Wikipedia对区块链的描述如下：
Wikipedia describes the block chain as follows:
?A blockchain, originally block chain, is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Each block typically contains a cryptographic hash of the previous block, a timestamp and transaction data. By design, a blockchain is inherently resistant to modification of the data. It is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way". For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks, which requires collusion of the network majority.
简单整理下，区块链系统包含下面这些元素：
Simplely sorted, the block chain system contains the following elements:
数据：存储在区块链中的数据可以是交易记录，也可以是智能合约等信息；
Data: data stored in block chains can be transaction records or information such as smart contracts;
区块：用于保存数据；区块有一个区块头，其中包含本区块的哈希值，前一区块头的哈希值及时间戳，区块ID等信息；
Blocks: for data preservation; blocks have a block head that contains the Hashi value of the block, the Hashi value and time stamp of the previous block, block ID, etc.;
链：区块组成一个链表，第一个区块被称为创始块，后面区块按照上面提到方式添加到链上，而且只能添加不能删除修改；
(a) Chains: blocks form a chain table, the first of which is referred to as founding blocks, the latter being added to the chain in the manner mentioned above, and only to add changes that cannot be removed;
分布式：他是一个分布式系统，与其他分布式系统不同的是，系统中的每个节点都会保存完整的数据（一些实践可能会不同，但至少要多数节点）
Distribution: He is a distributed system and, unlike other distributed systems, every node in the system keeps complete data (some practices may differ, but at least most nodes)
安全的：数据不会被篡改，每个区块都记录着他前一区块的哈希值，改变区块的内容其哈希值都会改变，意味着该区块后的所有区块都要修改；再者，所有节点都存储完整链表，如果说更改单一节点还有可能的话，那么更改所有（多数）节点基本上是难以实现的，所谓折一筷易，折百筷难。
Security: The data will not be tampered with; each block records the Hashi value of his previous block, and changing the content of the block will change its Hashi value, meaning that all blocks after the block will be modified; and, again, all nodes store complete chain tables, and if it is possible to change a single node, changing all (most) nodes is essentially difficult to achieve, so-called one chopstick and one chopstick.
透明的：任何节点的操作，其他节点都会感知到，存在链上的数据都会被验证，也进一步提供了安全互信。
Transparency: The operation of any node, other nodes will feel that the data on the chain of presence will be validated and provide further security mutual trust.
去中心化：不存在中心节点，关键节点，从而提供了高可靠性，但同时也有分布式系统一致性问题，现在不同产品使用了不同的一致性算法，譬如比特币中的POW，以太坊POW+POS等等
Decentralization: there are no central nodes, key nodes, providing high reliability, but there are also distributed system consistency issues, and different consistency algorithms are now used for different products, such as Pow in Bitcoin, Taipan Pow+POS, etc.
从区块链的技术特点可以看到，他适合需要跨组织/个体的一些场景。
As can be seen from the technical characteristics of the block chain, he is suited to a number of scenarios that require cross-organization/individuals.
WIP
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