Extended Privacy Preservation of Health Official Document using blockchain

Currently, new models such as mobile clouds and data warehouses have been selected to handle records. This approach reduces costs and increases availability. However, these technologies face some problems due to uncertainties, such as data privacy, flexibility, network security, attacks, and missing transparency. In particular, sensitive applications data such as medical certificates, data distribution, and student certificate maintenance. It is essential to check the reliability of these applications. The number of scams on this issue is increasing day by day. Therefore, in this paper, we propose a blockchain-based model for the issuance and distribution of medical certificates. It reduces fraud on medical certificates such as birth, death, and sick leave due to the blockchain technical features such as immutability, transparency, security, and distribution. Furthermore, this application's vital purpose is to quickly analyze and estimate the birth and death rate due to blockchain symptoms. As part of the literature survey number of existing works were interpreted as part of the literature survey, but the maximum number of documents failed to show their implementation with the results. The main strength of the paper is the literature survey, results, and analysis. Distributed based public blockchain and metamask used to develop the proposed framework. The results show medical certificate generation and verification and the gas(cryptocurrency) consumption to store certificate credentials into a blockchain as a transaction