generate-testnet-key.js

// Generate a testnet private key and address for testing
const crypto = require('crypto');
const secp256k1 = require('secp256k1');
const bs58check = require('bs58check');
const { createHash } = require('crypto');

function ripemd160(buffer) {
  return createHash('ripemd160').update(buffer).digest();
}

function sha256(buffer) {
  return createHash('sha256').update(buffer).digest();
}

function generateTestnetAddress() {
  // Generate random private key
  let privateKey;
  do {
    privateKey = crypto.randomBytes(32);
  } while (!secp256k1.privateKeyVerify(privateKey));

  // Get public key (compressed)
  const publicKey = Buffer.from(secp256k1.publicKeyCreate(privateKey, true));

  // Hash public key: SHA256 then RIPEMD160
  const sha = sha256(publicKey);
  const hash160 = ripemd160(sha);

  // Add testnet P2PKH prefix (0x1D 0x25 for testnet 'tm' addresses)
  const payload = Buffer.concat([Buffer.from([0x1D, 0x25]), hash160]);

  // Encode with base58check
  const address = bs58check.default.encode(payload);

  return {
    privateKey: privateKey.toString('hex'),
    publicKey: publicKey.toString('hex'),
    address: address
  };
}

console.log('🔑 Zcash Testnet Address Generator\n');

const wallet = generateTestnetAddress();

console.log('✅ Generated Testnet Wallet:');
console.log('─'.repeat(60));
console.log('Private Key:', wallet.privateKey);
console.log('Public Key: ', wallet.publicKey);
console.log('Address:    ', wallet.address);
console.log('─'.repeat(60));

console.log('\n⚠️  IMPORTANT:');
console.log('1. Save the private key securely (for signing)');
console.log('2. Use the address to receive testnet ZEC from faucet');
console.log('3. Never use this for mainnet!');
console.log('\n📍 Testnet Faucet: https://faucet.zecpages.com/');
console.log('   Paste your address:', wallet.address);