append_signature

Adds a DER-encoded ECDSA signature to a transparent input in the PCZT.

Signature

TypeScript
Go
Kotlin

function append_signature(
  pczt: WasmPczt,
  input_index: number,
  pubkey: string,
  signature: string
): WasmPczt

func AppendSignature(
  pczt *Pczt,
  inputIndex uint32,
  pubkey []byte,
  signature []byte,
) (*Pczt, error)

fun appendSignature(
  pczt: Pczt,
  inputIndex: UInt,
  pubkey: ByteArray,
  signature: ByteArray
): Pczt

Parameters

pczt

Pczt

required

The PCZT to add the signature to

input_index

number

required

Index of the transparent input (0-based)

pubkey

string

required

33-byte compressed public key (hex)

signature

string

required

DER-encoded ECDSA signature with sighash type byte appended (hex)

Returns

Updated PCZT with the signature added.

Signature Format

The signature must be DER-encoded with SIGHASH_ALL (0x01) appended:

[DER signature (70-72 bytes)] + [0x01]

Example

import { secp256k1 } from '@noble/curves/secp256k1';

// Get sighash
const sighash = t2z.get_sighash(pczt, 0);

// Sign
const sig = secp256k1.sign(hexToBytes(sighash), privateKey);
const derSig = sig.toDERRawBytes();

// Append sighash type
const sigWithType = new Uint8Array([...derSig, 0x01]);

// Add to PCZT
pczt = t2z.append_signature(pczt, 0, pubkeyHex, bytesToHex(sigWithType));

Overview

Transaction Construction

Signing

Proving & Finalization

Utilities

append_signature

Signature

Parameters

Returns

Signature Format

Example

See Also

​Signature

​Parameters

​Returns

​Signature Format

​Example

​See Also

Signature

Parameters

Returns

Signature Format

Example

See Also