Digital money appeared in the nineties of the last century. Cryptocurrency is a digital money subtype that works based on cryptographic algorithms. Bitcoin is the first cryptocurrency in history and the first form of digital money that uses cryptographic algorithms to transfer values. For example, bitcoin addresses are generated from a private key based on asymmetric cryptography. Furthermore, all bitcoin transactions include digital signatures, which is also a method of cryptography. After bitcoin gained popularity, many copies of this digital currency appeared. What is common to all these copies is that they also contain cryptographic algorithms in their core, and therefore copies of bitcoin are also called cryptocurrencies (so called altcoins). Since January this year, the value of bitcoin, which depends on the number of customers and mathematical calculations, has jumped multiple times and its current price is $ 18,755. It is only a matter of time when bitcoin market value exceeds one hundred billion US dollars. Along with its sudden growth, there also comes a warning about a potential crack of this economic bubble as well as a downfall of many other monetary products linked to bitcoin that the investors were pushing.