In traditional healthcare systems, medical records are stored in centralized databases which are vulnerable to data breaches, unauthorized access, and data manipulation. Patients often face difficulty in accessing and sharing their medical history across hospitals. To overcome these challenges, this paper presents a Blockchain Based Medical Record. The proposed system uses blockchain technology to securely store and manage patient medical records in a decentralized manner. Each medical record is stored as a block containing encrypted patient data and a unique hash value. Only authorized users such as doctors and hospitals can access the records using proper authentication. The system ensures data integrity, transparency, and security while giving patients control over their medical information. This solution improves trust, reduces fraud, and enhances healthcare data management.

The Blockchain Based Medical Record Management System provides a secure and decentralized solution for storing and managing healthcare data. By integrating blockchain technology, cryptographic hashing (SHA-256), and role-based authentication, the system ensures data integrity, privacy, and transparency. Unlike traditional systems where data can be altered or hacked, blockchain ensures immutability of records. This enhances trust between patients, doctors, and healthcare institutions. The proposed system reduces the risk of data breaches and improves the efficiency of medical data sharing. Future enhancements may include: Smart contract integration for automated access control Cloud-based blockchain deployment Mobile application integration AI-based medical record analytics Integration with national healthcare databases The system represents a modern, secure, and scalable approach to digital healthcare management.

1.Satoshi Nakamoto, “Bitcoin: A Peer-to-Peer Electronic Cash System”, 2008. 2.IEEE, “Blockchain Technology for Healthcare Applications”, IEEE Access Journal. 3.MIT Media Lab, “MedRec: Using Blockchain for Medical Data Access and Permission Management.” 4.Xia, Q., Sifah, E.B., et al., “MeDShare: Trust-Less Medical Data Sharing Among Cloud Service Providers via Blockchain.” 5.Kuo, T.T., Kim, H.E., Ohno-Machado, L., “Blockchain Distributed Ledger Technologies for Biomedical and Healthcare Applications.” IBM, “Blockchain in Healthcare: Secure Medical Data Management.”

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