The healthcare sector faces significant challenges in securely managing and storing patient data. This paper introduces a Blockchain-based Medical Record Storage System (BMRS), which provides a decentralized and secure framework for healthcare data management. Utilizing blockchain’s decentralization and immutability, BMRS offers a robust solution for storing and sharing sensitive medical data. In this model, patients have full control over their medical records and can grant or revoke access to other stakeholders. Healthcare professionals gain secure, real-time access to patient information, improving diagnosis and treatment, while insurance providers benefit from enhanced data integrity and reduced fraud through tamper-proof records. Each medical interaction is recorded as a transaction on the blockchain, creating a secure and unalterable record of patient history. Key features include cryptographic access control, compliance with regulations like HIPAA and GDPR, and smart contracts to automate data access. The system has been implemented and evaluated based on security, scalability, and transparency, demonstrating its potential to enhance privacy, trust, and collaboration in healthcare.