ABSTRACT
Healthcare data continues to face challenges related to centralized storage vulnerabilities, unauthorized access, and a lack of transparency. Blockchain technology offers a decentralized and tamper-resistant solution; however, ensuring secure identity verification and privacy-preserving access control remains a key requirement in healthcare environments. This paper presents NBBZVF, a blockchain-driven identity verification framework that integrates Non-Fungible Tokens (NFTs) for data ownership and Zero-Knowledge Proofs (ZKPs) for confidential authentication. The proposed architecture utilizes Solidity-based smart contracts, wallet-based identity mechanisms, and IPFS for secure data storage and retrieval. Experimental results demonstrate enhanced protection against identity fraud, selective and controlled access to sensitive medical records, and efficient data integrity validation. This approach strengthens patient-centric security while supporting scalable and interoperable healthcare applications.
