请在阅读本文之前或者之后，快速阅读完《精通比特币》的第1章到第7章。
在前文《比特币 (1)：传统货币和比特币的区别》中，大致了解了区块链的结构，其实区块链是这样的一个概念：
在没有短暂分叉的情况下，比特币系统只有一条链，这个链由一个一个的区块前后相连而成，下一个区块记录了上一个区块头的hash值，这就是连接起来的含义。每个区块由两部分组成：区块头和区块内容(一笔一笔的交易)，区块头和区块内容怎么联系起来呢？答案是：区块内容通过Merkle树生成根ID，记录在区块头上。Merkle树在后续的文章中会解释。
一、结构
该图片是从《精通比特币》第7章截取的。完全言简意赅的说明了区块链的结构。
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