区块链其实就相当于一个去中介化的数据库，是由一串数据块组成的。它的每一个数据块当中都包含了一次比特币网络交易的信息，而这些都是用于验证其信息的有效性和生成下一个区块的。
The block chain actually amounts to a de-intermediated database, consisting of a series of data blocks. Each of its data blocks contains information on a Bitcoin network transaction that is used to verify the validity of its information and generate the next block.
狭义的来讲，区块链是就是一种按照时间顺序来将数据区块以顺序相连的方式组合成的一种链式数据结构，并以密码学方式保证的不可篡改和不可伪造的分布式账本。
In a narrow sense, the block chain is a chained data structure that sequences data blocks into sequentially linked data blocks and ensures in cryptographically non-falseable and non-false distributed books.
而从广义来讲，区块链其实是一种分布式基础架构与计算方式，它是用于保证数据传输和访问的安全的。
In a broad sense, the block chain is in fact a distributed base structure and calculation that is used to ensure the safety of data transmission and access.
区块链分类
Block Chain Classification
1、公有
1. Public
公有区块链（Public Block Chains)是指：世界上任何个体或者团体都可以发送交易，且交易能够获得该区块链的有效确认，任何人都可以参与其共识过程。公有区块链是最早的区块链，也是应用最广泛的区块链，各大bitcoins系列的虚拟数字货币均基于公有区块链，世界上有且仅有一条该币种对应的区块链。
The public block chain (Public Block Chains) means that any individual or group in the world can send a transaction and the transaction can be validly confirmed in the block chain, and anyone can participate in the consensus process. The public block chain is the earliest and the most widely applied block chain, with virtual digital currencies in the big bitcoins series based on a public block chain with a worldwide chain of blocks with and only one corresponding to that currency.
2、联合
2. United
行业区块链（Consortium Block Chains)：由某个群体内部指定多个预选的节点为记账人，每个块的生成由所有的预选节点共同决定（预选节点参与共识过程），其他接入节点可以参与交易，但不过问记账过程(本质上还是托管记账，只是变成分布式记账，预选节点的多少，如何决定每个块的记账者成为该区块链的主要风险点），其他任何人可以通过该区块链开放的API进行限定查询。
The industry block chain (Consortium Block Chains): multiple preselected nodes are designated as bookkeepers within a group, the generation of each block is determined by all preselected nodes (preselection nodes are involved in the consensus process) and other access nodes can be involved in the transaction, although limited queries can be made by any other person through API, which is open in the block chain (in essence or as a trustee, is merely a distributed account, the number of preselected nodes, and how to determine how the booker of each block becomes the main risk point in the block chain).
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