Abstract. The relevance of the problem mentioned in the title is due to the rapid spread in Ukraine (and not only) of information technologies. It leads to the virtualization of many areas of society, and therefore to the growing importance of storing, transmitting and protecting information electronically, which is processed in global and local information systems using information technologies. Among the latter, according to many scientists (and not only in the IT sphere), Blockchain technology belongs to the leading place (and in the near future this trend will only increase).