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BIP174: Mention sighash type requirement in Input Finalizer section

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This mirrors the existing PSBT_IN_SIGHASH_TYPE constraint from the
per-input field description. Added to the Input Finalizer section so it
is not missed.
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志宇
2026-05-29 08:03:28 +00:00
parent 7f9434c9c8
commit 9633048fc2
1 changed files with 1 additions and 1 deletions
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@@ -511,7 +511,7 @@ Or, for participants performing fA(psbt) and fB(psbt): Combine(fA(psbt), fB(psbt
===Input Finalizer=== ===Input Finalizer===
The Input Finalizer must only accept a PSBT. The Input Finalizer must only accept a PSBT.
For each input, the Input Finalizer determines if the input has enough data to pass validation. If it does, it must construct the <tt>0x07</tt> Finalized scriptSig and <tt>0x08</tt> Finalized scriptWitness and place them into the input key-value map. For each input, the Input Finalizer determines if the input has enough data to pass validation. If it does, it must construct the <tt>0x07</tt> Finalized scriptSig and <tt>0x08</tt> Finalized scriptWitness and place them into the input key-value map. If the input has a <tt>PSBT_IN_SIGHASH_TYPE</tt> field, the Input Finalizer must fail to finalize that input if any signature does not match the specified sighash type.
If scriptSig is empty for an input, <tt>0x07</tt> should remain unset rather than assigned an empty array. If scriptSig is empty for an input, <tt>0x07</tt> should remain unset rather than assigned an empty array.
Likewise, if no scriptWitness exists for an input, <tt>0x08</tt> should remain unset rather than assigned an empty array. Likewise, if no scriptWitness exists for an input, <tt>0x08</tt> should remain unset rather than assigned an empty array.
All other data except the UTXO and unknown fields in the input key-value map should be cleared from the PSBT. The UTXO should be kept to allow Transaction Extractors to verify the final network serialized transaction. All other data except the UTXO and unknown fields in the input key-value map should be cleared from the PSBT. The UTXO should be kept to allow Transaction Extractors to verify the final network serialized transaction.