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cryptocurrency payments from all over the world Blockchain is a decentralized ledger. This is a computer network that has an identical copy of the database and changes its status (notes) into a collective agreement based on pure mathematics. All this means that there is no need for a central server or any entity that we trust (eg central bank, notary public, bank, Paypal, etc.). Blockchain is a technology base for all cryptocurrency, be it Bitcoin, Ethereum, Hyperledger, etc. An important part of the blockchain is a smart contract, a piece of code stored on the blockchain network (in each participant's database). This basically defines the conditions under which all parties use contractual agreements. Therefore, if the necessary requirements are met, certain actions are carried out. Because smart contracts are stored on all computers on the network, everyone must run it and get the same results. In this way the user can be sure that the results are correct. Blockch