This paper analyzes the technical, economic and legal aspects of digital currencies, their relationship with classical money, market reviews, and trend estimates. An overview of their technical specifications is provided to help them better understand the security aspects and their current legal status in order to set certain assumptions about trends. It is evident that huge volumes of transactions are the result of a digital currency trading, and a minor part of the result is the exchange of goods. It is obvious that the driving force behind this trend of popularity is the speculative wave, caused by curiosity, desire for profit, and partly by ignorance, or by neglecting the fact that digital currencies are largely mutually substitutable. Although the system is transparent, those who enter first (creators) have the highest chance of earning if a particular currency "comes to life". Of course, the situation can be changed in ways of adjusting the legal system to new circumstances, thus preventing negativity and keeping the positive side of digital currencies. The hypothesis is that in the society in which we live, which is by its nature centralized and hierarchically organized, phenomena such as digital currencies, despite the technical possibilities, can not fully fulfill their task without the proper response of the institutions that manage the society by creating the appropriate legal and economic regulatory frameworks.