Method constructor

src/blockchain.js:13–18

* @param {string} fromAddress * @param {string} toAddress * @param {number} amount

(fromAddress, toAddress, amount)

   * @param {number} amount
   */
  constructor(fromAddress, toAddress, amount) {
    this.fromAddress = fromAddress;
    this.toAddress = toAddress;
    this.amount = amount;
    this.timestamp = Date.now();
  }

  /**
   * Creates a SHA256 hash of the transaction