// Import modules that are useful to you
const { BIP322, Signer, Verifier } = require('bip322-js');

// Signing a BIP-322 signature with a private key
const privateKey = 'L3VFeEujGtevx9w18HD1fhRbCH67Az2dpCymeRE1SoPK6XQtaN2k';
const address = 'bc1q9vza2e8x573nczrlzms0wvx3gsqjx7vavgkx0l';
const message = 'Hello World';
const signature = Signer.sign(privateKey, address, message);
console.log(signature);

// Verifying a simple BIP-322 signature
const validity = Verifier.verifySignature(address, message, signature);
console.log(validity); // True

// You can also get the raw unsigned BIP-322 toSpend and toSign transaction directly
const scriptPubKey = Buffer.from('00142b05d564e6a7a33c087f16e0f730d1440123799d', 'hex');
const toSpend = BIP322.buildToSpendTx(message, scriptPubKey); // bitcoin.Transaction
const toSpendTxId = toSpend.getId();
const toSign = BIP322.buildToSignTx(toSpendTxId, scriptPubKey); // bitcoin.Psbt
// Do whatever you want to do with the PSBT