In the last ten years, cryptocurrencies have been used as an alternative to printed money. Many investers and investment companies at that time predicted a large decline in the value of cryptocurrencies and a rapid collapse of the entire cryptocurrency market. However, the exact opposite happened. Cryptocurrencies still exist today, and some of them have achieved so much value that they are being invested for the long run. Cryptocurrencies are based on a Peer-toPeer system that simbolizes trading directly, without intermediaries or third parties. Transactions within the system are stored in publicly distributed book called a blockchain. The system usses its own unit called Bitcoin. Bitcoin has a decentralized digital currency which implies that there is on central organization like a bank or a state that manages the entire system. Blockchain has a big impact on the world we live in today. As a rule, all the largest global companies such as Walmart, Google, Facebook, IBM use it in some way in their business. If introduced in the right way in the future, the benefits for the users could be significant in terms of higher service speeds and additional security of network communication.