The blockchain is a group of distributed client nodes, and a decentralized database of all participants is a record of all bitcoin transaction history. Satoshi Nakamoto expects that when the amount of data increases, the user hopes that these data will not all be stored in its own node. In order to achieve this goal, he introduced a hash function mechanism. In this way, the client will be able to automatically eliminate those parts that it will never use, such as very early Bitcoin transaction records. Satoshi Satoshi created the first block of the bitcoin24mining.com system, the "Genesis Block", and attached the sentence "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks." The front page article title.