Blockchain is a system for recording information, making it difficult or impossible to modify, hack, or deceive the system. In fact, the blockchain is a digital record of transactions, copied by the system informatics on the blockchain and distributed on the network. Each block in the chain contains many transactions, and every time a new transaction occurs on the blockchain, a record of that transaction is added to the ledger of each participant. The decentralized database managed by multiple participants is called Distributed Ledger Technology (DLT Blockchain). It is a type of DLT that uses immutable cryptographic signatures called HASH to record transactions. This means that when a block in the chain changes, it is obvious that it has changed. Each block in the chain is in all distributed versions of the chain.