockTime {
     /// confirmation block height
     pub height: u32,
     /// confirmation block timestamp
     pub timestamp: u64,
 }
 
-impl ConfirmationTime {
-    /// Returns `Some` `ConfirmationTime` if both `height` and `timestamp` are `Some`
+/// **DEPRECATED**: Confirmation time of a transaction
+///
+/// The structure has been renamed to `BlockTime`
+#[deprecated(note = "This structure has been renamed to `BlockTime`")]
+pub type ConfirmationTime = BlockTime;
+
+impl BlockTime {
+    /// Returns `Some` `BlockTime` if both `height` and `timestamp` are `Some`
     pub fn new(height: Option<u32>, timestamp: Option<u64>) -> Option<Self> {
         match (height, timestamp) {
-            (Some(height), Some(timestamp)) => Some(ConfirmationTime { height, timestamp }),
+            (Some(height), Some(timestamp)) => Some(BlockTime { height, timestamp }),
             _ => None,
         }
     }

src/wallet/address_validator.rs

@@ -115,8 +115,8 @@ mod test {
     use std::sync::Arc;
 
     use super::*;
-    use crate::wallet::test::{get_funded_wallet, get_test_wpkh};
     use crate::wallet::AddressIndex::New;
+    use crate::wallet::{get_funded_wallet, test::get_test_wpkh};
 
     #[derive(Debug)]
     struct TestValidator;

src/wallet/export.rs

@@ -212,7 +212,7 @@ mod test {
     use crate::database::{memory::MemoryDatabase, BatchOperations};
     use crate::types::TransactionDetails;
     use crate::wallet::Wallet;
-    use crate::ConfirmationTime;
+    use crate::BlockTime;
 
     fn get_test_db() -> MemoryDatabase {
         let mut db = MemoryDatabase::new();
@@ -226,7 +226,7 @@ mod test {
             received: 100_000,
             sent: 0,
             fee: Some(500),
-            confirmation_time: Some(ConfirmationTime {
+            confirmation_time: Some(BlockTime {
                 timestamp: 12345678,
                 height: 5000,
             }),

src/wallet/mod.rs

@@ -18,6 +18,7 @@ use std::collections::HashMap;
 use std::collections::{BTreeMap, HashSet};
 use std::fmt;
 use std::ops::{Deref, DerefMut};
+use std::str::FromStr;
 use std::sync::Arc;
 
 use bitcoin::secp256k1::Secp256k1;
@@ -55,7 +56,8 @@ use tx_builder::{BumpFee, CreateTx, FeePolicy, TxBuilder, TxParams};
 use utils::{check_nlocktime, check_nsequence_rbf, After, Older, SecpCtx, DUST_LIMIT_SATOSHI};
 
 use crate::blockchain::{Blockchain, Progress};
-use crate::database::{BatchDatabase, BatchOperations, DatabaseUtils};
+use crate::database::memory::MemoryDatabase;
+use crate::database::{BatchDatabase, BatchOperations, DatabaseUtils, SyncTime};
 use crate::descriptor::derived::AsDerived;
 use crate::descriptor::policy::BuildSatisfaction;
 use crate::descriptor::{
@@ -66,6 +68,7 @@ use crate::descriptor::{
 use crate::error::Error;
 use crate::psbt::PsbtUtils;
 use crate::signer::SignerError;
+use crate::testutils;
 use crate::types::*;
 
 const CACHE_ADDR_BATCH_SIZE: u32 = 100;
@@ -167,6 +170,11 @@ where
             secp,
         })
     }
+
+    /// Get the Bitcoin network the wallet is using.
+    pub fn network(&self) -> Network {
+        self.network
+    }
 }
 
 /// The address index selection strategy to use to derived an address from the wallet's external
@@ -315,7 +323,7 @@ where
 
     /// Return the list of unspent outputs of this wallet
     ///
-    /// Note that this methods only operate on the internal database, which first needs to be
+    /// Note that this method only operates on the internal database, which first needs to be
     /// [`Wallet::sync`] manually.
     pub fn list_unspent(&self) -> Result<Vec<LocalUtxo>, Error> {
         self.database.borrow().iter_utxos()
@@ -327,6 +335,21 @@ where
         self.database.borrow().get_utxo(&outpoint)
     }
 
+    /// Return a single transactions made and received by the wallet
+    ///
+    /// Optionally fill the [`TransactionDetails::transaction`] field with the raw transaction if
+    /// `include_raw` is `true`.
+    ///
+    /// Note that this method only operates on the internal database, which first needs to be
+    /// [`Wallet::sync`] manually.
+    pub fn get_tx(
+        &self,
+        txid: &Txid,
+        include_raw: bool,
+    ) -> Result<Option<TransactionDetails>, Error> {
+        self.database.borrow().get_tx(txid, include_raw)
+    }
+
     /// Return the list of transactions made and received by the wallet
     ///
     /// Optionally fill the [`TransactionDetails::transaction`] field with the raw transaction if
@@ -578,7 +601,7 @@ where
         let recipients = params.recipients.iter().map(|(r, v)| (r, *v));
 
         for (index, (script_pubkey, value)) in recipients.enumerate() {
-            if value.is_dust() {
+            if value.is_dust() && !script_pubkey.is_provably_unspendable() {
                 return Err(Error::OutputBelowDustLimit(index));
             }
 
@@ -1424,6 +1447,11 @@ where
 
         Ok(())
     }
+
+    /// Return an immutable reference to the internal database
+    pub fn database(&self) -> impl std::ops::Deref<Target = D> + '_ {
+        self.database.borrow()
+    }
 }
 
 impl<B, D> Wallet<B, D>
@@ -1526,6 +1554,15 @@ where
             }
         }
 
+        let sync_time = SyncTime {
+            block_time: BlockTime {
+                height: maybe_await!(self.client.get_height())?,
+                timestamp: time::get_timestamp(),
+            },
+        };
+        debug!("Saving `sync_time` = {:?}", sync_time);
+        self.database.borrow_mut().set_sync_time(sync_time)?;
+
         Ok(())
     }
 
@@ -1534,33 +1571,69 @@ where
         &self.client
     }
 
-    /// Get the Bitcoin network the wallet is using.
-    pub fn network(&self) -> Network {
-        self.network
-    }
-
     /// Broadcast a transaction to the network
     #[maybe_async]
-    pub fn broadcast(&self, tx: Transaction) -> Result<Txid, Error> {
-        maybe_await!(self.client.broadcast(&tx))?;
+    pub fn broadcast(&self, tx: &Transaction) -> Result<Txid, Error> {
+        maybe_await!(self.client.broadcast(tx))?;
 
         Ok(tx.txid())
     }
 }
 
+/// Return a fake wallet that appears to be funded for testing.
+pub fn get_funded_wallet(
+    descriptor: &str,
+) -> (
+    Wallet<(), MemoryDatabase>,
+    (String, Option<String>),
+    bitcoin::Txid,
+) {
+    let descriptors = testutils!(@descriptors (descriptor));
+    let wallet = Wallet::new_offline(
+        &descriptors.0,
+        None,
+        Network::Regtest,
+        MemoryDatabase::new(),
+    )
+    .unwrap();
+
+    let funding_address_kix = 0;
+
+    let tx_meta = testutils! {
+            @tx ( (@external descriptors, funding_address_kix) => 50_000 ) (@confirmations 1)
+    };
+
+    wallet
+        .database
+        .borrow_mut()
+        .set_script_pubkey(
+            &bitcoin::Address::from_str(&tx_meta.output.get(0).unwrap().to_address)
+                .unwrap()
+                .script_pubkey(),
+            KeychainKind::External,
+            funding_address_kix,
+        )
+        .unwrap();
+    wallet
+        .database
+        .borrow_mut()
+        .set_last_index(KeychainKind::External, funding_address_kix)
+        .unwrap();
+
+    let txid = crate::populate_test_db!(wallet.database.borrow_mut(), tx_meta, Some(100));
+
+    (wallet, descriptors, txid)
+}
+
 #[cfg(test)]
 pub(crate) mod test {
-    use std::str::FromStr;
-
     use bitcoin::{util::psbt, Network};
 
-    use crate::database::memory::MemoryDatabase;
     use crate::database::Database;
     use crate::types::KeychainKind;
 
     use super::*;
     use crate::signer::{SignOptions, SignerError};
-    use crate::testutils;
     use crate::wallet::AddressIndex::{LastUnused, New, Peek, Reset};
 
     #[test]
@@ -1672,50 +1745,6 @@ pub(crate) mod test {
         "wsh(and_v(v:pk(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW),after(100000)))"
     }
 
-    pub(crate) fn get_funded_wallet(
-        descriptor: &str,
-    ) -> (
-        Wallet<(), MemoryDatabase>,
-        (String, Option<String>),
-        bitcoin::Txid,
-    ) {
-        let descriptors = testutils!(@descriptors (descriptor));
-        let wallet = Wallet::new_offline(
-            &descriptors.0,
-            None,
-            Network::Regtest,
-            MemoryDatabase::new(),
-        )
-        .unwrap();
-
-        let funding_address_kix = 0;
-
-        let tx_meta = testutils! {
-                @tx ( (@external descriptors, funding_address_kix) => 50_000 ) (@confirmations 1)
-        };
-
-        wallet
-            .database
-            .borrow_mut()
-            .set_script_pubkey(
-                &bitcoin::Address::from_str(&tx_meta.output.get(0).unwrap().to_address)
-                    .unwrap()
-                    .script_pubkey(),
-                KeychainKind::External,
-                funding_address_kix,
-            )
-            .unwrap();
-        wallet
-            .database
-            .borrow_mut()
-            .set_last_index(KeychainKind::External, funding_address_kix)
-            .unwrap();
-
-        let txid = crate::populate_test_db!(wallet.database.borrow_mut(), tx_meta, Some(100));
-
-        (wallet, descriptors, txid)
-    }
-
     macro_rules! assert_fee_rate {
         ($tx:expr, $fees:expr, $fee_rate:expr $( ,@dust_change $( $dust_change:expr )* )* $( ,@add_signature $( $add_signature:expr )* )* ) => ({
             let mut tx = $tx.clone();
@@ -2763,7 +2792,7 @@ pub(crate) mod test {
         let txid = tx.txid();
         // skip saving the utxos, we know they can't be used anyways
         details.transaction = Some(tx);
-        details.confirmation_time = Some(ConfirmationTime {
+        details.confirmation_time = Some(BlockTime {
             timestamp: 12345678,
             height: 42,
         });
@@ -3965,4 +3994,15 @@ pub(crate) mod test {
             }
         );
     }
+
+    #[test]
+    fn test_sending_to_bip350_bech32m_address() {
+        let (wallet, _, _) = get_funded_wallet(get_test_wpkh());
+        let addr =
+            Address::from_str("tb1pqqqqp399et2xygdj5xreqhjjvcmzhxw4aywxecjdzew6hylgvsesf3hn0c")
+                .unwrap();
+        let mut builder = wallet.build_tx();
+        builder.add_recipient(addr.script_pubkey(), 45_000);
+        builder.finish().unwrap();
+    }
 }

src/wallet/tx_builder.rs

@@ -560,6 +560,13 @@ impl<'a, B, D: BatchDatabase, Cs: CoinSelectionAlgorithm<D>> TxBuilder<'a, B, D,
         self
     }
 
+    /// Add data as an output, using OP_RETURN
+    pub fn add_data(&mut self, data: &[u8]) -> &mut Self {
+        let script = Script::new_op_return(data);
+        self.add_recipient(script, 0u64);
+        self
+    }
+
     /// Sets the address to *drain* excess coins to.
     ///
     /// Usually, when there are excess coins they are sent to a change address generated by the