Abstract: Despite the constant improvement of data protection technologies and the creation of new tools, their vulnerability in modern conditions not only does not decrease, but also constantly increases. This is due to the fact that attackers are always one step ahead of cybersecurity specialists, and preventive measures cannot cover all possible vectors of attacks. Therefore, the urgency of issues related to information security is growing. The problem of information security is multifaceted, complex and covers a number of important tasks. For example, data confidentiality, which is ensured by the use of various methods and tools (encryption closes data from third parties, as well as solves the problem of their integrity); identification of the user on the basis of the analysis of the codes used by them for confirmation of the rights to access to system (network), to work with data and on their maintenance (it is provided by entering of the corresponding passwords, use of biometric data). Obviously, over time, the number of devices will only grow, and with it the issue of information security. Today, the most reliable systems for controlling access to information, which do not use cards, keys, tokens, passwords and which cannot be stolen or lost, are biometric systems for controlling access to information. However, even biometric data can be forged — for example, make a copy of a fingerprint from the surface and safely bypass the protection system. All modern information security technologies are vulnerable — to a greater or lesser extent. Blockchain is a technology that, through the use of cryptography chains and hash functions in blocks, solves most security problems to date. Blockchain technology solves the problem associated with the lack of guarantees from intermediaries who act as third parties in the implementation of certain actions. Blockchain technology has the potential to provide absolute integrity and confidentiality, while providing personal information if necessary. This increases the security of the resource. The article provides an overview of the basic principles of the architecture of blockchain technology in terms of the use of this technology in information security.