Blockchain-Based Secure Data Sharing Framework for Multi-Cloud Healthcare Systems

Healthcare organizations increasingly adopt multi-cloud infrastructures to improve scalability, availability, and operational resilience. However, healthcare data sharing across heterogeneous cloud environments introduces significant challenges related to privacy, security, interoperability, auditability, and regulatory compliance. Traditional centralized architectures often suffer from single points of failure, unauthorized access, and limited transparency. This paper proposes a Blockchain-Based Secure Data Sharing Framework for Multi-Cloud Healthcare Systems (B-SDSF-MCHS) that integrates Hyperledger Fabric, smart contracts, decentralized identity management, and attribute-based encryption to facilitate secure healthcare data exchange. The framework stores Electronic Health Records (EHRs) across multiple cloud providers while maintaining immutable audit trails on a permissioned blockchain network. Smart contracts automate consent verification, access authorization, and transaction logging. Experimental evaluation demonstrates improvements in security, integrity, transparency, and access efficiency compared to traditional cloud-based healthcare systems. Results indicate that the proposed framework achieves lower unauthorized access rates, enhanced traceability, and improved trust among healthcare stakeholders.

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