Blockchain-based secure data sharing framework for healthcare IoT systems

Abstract

This paper proposes a blockchain-based framework for secure and privacy-preserving data sharing across healthcare IoT devices. The system utilizes Hyperledger Fabric with custom smart contracts to enforce granular access control policies while maintaining HIPAA compliance. Experimental results on a testbed of 50 simulated medical devices demonstrate throughput of 1,200 transactions per second with end-to-end latency under 800ms.

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The framework implements a permissioned blockchain network using Hyperledger Fabric v2.5 with three organizations representing hospitals, clinics, and laboratories. Smart contracts (chaincode) written in Go enforce attribute-based access control (ABAC) policies. Patient consent is managed through a dedicated consent channel. Performance testing with Hyperledger Caliper shows sustained throughput of 1,200 TPS with 4 orderer nodes and 8 peer nodes.

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