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BIP174: Mention sighash type requirement in Input Finalizer section #2182

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murchandamus merged 1 commit into from
May 29, 2026
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BIP174: Mention sighash type requirement in Input Finalizer section #2182

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2 changes: 1 addition & 1 deletion bip-0174.mediawiki
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Expand Up @@ -511,7 +511,7 @@ Or, for participants performing fA(psbt) and fB(psbt): Combine(fA(psbt), fB(psbt
===Input Finalizer===

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.
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.
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