The article is an overview of cryptocurrencies from the perspective of the regulation of the Criminal Procedure Code and on the background of selected types of crimes from the Penal Code, i.e.: money laundering, hacking, theft, and e-terrorism. The author expresses his concern about the continuous lack of a complementary law regulating the matter of cryptocurrencies in the Polish legal system, but he also notes that the first such significant step forward was the implementation by Poland of the EU Directive AML-V.