Recently, more and more representatives of the official authorities of various states and businesses recognize that the crypto currency starts to displace the usual currency in carrying out various financial transactions. However, in my opinion, this will concern the banking sphere, the sphere of business, mutual settlements between individuals and legal entities, and also only in certain part of payments for goods and services in our daily life. In addition, this process will be very time-consuming and will take many decades. In general, I do not think that the crypto currency in the foreseeable future will completely replace the currency fiat.