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In this paper, we developed a Blockchain-based User Authentication Data-Sharing (BC-UADS) framework. In BC-UADS, several hospital servers form a consortium blockchain network to maintain the transparency, immutability, and authenticity of the patient's Electronic Healthcare (Record EHR) medical data. The BC-UADS framework allows doctors to share or retrieve a patient's EHR metadata from the blockchain network. Since, the metadata is stored on a blockchain platform, it is more secure and trusted for real-time applications to utilize the medical data. The data-sharing protocol of the BC-UADS framework is implemented based on Proof-of-Reputation consensus algorithm in a blockchain network. The BC-UADS framework is analyzed in the AVISPA (Automated Validation of Internet Security Protocols and Applications) tool, demonstrating that it is secure against active and passive attacks. Besides, the BC …