2026
Special Issue: Selected Proceedings of the 1st International Conference on Artificial Intelligence for Sustainability in the Developing World (AISDW2025)

Special Issue: Selected Proceedings of the 1st International Conference on Artificial Intelligence for Sustainability in the Developing World

Enabling Privacy-Preserving External Sharing of Electronic Medical Records Through a Tripartite Hybrid Blockchain Architecture

Published 2026-04-19

  • Mohammed Baker Yousif
    • ,
  • Omar Akram Khaleel Alsaffar
    • ,
  • Siddeeq Y. Ameen

Mohammed Baker Yousif


Omar Akram Khaleel Alsaffar
Computer Centre, University of Mosul, Mosul, Iraq

Siddeeq Y. Ameen
Department of Cybersecurity Engineering, Technical College of Engineering, Duhok Polytechnic University, Duhok, Iraq

Abstract

 

Patient-centric privacy, rapid interoperability, and verifiable auditability remain open problems in smart-healthcare data exchange. We present a tripartite hybrid blockchain framework that splits electronic medical records (EMRs) across three permissioned ledgers-Patient Chain, Provider Chain, and Social Chain-to decouple clinical processing from privacy-preserving external sharing. A crosschain Boneh-Lynn-Shacham aggregate-signature scheme fuses dual-chain approvals into a single 32byte proof, reducing signature storage by  and enabling constant-time verification. Zeroknowledge redaction releases only Tier-2 statistical summaries through the Social Chain, embedding GDPR/HIPAA principles of data minimization, purpose limitation, and complete auditability into the protocol rather than post-hoc governance. Security reductions to the Computational Diffie-Hellman problem and gambler's-ruin analysis show that, at  adversarial hash power, safe external finality requires 118 confirmations, which is  fewer than dual- or single-chain baselines. A three-chain prototype on private Ethereum sustains < 6 s mean latency at , while ZK processing averages 288.3 ms per request. The framework therefore delivers stronger security, lower cost, and regulatorready compliance, offering a practical blueprint for privacy-preserving EMR sharing in nextgeneration healthcare networks.

Keywords

blockchain, electronic medical records, cross-chain signatures, BLS aggregation

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