Mining is the backbone of digital currency. It guarantees four main functions: confirmation of operations, protects the blockchain from incorrect data (false transactions, etc.), protects the network from attacks, supports a decentralized network system, an operation carried out by two network users must always be confirmed by participation in a data block. The miner accepts the operation and adds it to the block. Then the coins taken into account in the operation are used in the future. Fraudsters trying to forge blocks are sorted out at the initial stage of block-creation.