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Merge pull request #3830 from mempool/fix/p2tr-annex-parse

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Fix: Annex parsing for p2tr on bitcoind/romanz backends
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softsimon 2023-06-06 20:27:03 +04:00 committed by GitHub
commit 804640216f
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1 changed files with 29 additions and 3 deletions
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30
backend/src/api/bitcoin/bitcoin-api.ts
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@ -415,11 +415,37 @@ class BitcoinApi implements AbstractBitcoinApi {
vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
}
if (vin.prevout.scriptpubkey_type === 'v1_p2tr' && vin.witness && vin.witness.length > 1) {
const witnessScript = vin.witness[vin.witness.length - 2];
if (vin.prevout.scriptpubkey_type === 'v1_p2tr' && vin.witness) {
const witnessScript = this.witnessToP2TRScript(vin.witness);
if (witnessScript !== null) {
vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
}
}
}
/**
* This function must only be called when we know the witness we are parsing
* is a taproot witness.
* @param witness An array of hex strings that represents the witness stack of
* the input.
* @returns null if the witness is not a script spend, and the hex string of
* the script item if it is a script spend.
*/
private witnessToP2TRScript(witness: string[]): string | null {
if (witness.length < 2) return null;
// Note: see BIP341 for parsing details of witness stack
// If there are at least two witness elements, and the first byte of the
// last element is 0x50, this last element is called annex a and
// is removed from the witness stack.
const hasAnnex = witness[witness.length - 1].substring(0, 2) === '50';
// If there are at least two witness elements left, script path spending is used.
// Call the second-to-last stack element s, the script.
// (Note: this phrasing from BIP341 assumes we've *removed* the annex from the stack)
if (hasAnnex && witness.length < 3) return null;
const positionOfScript = hasAnnex ? witness.length - 3 : witness.length - 2;
return witness[positionOfScript];
}
}