text: const {Blockchain, Transaction}= require('./blockchain');
  const EC = require('elliptic').ec;
  const ec = new EC('secp256k1');
  
  const myKey = ec.keyFromPrivate('9a697f8b0aa0172d71e24c3e8a13ce52e709eaa9a6ddcd7ffff4323b7a5be7a3');
  
  // From that we can calculate your public key (which doubles as your wallet address)
  const myWalletAddress = myKey.getPublic('hex');
  
  // Create new instance of Blockchain class
  const Alphas = new Blockchain();
  
  // Create a transaction & sign it with your key
  const tx1 = new Transaction(myWalletAddress, 'address2', 100);
  tx1.signTransaction(myKey);
  Alphas.addTransaction(tx1);
  
  // Mine block
  Alphas.minePendingTransactions(myWalletAddress);
  
  // Create second transaction
  const tx2 = new Transaction(myWalletAddress, 'address1', 50);
  tx2.signTransaction(myKey);
  Alphas.addTransaction(tx2);
  
  // Mine block
  Alphas.minePendingTransactions(myWalletAddress);
  
  console.log('\nBalance of younes is', Alphas.getBalanceOfAddress(myWalletAddress));
  
  console.log();
  console.log('Blockchain valid?', Alphas.isChainValid() ? 'Yes' : 'No');