The challenge of guaranteeing data reliability is growing along with the sharp increase in data traffic in computer networks. At the moment, blockchain technologies based on distributed ledgers are a useful means of boosting data reliability in networked information systems. Blockchain technologies based on a distributed ledger mainly provide effective results in increasing the reliability of digital data. In this study, an algorithm for creating a distributed registry was developed to ensure data reliability. The use of consensus algorithms to achieve a distributed registry, traditional consensus algorithms, and hybrid algorithms, and their tasks are mentioned. A method of applying consensus and controlling risks affecting it has been developed. A neutron network model has been developed to implement consensus and control the risks that affect it. Mechanisms for increasing data reliability based on the use of cryptographic methods are proposed in blockchain technologies. Based on the developed methods and algorithms, the dependability of digital data in information systems can be guaranteed.