Ferdinando Ametrano 1e431879af bip-0370: say what the Input Finalizer keeps in a version 2 input ...

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.

2026-09-23 22:59:14 +02:00

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