With the development of information and storage technologies, electronic document recording has become an unalterable trend, which transforms the way that people store, access and operate the data generated in various applications. Healthcare is the leader application domain that pioneers in usage of electronic medical records (EMRs). Cross-organizational EMRs' sharing has many constructive effects in motivating the domain innovation, introducing better domain understanding and overall the domain intelligence. However, the privacy concern, trust issue as well as the sophisticated legal regulation of the sensitive EMRs' use leads to inefficiency in the data sharing process. In this paper, we propose a cross-organizational medical data sharing framework based on permissioned blockchain technology, named “EMRShare“, to resolve the trust concern existing in EMRs sharing practice among different participants like patients, clinicians and researchers, and other relevant parties such as the insurance agent and government, to make medical data sharing and access secure, efficient, transparent, immutable, traceable and auditable. A working prototype system is implemented to demonstrate the key features for the cross-organizational medical data sharing and access management. The objective of this work targets at explaining the essential design considerations along with the working principle and operation logics using the blockchain technology to facilitate the medical data sharing in a highly-cooperative healthcare ecosystem.
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