Actually, the opportunity exists to obtain admittance to various data. The article presents the essence of approach to development of decentralized prototype of system managing medical records of patient using blockchain technology. The global analysis of cloud technologies using various experience of their implementation is given. The scientific novelty of study consists in step-by-step application of genuine prototype of patient medical data management system using blockchain technology. It is scientifically justified that applying cloud technologies in medicine permits to improve safety and integrity of medical data of patient and to support linking uncoordinated databases into one whole, making interaction of patients and physicians much more effective and comfortable.