With the quick selection of the Cloud-based Electronic Health Record ( EHR) frameworks, health providers are particularly concerned about overseeing cloud-based information protection. Current methodologies either have a flexibility bottleneck requiring patients to accept each sharing of their clinical details or a confidence bottleneck by providing a sole power control of each entry, thus increasing the issue of a single intention of attack. The exchange of electronic health records ( EHRs) has a very good centrality for infection studies and the commitment of specialists Lately, a cloud-based electronic health record sharing program has offered a range of conveniences, but cloud centralization unfailingly opens up risks to information security and safety. Blockchain innovation can be seen as a positive solution to addressing these issues by virtue of its one kind of decentralization, namelessness, unforgeability, and unquestionable status.

Keywords : Electronic Health Records, Data Sharing, Blockchain, Data Security, Privacy Preservation.