build method

Tx build(SignerCallback signer)

Builds and signs the transaction synchronously.

The signer is invoked once per input with the BIP-143 (segwit) or legacy sighash digest and must return DER-encoded ECDSA signature bytes WITHOUT the trailing sighash flag (the flag is appended when the input is serialized, via InputSig.toBytes).

Implementation

Tx build(SignerCallback signer) {
  final ordered = orderedInputs();
  final outs = orderedOutputs();
  final tx = unsignedTx(ordered, outs);

  final signed = List<TxInput>.generate(ordered.length, (i) {
    final meta = ordered[i];
    final digest = computeDigest(tx, i, meta);
    final sig = signer(tx, i, digest, meta.hashType);
    return buildSignedInput(meta, sig);
  });

  return Tx(
    version: version,
    inputs: signed,
    outputs: outs,
    locktime: locktime,
  );
}