highperfocused/mempool
1
0
Fork 0
mirror of https://github.com/mempool/mempool.git synced 2025-09-25 18:11:46 +02:00
Code Issues Packages Projects Releases Wiki Activity

PSBT support for script and signature pre-filling in P2TR inputs

Browse Source
This commit is contained in:
natsoni
2025-07-01 17:12:52 +02:00
parent 2fa7405d46
commit efaeacc249
1 changed files with 67 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
frontend/src/app/shared/transaction.utils.ts
View File

@@ -1052,7 +1052,10 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
finalScriptWitness: null,
redeemScript: null,
witnessScript: null,
partialSigs: []
partialSigs: [],
tapLeafScripts: [],
tapScriptSigs: [],
tapInternalKey: null,
};
for (const record of inputRecords) {
@@ -1078,6 +1081,14 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
case 0x02:
groups.partialSigs.push(record);
break;
case 0x14:
groups.tapScriptSigs.push(record);
break;
case 0x15:
groups.tapLeafScripts.push(record);
break;
case 0x17:
groups.tapInternalKey = record;
}
}
@@ -1175,6 +1186,61 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
vin.witness.unshift(uint8ArrayToHexString(signature));
}
}
if (groups.tapLeafScripts.length && groups.tapInternalKey && !finalizedWitness) {
// If no signature is present, assume key spend *except* if internal key is provably unspendable
if (!groups.tapScriptSigs.length) {
if (uint8ArrayToHexString(groups.tapInternalKey.value) === '50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0') {
// unspendable internal key, use the first tap leaf script provided
const record = groups.tapLeafScripts[0];
const controlBlock = uint8ArrayToHexString(record.key.slice(1));
const tapLeaf = uint8ArrayToHexString(record.value.slice(0, -1));
vin.witness = vin.witness || [];
vin.witness.unshift(tapLeaf, controlBlock);
vin.inner_witnessscript_asm = convertScriptSigAsm(tapLeaf);
}
} else {
// get the hash with the most signatures
const leafScriptSignatures: { [leafHash: string]: number } = {};
let maxSignatures = 0;
let scriptMostSigs = '';
for (const record of groups.tapScriptSigs) {
const leafHash = uint8ArrayToHexString(record.key.slice(33));
if (!leafScriptSignatures[leafHash]) {
leafScriptSignatures[leafHash] = 0;
}
leafScriptSignatures[leafHash]++;
if (leafScriptSignatures[leafHash] > maxSignatures) {
maxSignatures = leafScriptSignatures[leafHash];
scriptMostSigs = leafHash;
}
}
// find the script with most signatures
for (const record of groups.tapLeafScripts) {
const leafVersion = uint8ArrayToHexString(record.value.slice(-1));
const script = uint8ArrayToHexString(record.value.slice(0, -1));
const scriptSize = uint8ArrayToHexString(compactSize(record.value.length - 1));
if (taggedHash('TapLeaf', leafVersion + scriptSize + script) === scriptMostSigs) {
// add the script
const controlBlock = uint8ArrayToHexString(record.key.slice(1));
const tapLeaf = uint8ArrayToHexString(record.value.slice(0, -1));
vin.witness = vin.witness || [];
vin.witness.unshift(tapLeaf, controlBlock);
vin.inner_witnessscript_asm = convertScriptSigAsm(tapLeaf);
// add the signatures that are part of this script
for (const sigRecord of groups.tapScriptSigs) {
const sigLeafHash = uint8ArrayToHexString(sigRecord.key.slice(33));
if (sigLeafHash === scriptMostSigs) {
vin.witness.unshift(uint8ArrayToHexString(sigRecord.value));
}
}
break;
}
}
}
}
}
}