A specific feature of cryptocurrencies is that they are generally not issued by any centralized authority. As such, they are considered by many investors to be immune to attempts at manipulation or government intervention. To create and secure them, virtual currencies use state-of-the-art blockchain. Blockchain is a technology that, today, is almost impossible to break and / or falsify. Through this "blockchain" as it would be translated into Romanian, cryptocurrency transactions are divided into many small pieces, which are stored and managed by a group of computers. Thus, in order for someone to be able to decode the code of a crypto, they should have access to all the computers that store these small pieces.