简单理解区块链知识
  package com.redis.testRedis;  import java.util.ArrayList; import java.util.Arrays; import java.util.List;  import com.alibaba.fastjson.JSON;  public class BlockChain {      public static void main(String[] args) {         List blockChainList =  new ArrayList();          Block genesis = new Block("BlockChain", 0);         blockChainList.add(genesis);         Block helloBlock = new Block("Hello", blockChainList.get(blockChainList.size()-1).getHash());          blockChainList.add(helloBlock);          Block worldBlock = new Block("World", blockChainList.get(blockChainList.size()-1).getHash());         blockChainList.add(worldBlock);         Block dZoneBlock = new Block("DZone", blockChainList.get(blockChainList.size()-1).getHash());          blockChainList.add(dZoneBlock);          System.out.println("---------------------");          System.out.println("- BlockChain -");          System.out.println("---------------------...
