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Healthcare is the most crucial sector in people's life. Many applications and systems have been proposed to improve the healthcare area. The outbreak of the novel coronavirus Covid19 turns more focus on healthcare applications. To manage medical data, healthcare professionals in developed countries have adopted several electronic healthcare information systems and technologies in recent years. However, these technologies show serious privacy risks and security issues, especially in the transfer of data and the recording of data transactions. Furthermore, the high cost of these technologies acquisition, as well as the complexity of their management, make their application in underdeveloped nations extremely problematic. This article proposes a solution based on a decentralized Blockchain architecture to reinforce the security of health information systems. This solution is particularly recommended for developing countries which lack high-tech infrastructures and suffer from poor interoperability between existing information systems. Various researches and works that implement blockchainbased solutions in the security of electronic health information systems (eHIS) are discussed in this article. A new approach based on a hyperledger fabric, implementing smart contracts and several other components is proposed. The suggested architecture involves many actors who can interact with medical records such as patients, doctors, pharmacists, laboratories and insurance companies. Data privacy is guaranteed because there is minimal risk of unauthorized access entities, and by design, the smart contract is the sole way to manipulate participant data. Various optimization and measurement experiments were carried on. The results covering various key parameters of system performance such as throughput, latency, CPU usage, memory consumption and network usage are presented. [ABSTRACT FROM AUTHOR]

The article considers the issues of formation and maintenance of an integrated information management system in the education sector, as well as the development of e-education on the example of the Republic of Estonia — a regional and one of the world leaders in the field of digital transformation of education. The history and specificity of the information system in the Estonian education sector (EHIS) is analyzed in the context of the development of e-government technologies. The principles for the processes of collecting, processing and analyzing information in the education sector in Estoniaare presented, the expanded analytical capabilities of the information system containing personal data of various categories of participants in the educational process are described. The issues of ensuring confidentiality and integrity of information based on digital signature and blockchain technology are considered. The economic and social effect of the implementation of an integrated information system in the education sector has been revealed. The structure of e-learning services in Estoniaand their role in providing digital transformation of the education system are considered. As a result of the analysis of the Estonian experience in the formation of an integrated information system in the education sector, as well as the development of e-education services, scientifically based recommendations for the modernization of the education system of the Republicof Belarushave been developed.