ledger-btc-signing.ts

import AppBtc from "@ledgerhq/hw-app-btc";
import Transport from '@ledgerhq/hw-transport-u2f';
import * as bitcoin from 'bitcoinjs-lib';
import {toBufferLE} from 'bigint-buffer';

const OPEN_TIMEOUT = 10000;
const LISTENER_TIMEOUT = 300;
const NETWORK = bitcoin.networks.testnet;

async function main() {
    const transport = await Transport.create(OPEN_TIMEOUT, LISTENER_TIMEOUT);
    const app = new AppBtc(transport);
    const txIndex = 1;
    const utxoHex = "*****";
    const utxo = app.splitTransaction(utxoHex, true);
    const script = bitcoin.payments.p2sh({ address: "*****", network: NETWORK });
    const outputScriptHex = app.serializeTransactionOutputs({
        version: Buffer.from("01000000", 'hex'),
        inputs: [],
        outputs: [{
            amount: toBufferLE(BigInt(100), 8),
            script: script.output || Buffer.from(""),
        }]
    }).toString('hex');

    const publicKeyHex = "*****";
    const { publicKey } = bitcoin.ECPair.fromPublicKey(Buffer.from(publicKeyHex, 'hex'));
    const p2wpkh = bitcoin.payments.p2wpkh({ pubkey: publicKey, network: NETWORK });
    const p2wsh_p2wpkh = bitcoin.payments.p2wsh({ redeem: p2wpkh, network: NETWORK });
    const redeemScript = p2wsh_p2wpkh.redeem?.output;

    const signature = await app.signP2SHTransaction({
        inputs: [[utxo, txIndex, redeemScript?.toString('hex') || "", null]],
        associatedKeysets: [ "49'/1'/0'/0" ],
        outputScriptHex,
        lockTime: 0,
        segwit: false,
        transactionVersion: 1,
        sigHashType: 1,
    });
    console.log(signature);
}

main();