GoldenTime: A Blockchain-Based Decentralized Medical Identity And Emergency Response System

Author

Akshay A D, Kiran K P, Mahendra M, Marula Kumar D S, Ms. Deepti H G

Abstract

 Healthcare data management faces significant challenges including fragmented records, risk of unauthorized modification, and critical delays during medical emergencies. GoldenTime is a blockchain-integrated medical record management system built on the MERN stack and Ethereum smart contracts that addresses these challenges. The system introduces a dual-tier data model where non-confidential emergency data such as blood group and allergies are publicly accessible via a QR-based Emergency Grid, while confidential records are exposed only through contract functions restricted to on-chain authorized doctors. A Solidity smart contract named GoldenTimeLedgerV3 serves as the immutable data layer, enforcing role-based access through the onlyAuthorized modifier. The backend is implemented using Node.js and Express.js with MongoDB for off-chain mirroring, Cloudinary for file storage, and Nodemailer for OTP-based two-factor authentication. The frontend is built with React 19 and Ethers.js v6 for direct blockchain interaction. The system was deployed and tested on the Ethereum Sepolia test network. Results demonstrate tamper-proof record storage, instant emergency data retrieval without authentication, and a complete doctor credential verification workflow.

Keywords

blockchain; healthcare; Ethereum; smart contract; electronic health records; QR code; MERN stack; decentralized; emergency access; Solidity

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References

1.Chouhan, G. K., Singh, S., Jaduvansy, A., Rai, P., & Rath, A. (2025). A blockchain based decentralized identifiers for entity authentication in electronic health records. Proc. 2025 Int. Conf. Intelligent and Cloud Computing (ICoICC), 1–6.
https://doi.org/10.1109/ICoICC64033.2025.11052007

2.Devi, T., Kamatchi, S. B., & Deepa, N. (2023). Enhancing the security for healthcare data using blockchain technology. Proc. 2023 Int. Conf. Computer Communication and Informatics (ICCCI), 1–7. https://doi.org/10.1109/ICCCI56745.2023.10128545

3.Divyashree, D., & Ravi, C. (2024). A comprehensive review of blockchain based secure EHR: Addressing challenges and unlocking opportunities in healthcare data management. Proc. 2024 3rd Int. Conf. Innovation in Technology (INOCON), 1–6. https://doi.org/10.1109/INOCON60754.2024.10511953

4.Guo, H., Li, W., Nejad, M., & Shen, C.-C. (2023). A hybrid blockchain-edge architecture for electronic health record management with attribute-based cryptographic mechanisms. IEEE Transactions on Network and Service Management, 20(2), 1759–1774.
https://doi.org/10.1109/TNSM.2022.3186006

5.Hamela, K., Shrivastava, G., Umapathi, P., Bankar, J. S., Chaudhary, S. D., & Kisan, R. (2024). Enhancing data security and privacy in electronic health records with blockchain technology. Proc. 2024 4th Int. Conf. Technological Advancements in Computational Sciences (ICTACS), 1829–1835. https://doi.org/10.1109/ICTACS62700.2024.10841078

6.Khatiwada, P., Yang, B., & Skjelvik, A. (2022). Reference design model for a patient-centric data exchange healthcare environment. Proc. 2022 3rd Int. Conf. Human-Centric Smart Environments for Health and Well-being (IHSH), 49–56. https://doi.org/10.1109/IHSH57076.2022.10092114

7.Ramzan, S., Aqdus, A., Ravi, V., Koundal, D., Amin, R., & Al Ghamdi, M. A. (2023). Healthcare applications using blockchain technology: Motivations and challenges. IEEE Transactions on Engineering Management, 70(8), 2874–2890. https://doi.org/10.1109/TEM.2022.3189734

8.Rudrakar, R., Puri, C., Lichade, A., & Shiralaskar, H. (2025). Blockchain innovation for healthcare data security. Proc. 2025 2nd Int. Conf. Electronic Circuits and Signaling Technologies (ICECST), 1138–1143.
https://doi.org/10.1109/ICECST66106.2025.11307662

9.Tariq, U. U., Sabrina, F., Rashid, M. M., Gordon, S., Lin, Y., Wang, Z., & Azad, S. (2025). Blockchain-based secured data sharing in healthcare: A systematic literature review. IEEE Access, 13, 45415–45435. https://doi.org/10.1109/ACCESS.2025.3547953

10.Utami, R. T., Lubis, V. H., Royani, Santoso, N. P. L., Rizky, A., Komara, M. A., & Suryadi, L. (2025). Blockchain technology for securing electronic health records and enhancing data privacy. Proc. 2025 4th Int. Conf. Creative Communication and Innovative Technology (ICCIT), 1–7. https://doi.org/10.1109/ICCIT65724.2025.11167542

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