DEPARTMENTOFCOMPUTERSCIENCE

Healthcare data management in Nigeria remains challenged by fragmented record-keeping, poor interoperability, and heightened risks of data manipulation and security breaches. This study presents HealthChain Nigeria, a blockchain-inspired framework designed to deliver secure, tamper-proof, and interoperable medical record management geared toward the Nigerian healthcare ecosystem. The proposed system employs a Node.js backend with AES 256 encryption for file uploads, a simulated blockchain ledger (via JSON) to record consent and transaction hashes, and a simple web-based frontend for patient, clinician and administrator interface. Key implementation features include patient-controlled access rights (grant/revoke consent), encrypted record storage, and auditable transaction logs. Functional testing demonstrated successful workflows for record upload, consent management, and secure data retrieval only when access is granted. The prototype indicates that blockchain principles—immutability, decentralization, and transparency—can be adapted into resource constrained healthcare settings to enhance trust, streamline workflows, and protect patient data. The findings suggest that HealthChain Nigeria provides a viable pathway toward more inclusive,efficient and secure healthcare record systems indeveloping country contexts, with potentialforfullblockchainintegrationinthefuture.