The article considers the possibility of using blockchain technology for automated maintenance of technical data sheets of information systems. An analysis of traditional documentation management methods has been carried out, and their disadvantages have been identified, including high time costs, audit complexity, and the risk of unauthorized data modification. The concept of an electronic technical passport system based on a decentralized registry and the use of smart contracts for automatic control of configuration changes and software updates is proposed. The simulation results showed that the introduction of blockchain technology reduces the processing time of changes from 4–6 hours with the traditional approach to 3–5 minutes, which is equivalent to speeding up the process by 50–100 times. The immutability of records, transparency of operations and automatic verification of data for compliance with security requirements are ensured. The developed system increases the efficiency of information security management, reduces the influence of the human factor and simplifies the audit process. The proposed solution is promising for implementation in mission-critical automated systems where strict control over the state and security of information resources is required. Further research may be aimed at integrating with threat monitoring systems and developing adaptive data access control mechanisms in the blockchain registry.