@bitgo/utxo-lib
Version:
Client-side Bitcoin JavaScript library
342 lines • 50.1 kB
JavaScript
"use strict";
// SegWit version 1 P2TR output type for Taproot defined in
// https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki
Object.defineProperty(exports, "__esModule", { value: true });
exports.p2tr = p2tr;
const networks_1 = require("../networks");
const bitcoinjs_lib_1 = require("bitcoinjs-lib");
const taproot = require("../taproot");
const secp256k1_1 = require("@bitgo/secp256k1");
const typef = require('typeforce');
const OPS = bitcoinjs_lib_1.script.OPS;
const { bech32m } = require('bech32');
const BITCOIN_NETWORK = networks_1.networks.bitcoin;
/**
* A secp256k1 x coordinate with unknown discrete logarithm used for eliminating
* keypath spends, equal to SHA256(uncompressedDER(SECP256K1_GENERATOR_POINT)).
*/
const H = Buffer.from('50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0', 'hex');
const EMPTY_BUFFER = Buffer.alloc(0);
function isPlainPubkey(pubKey) {
return secp256k1_1.ecc.isPoint(pubKey);
}
function isPlainPubkeys(pubkeys) {
return pubkeys.every(isPlainPubkey);
}
// output: OP_1 {witnessProgram}
function p2tr(a, opts) {
if (!a.address && !a.pubkey && !a.pubkeys && !(a.redeems && a.redeems.length) && !a.output && !a.witness) {
throw new TypeError('Not enough data');
}
opts = Object.assign({ validate: true }, opts || {});
if (!opts.eccLib)
throw new Error('ECC Library is required for p2tr.');
const ecc = opts.eccLib;
typef({
network: typef.maybe(typef.Object),
address: typef.maybe(typef.String),
// the output script should be a fixed 34 bytes.
// 1 byte for OP_1 indicating segwit version 1, one byte for 0x20 to push
// the next 32 bytes, followed by the 32 byte witness program
output: typef.maybe(typef.BufferN(34)),
// a single pubkey
pubkey: typef.maybe(ecc.isXOnlyPoint),
// the pub key(s) used for keypath signing.
// aggregated with MuSig2* if > 1
pubkeys: typef.maybe(typef.anyOf(typef.arrayOf(ecc.isXOnlyPoint), typef.arrayOf(isPlainPubkey))),
redeems: typef.maybe(typef.arrayOf({
network: typef.maybe(typef.Object),
output: typef.maybe(typef.Buffer),
weight: typef.maybe(typef.Number),
depth: typef.maybe(typef.Number),
witness: typef.maybe(typef.arrayOf(typef.Buffer)),
})),
redeemIndex: typef.maybe(typef.Number), // Selects the redeem to spend
signature: typef.maybe(bitcoinjs_lib_1.script.isCanonicalSchnorrSignature),
controlBlock: typef.maybe(typef.Buffer),
annex: typef.maybe(typef.Buffer),
}, a);
const _address = bitcoinjs_lib_1.lazy.value(() => {
if (!a.address)
return undefined;
const result = bech32m.decode(a.address);
const version = result.words.shift();
const data = bech32m.fromWords(result.words);
return {
version,
prefix: result.prefix,
data: Buffer.from(data),
};
});
const _outputPubkey = bitcoinjs_lib_1.lazy.value(() => {
// we remove the first two bytes (OP_1 0x20) from the output script to
// extract the 32 byte taproot pubkey (aka witness program)
return a.output && a.output.slice(2);
});
const network = a.network || BITCOIN_NETWORK;
const o = { network };
const _taprootPaths = bitcoinjs_lib_1.lazy.value(() => {
if (!a.redeems)
return;
if (o.tapTree) {
return taproot.getDepthFirstTaptree(o.tapTree);
}
const outputs = a.redeems.map(({ output }) => output);
if (!outputs.every((output) => output))
return;
return taproot.getHuffmanTaptree(outputs, a.redeems.map(({ weight }) => weight));
});
const _parsedWitness = bitcoinjs_lib_1.lazy.value(() => {
if (!a.witness)
return;
return taproot.parseTaprootWitness(a.witness);
});
const _parsedControlBlock = bitcoinjs_lib_1.lazy.value(() => {
// Can't use o.controlBlock, because it could be circular
if (a.controlBlock)
return taproot.parseControlBlock(ecc, a.controlBlock);
const parsedWitness = _parsedWitness();
if (parsedWitness && parsedWitness.spendType === 'Script') {
return taproot.parseControlBlock(ecc, parsedWitness.controlBlock);
}
});
bitcoinjs_lib_1.lazy.prop(o, 'internalPubkey', () => {
if (a.pubkey) {
// single pubkey
return a.pubkey;
}
else if (a.pubkeys && a.pubkeys.length === 1) {
return a.pubkeys[0];
}
else if (a.pubkeys && a.pubkeys.length > 1) {
if (isPlainPubkeys(a.pubkeys)) {
// p2trMusig2 address type
return Buffer.from(secp256k1_1.musig.getXOnlyPubkey(secp256k1_1.musig.keyAgg(a.pubkeys)));
}
// legacy p2tr address type
return Buffer.from(taproot.aggregateMuSigPubkeys(ecc, a.pubkeys));
}
else if (_parsedControlBlock()) {
return _parsedControlBlock()?.internalPubkey;
}
else {
// If there is no key path spending condition, we use an internal key with unknown secret key.
// TODO: In order to avoid leaking the information that key path spending is not possible it
// is recommended to pick a fresh integer r in the range 0...n-1 uniformly at random and use
// H + rG as internal key. It is possible to prove that this internal key does not have a
// known discrete logarithm with respect to G by revealing r to a verifier who can then
// reconstruct how the internal key was created.
return H;
}
});
bitcoinjs_lib_1.lazy.prop(o, 'taptreeRoot', () => {
const parsedControlBlock = _parsedControlBlock();
const parsedWitness = _parsedWitness();
let taptreeRoot;
// Prefer to get the root via the control block because not all redeems may
// be available
if (parsedControlBlock) {
let tapscript;
if (parsedWitness && parsedWitness.spendType === 'Script') {
tapscript = parsedWitness.tapscript;
}
else if (o.redeem && o.redeem.output) {
tapscript = o.redeem.output;
}
if (tapscript)
taptreeRoot = taproot.getTaptreeRoot(ecc, parsedControlBlock, tapscript);
}
if (!taptreeRoot && _taprootPaths())
taptreeRoot = _taprootPaths()?.root;
return taptreeRoot;
});
const _taprootPubkey = bitcoinjs_lib_1.lazy.value(() => {
const taptreeRoot = o.taptreeRoot;
// Refuse to create an unspendable key
if (!a.pubkey && !(a.pubkeys && a.pubkeys.length) && !a.redeems && !taptreeRoot) {
return;
}
return taproot.tapTweakPubkey(ecc, o?.internalPubkey, taptreeRoot);
});
bitcoinjs_lib_1.lazy.prop(o, 'tapTree', () => {
if (!a.redeems)
return;
if (a.redeems.find(({ depth }) => depth === undefined)) {
console.warn('Deprecation Warning: Weight-based tap tree construction will be removed in the future. ' +
'Please use depth-first coding as specified in BIP-0371.');
return;
}
if (!a.redeems.every(({ output }) => output))
return;
return {
leaves: a.redeems.map(({ output, depth }) => {
return {
script: output,
leafVersion: taproot.INITIAL_TAPSCRIPT_VERSION,
depth,
};
}),
};
});
bitcoinjs_lib_1.lazy.prop(o, 'address', () => {
const pubkey = _outputPubkey() || (_taprootPubkey() && _taprootPubkey()?.xOnlyPubkey);
// only encode the 32 byte witness program as bech32m
const words = bech32m.toWords(pubkey);
words.unshift(0x01);
return bech32m.encode(network.bech32, words);
});
bitcoinjs_lib_1.lazy.prop(o, 'controlBlock', () => {
const parsedWitness = _parsedWitness();
if (parsedWitness && parsedWitness.spendType === 'Script') {
return parsedWitness.controlBlock;
}
const taprootPubkey = _taprootPubkey();
const taprootPaths = _taprootPaths();
if (!taprootPaths || !taprootPubkey || a.redeemIndex === undefined)
return;
return taproot.getControlBlock(taprootPubkey.parity, o.internalPubkey, taprootPaths.paths[a.redeemIndex]);
});
bitcoinjs_lib_1.lazy.prop(o, 'signature', () => {
const parsedWitness = _parsedWitness();
if (parsedWitness && parsedWitness.spendType === 'Key') {
return parsedWitness.signature;
}
});
bitcoinjs_lib_1.lazy.prop(o, 'annex', () => {
if (!_parsedWitness())
return;
return _parsedWitness().annex;
});
bitcoinjs_lib_1.lazy.prop(o, 'output', () => {
if (a.address) {
const { data } = _address();
return bitcoinjs_lib_1.script.compile([OPS.OP_1, data]);
}
const taprootPubkey = _taprootPubkey();
if (!taprootPubkey)
return;
// OP_1 indicates segwit version 1
return bitcoinjs_lib_1.script.compile([OPS.OP_1, Buffer.from(taprootPubkey.xOnlyPubkey)]);
});
bitcoinjs_lib_1.lazy.prop(o, 'witness', () => {
if (!a.redeems) {
if (a.signature)
return [a.signature]; // Keypath spend
return;
}
else if (!o.redeem) {
return; // No chosen redeem script, can't make witness
}
else if (!o.controlBlock) {
return;
}
let redeemWitness;
// some callers may provide witness elements in the input script
if (o.redeem.input && o.redeem.input.length > 0 && o.redeem.output && o.redeem.output.length > 0) {
// transform redeem input to witness stack
redeemWitness = bitcoinjs_lib_1.script.toStack(bitcoinjs_lib_1.script.decompile(o.redeem.input));
// assigns a new object to o.redeem
o.redeems[a.redeemIndex] = Object.assign({ witness: redeemWitness }, o.redeem);
o.redeem.input = EMPTY_BUFFER;
}
else if (o.redeem.output && o.redeem.output.length > 0 && o.redeem.witness && o.redeem.witness.length > 0) {
redeemWitness = o.redeem.witness;
}
else {
return;
}
const witness = [...redeemWitness, o.redeem.output, o.controlBlock];
if (a.annex) {
witness.push(a.annex);
}
return witness;
});
bitcoinjs_lib_1.lazy.prop(o, 'name', () => {
const nameParts = ['p2tr'];
return nameParts.join('-');
});
bitcoinjs_lib_1.lazy.prop(o, 'redeem', () => {
if (a.redeems) {
if (a.redeemIndex === undefined)
return;
return a.redeems[a.redeemIndex];
}
const parsedWitness = _parsedWitness();
if (parsedWitness && parsedWitness.spendType === 'Script') {
return {
witness: parsedWitness.scriptSig,
output: parsedWitness.tapscript,
};
}
});
// extended validation
if (opts.validate) {
const taprootPubkey = _taprootPubkey();
if (a.output) {
if (a.output[0] !== OPS.OP_1 || a.output[1] !== 0x20) {
throw new TypeError('Output is invalid');
}
// if we're passed both an output script and an address, ensure they match
if (a.address && _outputPubkey && !_outputPubkey()?.equals(_address()?.data)) {
throw new TypeError('mismatch between address & output');
}
// Wrapping `taprootPubkey.xOnlyPubkey` in Buffer because of a peculiar issue in the frontend
// where a polyfill for Buffer is used. Refer: https://bitgoinc.atlassian.net/browse/BG-61420
if (taprootPubkey && _outputPubkey && !_outputPubkey()?.equals(Buffer.from(taprootPubkey.xOnlyPubkey))) {
throw new TypeError('mismatch between output and taproot pubkey');
}
}
if (a.address) {
if (taprootPubkey && !_address()?.data.equals(Buffer.from(taprootPubkey.xOnlyPubkey))) {
throw new TypeError('mismatch between address and taproot pubkey');
}
}
const parsedControlBlock = _parsedControlBlock();
if (parsedControlBlock) {
if (!parsedControlBlock.internalPubkey.equals(o?.internalPubkey)) {
throw new TypeError('Internal pubkey mismatch');
}
if (taprootPubkey && parsedControlBlock.parity !== taprootPubkey.parity) {
throw new TypeError('Parity mismatch');
}
}
if (a.redeems) {
if (!a.redeems.length)
throw new TypeError('Empty redeems');
if (a.redeemIndex !== undefined && (a.redeemIndex < 0 || a.redeemIndex >= a.redeems.length)) {
throw new TypeError('invalid redeem index');
}
a.redeems.forEach((redeem) => {
if (redeem.network && redeem.network !== network) {
throw new TypeError('Network mismatch');
}
});
}
const chosenRedeem = a.redeems && a.redeemIndex !== undefined && a.redeems[a.redeemIndex];
const parsedWitness = _parsedWitness();
if (parsedWitness && parsedWitness.spendType === 'Key') {
if (a.controlBlock) {
throw new TypeError('unexpected control block for key path');
}
if (a.signature && !a.signature.equals(parsedWitness.signature)) {
throw new TypeError('mismatch between witness & signature');
}
}
if (parsedWitness && parsedWitness.spendType === 'Script') {
if (a.signature) {
throw new TypeError('unexpected signature with script path witness');
}
if (a.controlBlock && !a.controlBlock.equals(parsedWitness.controlBlock)) {
throw new TypeError('control block mismatch');
}
if (a.annex && parsedWitness.annex && !a.annex.equals(parsedWitness.annex)) {
throw new TypeError('annex mismatch');
}
if (chosenRedeem && chosenRedeem.output && !chosenRedeem.output.equals(parsedWitness.tapscript)) {
throw new TypeError('tapscript mismatch');
}
}
}
return Object.assign(o, a);
}
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SegWit version 1 P2TR output type for Taproot defined in\n// https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki\n\nimport { networks } from '../networks';\nimport { script as bscript, Payment, PaymentOpts, lazy } from 'bitcoinjs-lib';\nimport * as taproot from '../taproot';\nimport { musig, ecc } from '@bitgo/secp256k1';\n\nconst typef = require('typeforce');\nconst OPS = bscript.OPS;\n\nconst { bech32m } = require('bech32');\n\nconst BITCOIN_NETWORK = networks.bitcoin;\n\n/**\n * A secp256k1 x coordinate with unknown discrete logarithm used for eliminating\n * keypath spends, equal to SHA256(uncompressedDER(SECP256K1_GENERATOR_POINT)).\n */\nconst H = Buffer.from('50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0', 'hex');\nconst EMPTY_BUFFER = Buffer.alloc(0);\n\nfunction isPlainPubkey(pubKey: Uint8Array): boolean {\n  return ecc.isPoint(pubKey);\n}\n\nfunction isPlainPubkeys(pubkeys: Buffer[]) {\n  return pubkeys.every(isPlainPubkey);\n}\n\n// output: OP_1 {witnessProgram}\nexport function p2tr(a: Payment, opts?: PaymentOpts): Payment {\n  if (!a.address && !a.pubkey && !a.pubkeys && !(a.redeems && a.redeems.length) && !a.output && !a.witness) {\n    throw new TypeError('Not enough data');\n  }\n  opts = Object.assign({ validate: true }, opts || {});\n\n  if (!opts.eccLib) throw new Error('ECC Library is required for p2tr.');\n  const ecc = opts.eccLib;\n\n  typef(\n    {\n      network: typef.maybe(typef.Object),\n\n      address: typef.maybe(typef.String),\n      // the output script should be a fixed 34 bytes.\n      // 1 byte for OP_1 indicating segwit version 1, one byte for 0x20 to push\n      // the next 32 bytes, followed by the 32 byte witness program\n      output: typef.maybe(typef.BufferN(34)),\n      // a single pubkey\n      pubkey: typef.maybe(ecc.isXOnlyPoint),\n      // the pub key(s) used for keypath signing.\n      // aggregated with MuSig2* if > 1\n      pubkeys: typef.maybe(typef.anyOf(typef.arrayOf(ecc.isXOnlyPoint), typef.arrayOf(isPlainPubkey))),\n\n      redeems: typef.maybe(\n        typef.arrayOf({\n          network: typef.maybe(typef.Object),\n          output: typef.maybe(typef.Buffer),\n          weight: typef.maybe(typef.Number),\n          depth: typef.maybe(typef.Number),\n          witness: typef.maybe(typef.arrayOf(typef.Buffer)),\n        })\n      ),\n      redeemIndex: typef.maybe(typef.Number), // Selects the redeem to spend\n\n      signature: typef.maybe(bscript.isCanonicalSchnorrSignature),\n      controlBlock: typef.maybe(typef.Buffer),\n      annex: typef.maybe(typef.Buffer),\n    },\n    a\n  );\n\n  const _address = lazy.value(() => {\n    if (!a.address) return undefined;\n\n    const result = bech32m.decode(a.address);\n    const version = result.words.shift();\n    const data = bech32m.fromWords(result.words);\n    return {\n      version,\n      prefix: result.prefix,\n      data: Buffer.from(data),\n    };\n  });\n  const _outputPubkey = lazy.value(() => {\n    // we remove the first two bytes (OP_1 0x20) from the output script to\n    // extract the 32 byte taproot pubkey (aka witness program)\n    return a.output && a.output.slice(2);\n  });\n\n  const network = a.network || BITCOIN_NETWORK;\n\n  const o: Payment = { network };\n\n  const _taprootPaths = lazy.value(() => {\n    if (!a.redeems) return;\n    if (o.tapTree) {\n      return taproot.getDepthFirstTaptree(o.tapTree);\n    }\n    const outputs: Array<Buffer | undefined> = a.redeems.map(({ output }) => output);\n    if (!outputs.every((output) => output)) return;\n    return taproot.getHuffmanTaptree(\n      outputs as Buffer[],\n      a.redeems.map(({ weight }) => weight)\n    );\n  });\n  const _parsedWitness = lazy.value(() => {\n    if (!a.witness) return;\n    return taproot.parseTaprootWitness(a.witness);\n  });\n  const _parsedControlBlock = lazy.value(() => {\n    // Can't use o.controlBlock, because it could be circular\n    if (a.controlBlock) return taproot.parseControlBlock(ecc, a.controlBlock);\n    const parsedWitness = _parsedWitness();\n    if (parsedWitness && parsedWitness.spendType === 'Script') {\n      return taproot.parseControlBlock(ecc, parsedWitness.controlBlock);\n    }\n  });\n\n  lazy.prop(o, 'internalPubkey', () => {\n    if (a.pubkey) {\n      // single pubkey\n      return a.pubkey;\n    } else if (a.pubkeys && a.pubkeys.length === 1) {\n      return a.pubkeys[0];\n    } else if (a.pubkeys && a.pubkeys.length > 1) {\n      if (isPlainPubkeys(a.pubkeys)) {\n        // p2trMusig2 address type\n        return Buffer.from(musig.getXOnlyPubkey(musig.keyAgg(a.pubkeys)));\n      }\n\n      // legacy p2tr address type\n      return Buffer.from(taproot.aggregateMuSigPubkeys(ecc, a.pubkeys));\n    } else if (_parsedControlBlock()) {\n      return _parsedControlBlock()?.internalPubkey;\n    } else {\n      // If there is no key path spending condition, we use an internal key with unknown secret key.\n      // TODO: In order to avoid leaking the information that key path spending is not possible it\n      // is recommended to pick a fresh integer r in the range 0...n-1 uniformly at random and use\n      // H + rG as internal key. It is possible to prove that this internal key does not have a\n      // known discrete logarithm with respect to G by revealing r to a verifier who can then\n      // reconstruct how the internal key was created.\n      return H;\n    }\n  });\n\n  lazy.prop(o, 'taptreeRoot', () => {\n    const parsedControlBlock = _parsedControlBlock();\n    const parsedWitness = _parsedWitness();\n    let taptreeRoot;\n    // Prefer to get the root via the control block because not all redeems may\n    // be available\n    if (parsedControlBlock) {\n      let tapscript;\n      if (parsedWitness && parsedWitness.spendType === 'Script') {\n        tapscript = parsedWitness.tapscript;\n      } else if (o.redeem && o.redeem.output) {\n        tapscript = o.redeem.output;\n      }\n      if (tapscript) taptreeRoot = taproot.getTaptreeRoot(ecc, parsedControlBlock, tapscript);\n    }\n    if (!taptreeRoot && _taprootPaths()) taptreeRoot = _taprootPaths()?.root;\n\n    return taptreeRoot;\n  });\n\n  const _taprootPubkey = lazy.value(() => {\n    const taptreeRoot = o.taptreeRoot;\n    // Refuse to create an unspendable key\n    if (!a.pubkey && !(a.pubkeys && a.pubkeys.length) && !a.redeems && !taptreeRoot) {\n      return;\n    }\n    return taproot.tapTweakPubkey(ecc, o?.internalPubkey as Uint8Array, taptreeRoot);\n  });\n\n  lazy.prop(o, 'tapTree', () => {\n    if (!a.redeems) return;\n    if (a.redeems.find(({ depth }) => depth === undefined)) {\n      console.warn(\n        'Deprecation Warning: Weight-based tap tree construction will be removed in the future. ' +\n          'Please use depth-first coding as specified in BIP-0371.'\n      );\n      return;\n    }\n    if (!a.redeems.every(({ output }) => output)) return;\n    return {\n      leaves: a.redeems.map(({ output, depth }) => {\n        return {\n          script: output,\n          leafVersion: taproot.INITIAL_TAPSCRIPT_VERSION,\n          depth,\n        };\n      }),\n    };\n  });\n  lazy.prop(o, 'address', () => {\n    const pubkey = _outputPubkey() || (_taprootPubkey() && _taprootPubkey()?.xOnlyPubkey);\n    // only encode the 32 byte witness program as bech32m\n    const words = bech32m.toWords(pubkey);\n    words.unshift(0x01);\n    return bech32m.encode(network.bech32, words);\n  });\n  lazy.prop(o, 'controlBlock', () => {\n    const parsedWitness = _parsedWitness();\n    if (parsedWitness && parsedWitness.spendType === 'Script') {\n      return parsedWitness.controlBlock;\n    }\n    const taprootPubkey = _taprootPubkey();\n    const taprootPaths = _taprootPaths();\n    if (!taprootPaths || !taprootPubkey || a.redeemIndex === undefined) return;\n    return taproot.getControlBlock(taprootPubkey.parity, o.internalPubkey!, taprootPaths.paths[a.redeemIndex]);\n  });\n  lazy.prop(o, 'signature', () => {\n    const parsedWitness = _parsedWitness();\n    if (parsedWitness && parsedWitness.spendType === 'Key') {\n      return parsedWitness.signature;\n    }\n  });\n  lazy.prop(o, 'annex', () => {\n    if (!_parsedWitness()) return;\n    return _parsedWitness()!.annex;\n  });\n  lazy.prop(o, 'output', () => {\n    if (a.address) {\n      const { data } = _address()!;\n      return bscript.compile([OPS.OP_1, data]);\n    }\n\n    const taprootPubkey = _taprootPubkey();\n    if (!taprootPubkey) return;\n\n    // OP_1 indicates segwit version 1\n    return bscript.compile([OPS.OP_1, Buffer.from(taprootPubkey.xOnlyPubkey)]);\n  });\n  lazy.prop(o, 'witness', () => {\n    if (!a.redeems) {\n      if (a.signature) return [a.signature]; // Keypath spend\n      return;\n    } else if (!o.redeem) {\n      return; // No chosen redeem script, can't make witness\n    } else if (!o.controlBlock) {\n      return;\n    }\n\n    let redeemWitness;\n    // some callers may provide witness elements in the input script\n    if (o.redeem.input && o.redeem.input.length > 0 && o.redeem.output && o.redeem.output.length > 0) {\n      // transform redeem input to witness stack\n      redeemWitness = bscript.toStack(bscript.decompile(o.redeem.input)!);\n\n      // assigns a new object to o.redeem\n      o.redeems![a.redeemIndex!] = Object.assign({ witness: redeemWitness }, o.redeem);\n      o.redeem.input = EMPTY_BUFFER;\n    } else if (o.redeem.output && o.redeem.output.length > 0 && o.redeem.witness && o.redeem.witness.length > 0) {\n      redeemWitness = o.redeem.witness;\n    } else {\n      return;\n    }\n\n    const witness = [...redeemWitness, o.redeem.output, o.controlBlock];\n\n    if (a.annex) {\n      witness.push(a.annex);\n    }\n\n    return witness;\n  });\n  lazy.prop(o, 'name', () => {\n    const nameParts = ['p2tr'];\n    return nameParts.join('-');\n  });\n  lazy.prop(o, 'redeem', () => {\n    if (a.redeems) {\n      if (a.redeemIndex === undefined) return;\n      return a.redeems[a.redeemIndex];\n    }\n    const parsedWitness = _parsedWitness();\n    if (parsedWitness && parsedWitness.spendType === 'Script') {\n      return {\n        witness: parsedWitness.scriptSig,\n        output: parsedWitness.tapscript,\n      };\n    }\n  });\n\n  // extended validation\n  if (opts.validate) {\n    const taprootPubkey = _taprootPubkey();\n\n    if (a.output) {\n      if (a.output[0] !== OPS.OP_1 || a.output[1] !== 0x20) {\n        throw new TypeError('Output is invalid');\n      }\n\n      // if we're passed both an output script and an address, ensure they match\n      if (a.address && _outputPubkey && !_outputPubkey()?.equals(_address()?.data as Buffer)) {\n        throw new TypeError('mismatch between address & output');\n      }\n\n      // Wrapping `taprootPubkey.xOnlyPubkey` in Buffer because of a peculiar issue in the frontend\n      // where a polyfill for Buffer is used. Refer: https://bitgoinc.atlassian.net/browse/BG-61420\n      if (taprootPubkey && _outputPubkey && !_outputPubkey()?.equals(Buffer.from(taprootPubkey.xOnlyPubkey))) {\n        throw new TypeError('mismatch between output and taproot pubkey');\n      }\n    }\n\n    if (a.address) {\n      if (taprootPubkey && !_address()?.data.equals(Buffer.from(taprootPubkey.xOnlyPubkey))) {\n        throw new TypeError('mismatch between address and taproot pubkey');\n      }\n    }\n\n    const parsedControlBlock = _parsedControlBlock();\n    if (parsedControlBlock) {\n      if (!parsedControlBlock.internalPubkey.equals(o?.internalPubkey as Uint8Array)) {\n        throw new TypeError('Internal pubkey mismatch');\n      }\n      if (taprootPubkey && parsedControlBlock.parity !== taprootPubkey.parity) {\n        throw new TypeError('Parity mismatch');\n      }\n    }\n\n    if (a.redeems) {\n      if (!a.redeems.length) throw new TypeError('Empty redeems');\n      if (a.redeemIndex !== undefined && (a.redeemIndex < 0 || a.redeemIndex >= a.redeems.length)) {\n        throw new TypeError('invalid redeem index');\n      }\n      a.redeems.forEach((redeem) => {\n        if (redeem.network && redeem.network !== network) {\n          throw new TypeError('Network mismatch');\n        }\n      });\n    }\n\n    const chosenRedeem = a.redeems && a.redeemIndex !== undefined && a.redeems[a.redeemIndex];\n\n    const parsedWitness = _parsedWitness();\n    if (parsedWitness && parsedWitness.spendType === 'Key') {\n      if (a.controlBlock) {\n        throw new TypeError('unexpected control block for key path');\n      }\n\n      if (a.signature && !a.signature.equals(parsedWitness.signature)) {\n        throw new TypeError('mismatch between witness & signature');\n      }\n    }\n    if (parsedWitness && parsedWitness.spendType === 'Script') {\n      if (a.signature) {\n        throw new TypeError('unexpected signature with script path witness');\n      }\n\n      if (a.controlBlock && !a.controlBlock.equals(parsedWitness.controlBlock)) {\n        throw new TypeError('control block mismatch');\n      }\n\n      if (a.annex && parsedWitness.annex && !a.annex.equals(parsedWitness.annex)) {\n        throw new TypeError('annex mismatch');\n      }\n\n      if (chosenRedeem && chosenRedeem.output && !chosenRedeem.output.equals(parsedWitness.tapscript)) {\n        throw new TypeError('tapscript mismatch');\n    