The concept of Bitcoin (Bitcoin) was first proposed by Satoshi Nakamoto on November 1, 2008, and was officially born on January 3, 2009. The open source software designed and released according to Satoshi Nakamoto's ideas and the P2P network built on it is a digital encrypted currency for peer-to-peer (P2P) transmission, with a total of 21 million pieces. Bitcoin is generated through a large number of calculations based on a specific algorithm, and does not rely on the issuance of a specific currency institution. It uses a distributed database composed of many nodes in the entire P2P network to confirm and record all transaction behaviors, and uses cryptography to ensure currency circulation. Link security ensures that the currency value cannot be artificially manipulated by mass production of bitcoins. The design based on cryptography allows Bitcoin to be transferred, paid and cashed only by the real owner, and also ensures the anonymity of currency ownership and circulation transactions.