比特币白皮书：点对点电子货币系统

摘要：纯粹的点对点式的电子货币，使组织/团体/个人之间在线支付不再需要金融机构参与（比如：银行、支付宝、财富通）。仅仅有数字签名，还不能完全实现点对点式的电子货币系统，因为它不能解决双重支付的问题，也就体现不出“不再需要金融机构参与”的优点。这篇白皮书推荐一种方案，可以解决点对点式的电子货币的双重支付问题

The network timestamps transactions by hashing them into an ongoing chain of
hash-based proof-of-work, forming a record that cannot be changed without redoing
the proof-of-work. The longest chain not only serves as proof of the sequence of
events witnessed, but proof that it came from the largest pool of CPU power. As
long as a majority of CPU power is controlled by nodes that are not cooperating to
attack the network, they'll generate the longest chain and outpace attackers. The
network itself requires minimal structure. Messages are broadcast on a best effort
basis, and nodes can leave and rejoin the network at will, accepting the longest
proof-of-work chain as proof of what happened while they were gone.