Blockchain is In a database that keeps records that are needed constantly They are called blocks, and they are encrypted and linked to each other, and each unit of the blocks contains an encrypted number for the previous block and data that is a digital ledger, and it is used as a blockchain to record transactions across many computers, as the record cannot be changed without changing all subsequent blocks and the consensus of the network, which made it the first digital currency .It provides the creator of blockchain technology and develops the blockchain.