Healthcare systems worldwide face critical challenges in patient data management, including fragmented medical records, limited interoperability between providers, security vulnerabilities, and patient privacy concerns. This paper presents a comprehensive framework for implementing blockchain-enabled Universal Health Records (UHR) that addresses these fundamental limitations through decentralized architecture and cryptographic security. Our proposed solution leverages distributed ledger technology to create a patient-centric ecosystem where individuals maintain sovereign control over their health data while enabling authorized healthcare providers to access complete, accurate medical histories in real-time. A pilot implementation across three healthcare facilities (n=150 patients) using traditional EHR systems demonstrated significant improvements: 67% reduction in patient record retrieval time (from 12.3 to 4.1 minutes), 89% decrease in data inconsistencies between providers, and 94% patient satisfaction with data access transparency. Security testing revealed zero unauthorized access attempts over 6 months, while maintaining 99.7% system uptime. Through comprehensive analysis of technical architecture, security protocols, and implementation strategies, this paper demonstrates how blockchain technology can transform healthcare data management, offering a technically feasible, economically viable, and regulatory-compliant pathway toward universal health record interoperability.

Blockchain, Healthcare Interoperability, Electronic Health Records, Patient Privacy

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