Decentralized Privacy Preserving Data Sharing Model for Electronic Health Records (EHR) Using Blockchain Technology

Decentralized Privacy Preserving Data Sharing Model for Electronic Health Records (EHR) Using Blockchain Technology R. Rajakarthik Department of Computer Applications Vels Institute of Science, Technology & Advanced Studies (VISTAS) Chennai India https://orcid.org/0009-0009-9663-5273 Sumalatha V Department of Computer Applications Vels Institute of Science, Technology & Advanced Studies (VISTAS) Chennai India R Rajalingam Department of Artificial Intelligence and Data Science Engineering Panimalar Engineering College Chennai India ABSTRACT

In centralized systems prone to data breaches and single points of failure, issues about security, privacy, scalability, and real‐time sharing of electronic health records (EHRs) have arisen in the context of healthcare digitization. To tackle these problems, this paper proposes blockEHR, a decentralized EHR sharing system that uses blockchain technology and protects users' privacy. To communicate health data securely in real time, the suggested method employs Internet of Medical Things (IoMT) devices, edge computing, and a permissioned private Ethereum blockchain. Data collected by IoMT sensors is confirmed at the edge by means of digital signatures, identity cross‐referencing, and GPS‐based verification. Data on blockchains is protected by smart contracts and access controls based on roles. Both AES‐256 encryption and SHA‐256 hashing ensure the security of the data. In real time, the system can handle 1850 records/second with minimal latency and great throughput, according to the experiments. The findings demonstrate that blockEHR maintains patient privacy and allows practical healthcare applications while being a secure, scalable and effective decentralized method for managing electronic health records.
04 24 2026 01 2026 e70037 10.1049/blc2.70037 2 10.1002/crossmark_policy ietresearch.onlinelibrary.wiley.com true 2025-09-13 2026-04-15 2026-04-24 http://creativecommons.org/licenses/by/4.0/ http://doi.wiley.com/10.1002/tdm_license_1.1 10.1049/blc2.70037 https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/blc2.70037 https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/blc2.70037 https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/blc2.70037 https://ietresearch.onlinelibrary.wiley.com/doi/full-xml/10.1049/blc2.70037 10.1145/3653297 A Security and Privacy Compliant Data Sharing Solution for Healthcare Data Ecosystems Nowrozy R. 2024 A. A.SRandL.Samuel Legal Regulations of Electronic Health Records: A Comparative Perspective(Springer 2021). 10.1007/s11277‐021‐09374‐3 10.1002/9781394303564 10.1109/ACCESS.2019.2950872 Context‐Aware Attribute‐Based Techniques for Data Security and Access Control in Mobile Cloud Environment Li F. 2015 10.1109/ACCESS.2020.2970576 10.3390/app142311078 10.26599/TST.2023.9010080 International Journal of System Assurance Engineering and Management Kokila M. S. 1 15 7 2024 Securing Cloud‐Based Medical Data: An Optimal Dual Kernal Support Vector Approach for Enhanced EHR Management International Journal of Health Sciences Bateja R. 4940 6 2022 10.53730/ijhs.v6nS8.13322 Integration of EHR and PHR Leveraging Cloud Services for Approving Treatments 10.1109/TCE.2020.3043683 10.1007/s42979‐022‐01142‐9 10.1007/s42979‐022‐01238‐2 10.1109/ICOSEC51865.2021.9591956 S. J.GabrielandP.Sengottuvelan “An Enhanced Blockchain Technology With AES Encryption Security System for Healthcare System ” in2021 2nd International Conference on Smart Electronics and Communication (ICOSEC)(IEEE 2021) 400–405 https://doi.org/10.1109/ICOSEC51865.2021.9591956. 10.1109/IWCMC48107.2020.9148357 M.Al BaqariandE.Barka “Biometric‐Based Blockchain EHR System (BBEHR) ” in2020 International Wireless Communications and Mobile Computing (IWCMC)(IEEE 2020) 2228–2234. 10.1109/CCECE.2019.8861593 G.Srivastava J.Crichigno andS.Dhar “A Light and Secure Healthcare Blockchain for IoT Medical Devices ” in2019 IEEE Canadian Conference of Electrical and Computer Engineering (CCECE)(IEEE 2019) 1–5. 10.1109/ICOMET.2019.8673469 A.Murtaza S. J. H.Pirzada andL.Jianwei “A New Symmetric Key Encryption Algorithm With Higher Performance ” in2019 2nd International Conference on Computing Mathematics and Engineering Technologies (iCoMET)(IEEE 2019) 1–7 https://doi.org/10.1109/ICOMET.2019.8673469. 10.23919/ICACT.2019.8701983 S.Chakraborty S.Aich andH. C.Kim “A Secure Healthcare System Design Framework Using Blockchain Technology ” in2019 21st International Conference on Advanced Communication Technology (ICACT)(IEEE 2019) 260–264 https://doi.org/10.23919/ICACT.2019.8701983. 10.1109/ICCCI50826.2021.9402689 B.Vardhini S. N.Dass R.Sahana andR.Chinnaiyan “A Blockchain Based Electronic Medical Health Records Framework Using Smart Contracts ” in2021 International Conference on Computer Communication and Informatics (ICCCI)(IEEE 2021) 1–4. 10.1109/ICSIoT55070.2021.00019 G.Simpson L.Nana andQ. A.Kester “A Centralized Data Validation System Model for Healthcare Systems Based on Blockchain ” in2021 International Conference on Cyber Security and Internet of Things (ICSIoT)(IEEE 2021) 55–58 https://doi.org/10.1109/ICSIoT55070.2021.00019. 10.1109/ICSIMA50015.2021.9526301 A.Haddad M. H.Habaebi M. R.Islam andS. A.Zabidi “Blockchain for Healthcare Medical Records Management System With Sharing Control ” in2021 IEEE 7th International Conference on Smart Instrumentation Measurement and Applications (ICSIMA)(IEEE 2021) 30–34 https://doi.org/10.1109/ICSIMA50015.2021.9526301. 10.1109/MCE.2016.2556879 10.1002/spy2.32 10.1109/DSC49826.2021.9346259 T. L.ZhuandT. H.Chen “A Patient‐Centric Key Management Protocol for Healthcare Information System Based on Blockchain ” in2021 IEEE Conference on Dependable and Secure Computing (DSC)(IEEE 2021) 1–5. 10.1109/ICAIS50930.2021.9396029 V.BhattandS.Chakraborty “Real‐Time Healthcare Monitoring Using Smart Systems: A Step Towards Healthcare Service Orchestration Smart Systems for Futuristic Healthcare ” in2021 International Conference on Artificial Intelligence and Smart Systems (ICAIS)(IEEE 2021) 772–777 https://doi.org/10.1109/ICAIS50930.2021.9396029. 10.1145/3376915 10.3390/s20226420 10.1109/ISVLSI49217.2020.00-17 A. M.Joshi P.Jain andS. P.Mohanty “Secure‐iGLU: A Secure Device for Noninvasive Glucose Measurement and Automatic Insulin Delivery in IoMT Framework ” in2020 IEEE Computer Society Annual Symposium on VLSI (ISVLSI)(IEEE 2020) 440–445 https://doi.org/10.1109/ISVLSI49217.2020.00‐17. 10.1109/JIOT.2020.3045653 10.1093/eurheartj/ehz056 10.1109/CSCI51800.2020.00138 M. J. J.Gul A.Paul S.Rho andM.Kim “Blockchain Based Healthcare System With Artificial Intelligence ” in2020 International Conference on Computational Science and Computational Intelligence (CSCI)(IEEE 2020) 740–741 https://doi.org/10.1109/CSCI51800.2020.00138. 10.1145/3605098.3635970 I.Abellán Álvarez V.Gramlich andJ.Sedlmeir “Unsealing the Secrets of Blockchain Consensus: A Systematic Comparison of the Formal Security of Proof‐of‐Work and Proof‐of‐Stake ” inProceedings of the 39th ACM/SIGAPP Symposium on Applied Computing(ACM 2024) 278–287 https://doi.org/10.1145/3605098.3635970. Blockchain Quick Start Guide: A Beginner's Guide to Developing Enterprise‐Grade Decentralized Applications Wu X. B. 2018 M.Alruwaill S.Mohanty andE.Kougianos “blockEHR: Blockchain Based Large Scale EHR Data Sharing With Enhanced Security and Privacy ” preprint arXiv May 16 2025 https://arxiv.org/abs/2505.12610. 10.3390/math10152769 Blockchain: Research and Applications Baniata H. 100194 5 3 2024 Partial Pre‐Image Attack on Proof‐of‐Work Based Blockchains