Title: Dual-Layer Blockchain Architecture with Secure Homomorphic Indexing for Decentralized Medical Record Management
Author:
Balaiah Miska
Tata Teleservices Limited, Kolkata. India.
email: balaiah.miska@tatacommunications.com, balaiahmiska@gmail.com
Pages: 26-40
DOI: https://doi.org/10.55306/CJIESN.2025.010103
Abstract:

Successfully handling electronic health records (EHR) is a main challenge in contemporary healthcare, constricted by escalating cyber-attacks, constrained data exchange and patient - centred data management. Conventional centralized systems can be disrupted with data breaches, theft of information, and have single points of failure, which are not scalable for healthcare systems. In this paper, we propose the Dual-Layer Blockchain Architecture (DLBA) that combines a public blockchain (to record transparent access loggings) and private blockchain (to store sensitive metadata), which achieves both security and scalability. We propose a new secure homomorphic encryption hash mapping algorithm (HHMA) to support search and retrieval of the medical records while keeping the sensitive data hidden. Medical records are saved in the InterPlanetary File System(IPFS) so that the storage does not rely on any single key, it is distributed and the records will be unable to be tampered with and the access policy and the watching history are all immutable maintained by the blockchain the layers. The proposed framework ensures patient-controlled data sharing, efficient retrieval, and privacy preservation, making it a viable solution for interoperable and trustworthy medical record management. Experimental validation demonstrates reduced retrieval latency, enhanced query privacy, and improved scalability compared to conventional blockchain-only EHR systems.
Key Words: Decentralized Healthcare Systems, Dual-Layer Blockchain, Electronic Health Records (EHR), Homomorphic Hash Mapping Algorithm (HHMA), IPFS, Privacy-Preserving Retrieval, Public–Private Blockchain, Secure Homomorphic Indexing.
Citation: B. Miska., “Dual-Layer Blockchain Architecture with Secure Homomorphic Indexing for Decentralized Medical Record Management,” Ci-STEM Journal of Intelligent Engineering Systems and Networks, Vol. 1(1), pp. 26-40, 2025, doi: 10.55306/CJIESN.2025.010103