Class Blockchain

src/blockchain.js:141–330

}

class Blockchain {
  constructor() {
    this.chain = [this.createGenesisBlock()];
    this.difficulty = 2;
    this.pendingTransactions = [];
    this.miningReward = 100;
  }

  /**
   * @returns {Block}
   */
  createGenesisBlock() {
    return new Block(Date.parse('2017-01-01'), [], '0');
  }

  /**
   * Returns the latest block on our chain. Useful when you want to create a
   * new Block and you need the hash of the previous Block.
   *
   * @returns {Block[]}
   */
  getLatestBlock() {
    return this.chain[this.chain.length - 1];
  }

  /**
   * Takes all the pending transactions, puts them in a Block and starts the
   * mining process. It also adds a transaction to send the mining reward to
   * the given address.
   *
   * @param {string} miningRewardAddress
   */
  minePendingTransactions(miningRewardAddress) {
    const rewardTx = new Transaction(
      null,
      miningRewardAddress,
      this.miningReward
    );
    this.pendingTransactions.push(rewardTx);

    const block = new Block(
      Date.now(),
      this.pendingTransactions,
      this.getLatestBlock().hash
    );
    block.mineBlock(this.difficulty);

    debug('Block successfully mined!');
    this.chain.push(block);

    this.pendingTransactions = [];
  }

  /**
   * Add a new transaction to the list of pending transactions (to be added
   * next time the mining process starts). This verifies that the given
   * transaction is properly signed.
   *