• Jia Qu.
• Hebei Petroleum University of Technology, Information center, Hebei Petroleum University of Technology, Chengde, China.
• Medicine (Baltimore). 2022 Sep 2; 101 (35): e30507.

BackgroundA blockchain-based Electronic Health Record(EHR) data-sharing scheme was proposed to solve the problems of data sharing difficulties and privacy disclosure.MethodsThis paper designs a blockchain-based electronic health record model based on the characteristics of blockchain antitampering, decentralization, and distributed storage. Utilize blockchain network and distributed database to store encryption-related access control policies to prevent EHR data from being tampered with and leaked. Data security sharing protocol combines Distributed Key Generation (DKG) and reencryption.ResultsThe protocol used the Delegated Proof of Stake(DPOS) algorithm to select the proxy node, which reencrypted the EHR to share data between a pair of users. Simulation experiments and comparative analysis showed that DPOS efficiency was higher than Proof of Work (POW) and slightly lower than the Practical Byzantine Fault Tolerance(PBFT).ConclusionsThe scheme proposed in this paper is more decentralized and less computationally intensive.Copyright © 2022 the Author(s). Published by Wolters Kluwer Health, Inc.

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