
作用:一个简单的区块
{"index":0,"timestamp":"","transactions":[{"sender":"","recipient":"","amount:5,}],"proof":"","previous_hash":"",}
{"index":0,#索引"timestamp":"",#时间戳"transactions":[#交易信息{"sender":"",#交易发送者"recipient":"",#交易接收者"amount:5,#交易金额}],"proof":"",#工作量证明"previous_hash":"",#上一个区块的哈希值}