Function createP2TRCommitDataPsbt

src/btc/btc-p2tr-commit-data.ts:32–121

(
  privateKey: ECPairInterface,
  msgpackEncodedData: Buffer,
  noteUtxo: IUtxo,
  payUtxos: IUtxo[],
  to: ISendToAddress,
  change: string, // Change address
  network: bitcoin.Network,
  feeRate: number,
  fee = 1000 // Assume the fee is 1000
)

// According to the protocol, the first input of the transaction is the NOTE information protocol, and the unlock script is the NOTE script hash
// The transaction output is the account notification
export function createP2TRCommitDataPsbt(
  privateKey: ECPairInterface,
  msgpackEncodedData: Buffer,
  noteUtxo: IUtxo,
  payUtxos: IUtxo[],
  to: ISendToAddress,
  change: string, // Change address
  network: bitcoin.Network,
  feeRate: number,
  fee = 1000 // Assume the fee is 1000
) {
  assert(noteUtxo.type === "P2TR-COMMIT-DATA");

  const pubkey = privateKey.publicKey;

  const p2note = generateP2TRCommitDataInfo(
    msgpackEncodedData,
    pubkey,
    network
  );

  const tapLeafScript = {
    leafVersion: p2note.noteRedeem.redeemVersion,
    script: p2note.noteRedeem.output,
    controlBlock:
      p2note.noteP2TR.witness![p2note.noteP2TR.witness!.length - 1]!,
  };

  const psbt = new bitcoin.Psbt({network});
  psbt.setVersion(2);
  psbt.setLocktime(0);
  let totalInput = 0;
  // Construct NOTE disclosure information
  const input = {
    hash: noteUtxo.txId,
    index: noteUtxo.outputIndex,
    sequence: MAX_SEQUENCE,
    witnessUtxo: {
      script: p2note.noteP2TR.output!,
      value: noteUtxo.satoshis,
    },
    tapLeafScript: [tapLeafScript], // MAST script with NOTE redemption script
  };
  psbt.addInput(input);
  totalInput += noteUtxo.satoshis;

  // Add recharge input
  totalInput += addPsbtPayUtxos(privateKey, psbt, payUtxos, network);

  // Output
  let totalOutput = 0;
  psbt.addOutput({
    address: to.address,
    value: Number(to.amount),
  });
  totalOutput += Number(to.amount);

  // Add change