Update CHANGELOG and remove old taproot example

Author: junderw

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 6.1.0
+__added__
+- taproot support for payments (p2tr) and PSBT. See taproot.spec.ts integration test for examples. (#1742)
+
 # 6.0.2
 __fixed__
 - p2sh payment now uses empty Buffer for redeem.output when redeemScript is OP_FALSE (#1802)

test/integration/taproot.md

@@ -17,41 +17,6 @@ const bip32 = BIP32Factory(ecc);
 const ECPair = ECPairFactory(ecc);
 
 describe('bitcoinjs-lib (transaction with taproot)', () => {
-  it('can create (and broadcast via 3PBP) a taproot keyspend Transaction', async () => {
-    const myKey = bip32.fromSeed(rng(64), regtest);
-
-    const output = createKeySpendOutput(myKey.publicKey);
-    const address = bitcoin.address.fromOutputScript(output, regtest);
-    // amount from faucet
-    const amount = 42e4;
-    // amount to send
-    const sendAmount = amount - 1e4;
-    // get faucet
-    const unspent = await regtestUtils.faucetComplex(output, amount);
-
-    const tx = createSigned(
-      myKey,
-      unspent.txId,
-      unspent.vout,
-      sendAmount,
-      [output],
-      [amount],
-    );
-
-    const hex = tx.toHex();
-    // console.log('Valid tx sent from:');
-    // console.log(address);
-    // console.log('tx hex:');
-    // console.log(hex);
-    await regtestUtils.broadcast(hex);
-    await regtestUtils.verify({
-      txId: tx.getId(),
-      address,
-      vout: 0,
-      value: sendAmount,
-    });
-  });
-
   it('can create (and broadcast via 3PBP) a taproot key-path spend Transaction', async () => {
     const internalKey = bip32.fromSeed(rng(64), regtest);
     const p2pkhKey = bip32.fromSeed(rng(64), regtest);
@@ -593,83 +558,6 @@ function buildLeafIndexFinalizer(
   };
 }
 
-// Order of the curve (N) - 1
-const N_LESS_1 = Buffer.from(
-  'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140',
-  'hex',
-);
-// 1 represented as 32 bytes BE
-const ONE = Buffer.from(
-  '0000000000000000000000000000000000000000000000000000000000000001',
-  'hex',
-);
-
-// Function for creating a tweaked p2tr key-spend only address
-// (This is recommended by BIP341)
-function createKeySpendOutput(publicKey: Buffer): Buffer {
-  // x-only pubkey (remove 1 byte y parity)
-  const myXOnlyPubkey = toXOnly(publicKey);
-  const commitHash = bitcoin.crypto.taggedHash('TapTweak', myXOnlyPubkey);
-  const tweakResult = ecc.xOnlyPointAddTweak(myXOnlyPubkey, commitHash);
-  if (tweakResult === null) throw new Error('Invalid Tweak');
-  const { xOnlyPubkey: tweaked } = tweakResult;
-  // scriptPubkey
-  return Buffer.concat([
-    // witness v1, PUSH_DATA 32 bytes
-    Buffer.from([0x51, 0x20]),
-    // x-only tweaked pubkey
-    tweaked,
-  ]);
-}
-
-// Function for signing for a tweaked p2tr key-spend only address
-// (Required for the above address)
-interface KeyPair {
-  publicKey: Buffer;
-  privateKey?: Buffer;
-}
-function signTweaked(messageHash: Buffer, key: KeyPair): Uint8Array {
-  const privateKey =
-    key.publicKey[0] === 2
-      ? key.privateKey
-      : ecc.privateAdd(ecc.privateSub(N_LESS_1, key.privateKey!)!, ONE)!;
-  const tweakHash = bitcoin.crypto.taggedHash(
-    'TapTweak',
-    toXOnly(key.publicKey),
-  );
-  const newPrivateKey = ecc.privateAdd(privateKey!, tweakHash);
-  if (newPrivateKey === null) throw new Error('Invalid Tweak');
-  return ecc.signSchnorr(messageHash, newPrivateKey, Buffer.alloc(32));
-}
-
-// Function for creating signed tx
-function createSigned(
-  key: KeyPair,
-  txid: string,
-  vout: number,
-  amountToSend: number,
-  scriptPubkeys: Buffer[],
-  values: number[],
-): bitcoin.Transaction {
-  const tx = new bitcoin.Transaction();
-  tx.version = 2;
-  // Add input
-  tx.addInput(Buffer.from(txid, 'hex').reverse(), vout);
-  // Add output
-  tx.addOutput(scriptPubkeys[0], amountToSend);
-  const sighash = tx.hashForWitnessV1(
-    0, // which input
-    scriptPubkeys, // All previous outputs of all inputs
-    values, // All previous values of all inputs
-    bitcoin.Transaction.SIGHASH_DEFAULT, // sighash flag, DEFAULT is schnorr-only (DEFAULT == ALL)
-  );
-  const signature = Buffer.from(signTweaked(sighash, key));
-  // witness stack for keypath spend is just the signature.
-  // If sighash is not SIGHASH_DEFAULT (ALL) then you must add 1 byte with sighash value
-  tx.ins[0].witness = [signature];
-  return tx;
-}
-
 // This logic will be extracted to ecpair
 function tweakSigner(signer: bitcoin.Signer, opts: any = {}): bitcoin.Signer {
   // eslint-disable-next-line @typescript-eslint/ban-ts-comment