ecash-lib

Bitcoin ABC official library for building and signing eCash transactions.

npm: ecash-lib

Core Imports

import {
  Ecc,              // Elliptic curve cryptography
  Script,           // Script creation
  TxBuilder,        // Transaction building
  P2PKHSignatory,   // P2PKH signing
  fromHex,          // Hex to Uint8Array
  toHex,            // Uint8Array to hex
  ALL_BIP143,       // BIP143 signing (recommended)
} from 'ecash-lib';

Building Transactions

const txBuild = new TxBuilder({
  inputs: [{
    input: {
      prevOut: { txid: '...', outIdx: 0 },
      signData: { sats: 1000n, outputScript: p2pkhScript },
    },
    signatory: P2PKHSignatory(seckey, pubkey, ALL_BIP143),
  }],
  outputs: [
    { sats: 500n, script: p2pkhScript },
    { sats: 0n, script: p2pkhScript }, // Change
  ],
});

const tx = txBuild.sign({ feePerKb: 1000n, dustSats: 546n });
const rawTx = tx.ser();

Script Creation

// P2PKH
const p2pkhScript = Script.p2pkh(hash160(pubkey));

// P2SH
const p2shScript = Script.p2sh(scriptHash);

// From address
const script = Script.fromAddress('ecash:q...');

Key Methods

Ecc	Description
derivePubkey(seckey)	Derive public key
ecdsaSign(seckey, msg)	ECDSA sign
schnorrSign(seckey, msg)	Schnorr sign

TxBuilder	Description
sign(params)	Sign and return Tx
.inputs	Input array
.outputs	Output array

Tx	Description
ser()	Serialize to Uint8Array
txid()	Get transaction ID
toHex()	Serialize to hex

Important Notes

• Use BigInt for amounts (1000n satoshis)
• Use ALL_BIP143 signing (eCash recommended)
• Use toHex() to convert bytecode to string