In 2008, a man under the mysterious name Satoshi Nakamoto was introduced to white paper Bitcoin, in which his protocol was described. In this document it was said that Bitcoin is a peer-to-peer payment system on blockchain. On January 3, 2009, the Bitcoin network was launched. It was the first cryptocurrency in the world. The innovation of this money that their release does not need centralized organization in the form of governments and banks. This function is performed by a cryptographic algorithm, thanks to which anyone can participate in the creation of new coins. Also, in contrast traditional money, Bitcoin emissions are limited. According to the algorithm, only 21 million coins will be create, with every 4 years, the number of mined coins will be halved, starting with 50 coins.All actions within the network (transactions, mining blocks, etc.) are recorded in the block every 12.5 minutes and can be tracked. So, this payment system is completely transparent. All these blocks are connected in series with each other, the chain of these blocks is called blockchain.The more nodes are deployed (the device on which the full history of the blockchain bitcoin is loaded), the more decentralized the network is and the less susceptible to hacker attacks.