According to transaction data, the price of bitcoin, the most popular cryptocurrency, broke the record again, rising to $49998, close to the psychological threshold of $50000. Bitcoin prices reached $49707 on the 4th, but then began to fall, down 8%. The concept of bitcoin was first proposed by Nakamoto on November 1, 2008, and was officially born on January 3, 2009. According to Nakamoto’s idea, the open source software is designed and released and the P2P network on it is constructed. Bitcoin is a kind of P2P virtual cryptocurrency. Point to point transmission means a decentralized payment system.