With the development of information technology, digital (electronic) cash systems are becoming increasingly popular. Digital cash has a number of advantages over conventional currency, and the number of advantages grows as information technology is integrated into public life. The aim of the study is to highlight the advantages of digital cash systems over conventional banknotes, provide a classification of various types of digital cash, compare existing electronic currency systems, and identify the vulnerabilities of modern digital cash systems. Comparison of various systems is carried out according to such criteria as the ability to work without communication with servers, a variety of authentication methods, copy protection methods, etc. At the end of the research, it will be possible to draw conclusions regarding the world's readiness for a massive transition to digital cash systems, the advantages and disadvantages of this or that type of electronic cash, highlight vulnerabilities in modern types of electronic cash, and make a forecast for the development of digital cash in the future.