MUDRA: A Multi-dimensional Privacy Attainment Framework for Healthcare Blockchain Transactions

The integration of blockchain technology into consumer electronics is transforming healthcare by enhancing data security and streamlining operations in devices like wearable health monitors, smart medical devices, and electronic health records. However, this integration raises significant privacy concerns, especially regarding potential data leaks through automated processes like smart contracts. Traditional Private Information Retrieval (PIR) methods struggle with balancing data accessibility and patient confidentiality. This creates computational inefficiencies and interoperability challenges that hinder the implementation of standardized privacy measures in blockchain. We introduce the MUlti-Dimensional pRivacy Attainment (MUDRA) framework, a novel solution addressing critical privacy challenges in the storage and retrieval of patient and healthcare service provider (HSP) data. MUDRA leverages the innovative Dual Server Ring Private Information Retrieval (DS-RPIR) protocol to securely retrieve Personal Health Information (PHI) without publishing sensitive data to the blockchain, ensuring enhanced privacy and preventing unauthorized access. By integrating the Interplanetary File System (IPFS), MUDRA preserves data confidentiality and supports time-controlled revocation, allowing patients to set time-limited access to their medical records, automatically revoking access after the specified period. The framework introduces a new metric, Privacy Attainment (PA), to quantify transaction privacy and evaluate the private retrieval of sensitive data. When implemented on the Hyperledger Fabric network, MUDRA achieves 3.5% higher throughput (59 TPS), reduced time complexity $O(nlogn)$ , and 8 ms latency—2.25 ms less than existing solutions. These performance improvements, coupled with robust privacy features, position MUDRA as a pioneering solution for addressing privacy concerns in the rapidly evolving field of healthcare consumer electronics.