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bip-0370: say what the Input Finalizer keeps in a version 2 input

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BIP 174 tells the Input Finalizer to clear all other data except the
UTXO and unknown fields from a finalized input. It was written when the
unsigned transaction was a global field. PSBTv2 moves the data that
defines the input into the input map, and a finalizer that follows the
sentence literally removes it: without PSBT_IN_PREVIOUS_TXID or
PSBT_IN_OUTPUT_INDEX the result is invalid, and without
PSBT_IN_SEQUENCE and the locktime fields the Transaction Extractor
builds a different transaction.

BIP 370 amends Creator, Updater, Signer and Transaction Extractor for
PSBTv2, adds the Constructor, and says nothing about the Input
Finalizer. Add the section: the five fields are kept. Bitcoin Core
does this today: at 19b0ff2fa0, PSBTInput::Serialize in src/psbt.h
writes them for every PSBTv2 input, finalized or not.
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Ferdinando Ametrano committed 2026-09-23 22:59:14 +02:00
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@@ -278,6 +278,11 @@ If the Signer added a signature that does not use SIGHASH_ANYONECANPAY, the Inpu
If the Signer added a signature that does not use SIGHASH_NONE, the Outputs Modifiable flag must be set to False. If the Signer added a signature that does not use SIGHASH_NONE, the Outputs Modifiable flag must be set to False.
If the Signer added a signature that uses SIGHASH_SINGLE, the Has SIGHASH_SINGLE flag must be set to True. If the Signer added a signature that uses SIGHASH_SINGLE, the Has SIGHASH_SINGLE flag must be set to True.
===Input Finalizer===
For PSBTv2s, when the Input Finalizer clears a finalized input's fields as BIP 174 asks, it must keep PSBT_IN_PREVIOUS_TXID, PSBT_IN_OUTPUT_INDEX, PSBT_IN_SEQUENCE, PSBT_IN_REQUIRED_TIME_LOCKTIME and PSBT_IN_REQUIRED_HEIGHT_LOCKTIME.
The Transaction Extractor constructs the transaction from these fields, and an input missing either PSBT_IN_PREVIOUS_TXID or PSBT_IN_OUTPUT_INDEX is invalid.
===Transaction Extractor=== ===Transaction Extractor===
For PSBTv2s, the transaction is constructed using the PSBTv2 fields. For PSBTv2s, the transaction is constructed using the PSBTv2 fields.