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Personal data such as electronic medical records and academic records are critical and sensitive private information. These personal information is usually hosted across many data-custodian systems. Personal Data Store (PDS) is a service that lets an individual store, manage and deploy their key personal data in a highly secure and structured way. It also gives the user a central point of control for their personal information. One of the inherent problems of digital records is that it can be easily forged. Therefore, the data-consumer(with whom the data is shared) often needs to verify the authenticity of the shared document/record by communicating with the document/certificate issuing authority (e.g., data custodian). However, this process is time consuming and inefficient. In recent time, blockchain has gained tremendous attention from both industry and academia for distributed recording and immutable transactions …