Mediledger: Blockchain-Enabled Secure Health Record Sharing

MediLedger is a blockchain-based healthcare solution designed to enhance the security, privacy, and reliability of Electronic Health Records (EHRs). Traditional centralized EHR systems face challenges such as data breaches, unauthorized access, single point of failure, and limited patient control over medical records. MediLedger addresses these issues by leveraging decentralization, immutability, and encryption-based access control mechanisms. The system utilizes Ethereum Smart Contracts to manage permission rules for accessing health records, while IPFS (Inter Planetary File System) securely stores off-chain data to ensure scalability and reduce blockchain transaction load. AES encryption further strengthens data confidentiality during storage and retrieval. This hybrid blockchain architecture enhances patient autonomy, improves interoperability among healthcare providers, and ensures transparency through secure audit logs. Experimental results demonstrate reduced unauthorized access attempts, improved system reliability, and increased patient trust in digital healthcare systems. Keywords: Blockchain, Electronic Health Records (EHR), Ethereum Smart Contracts, IPFS, AES encryption, healthcare security, decentralization, patient autonomy, interoperability, data privacy.