Blockchain and Chainlink Oracle Integration in EHR: Ensuring Real-Time Data Integrity and Interoperability With Ethereum, Hyperledger Fabric, and IPFS Storage

Healthcare systems face challenges in ensuring robust security, achieving scalable operations, and maintaining optimal efficiency, mainly attributable to the inherent constraints of conventional centralized architectural frameworks. These traditional systems have limitations that compromise healthcare delivery, affecting patient care quality, data integrity, and operational effectiveness. This research proposes a hybrid blockchain framework that integrates Hyperledger Fabric, Ethereum, and the Interplanetary File System (IPFS) to enable secure, scalable, and interoperable healthcare data management. Testing with simulated healthcare data across three institutional nodes demonstrated a significant 64% reduction in data retrieval time compared to traditional systems while maintaining exceptional 99.8% uptime reliability. Chainlink oracles serve as sophisticated bridges for cross-chain communication, securely transmitting data between blockchain networks while preserving complete data integrity. The framework ensures HIPAA and GDPR compliance through advanced AES-256 encryption protocols, immutable audit trails, and patient-controlled access mechanisms. The implementation results conclusively demonstrate that the hybrid model improves data security and interoperability while reducing operational costs by approximately 37% compared to current centralized solutions. This research establishes the transformative potential of hybrid blockchain frameworks in revolutionizing healthcare data environments by providing technically viable and economically efficient solutions to manage sensitive medical information.