Self-Sovereign digital Identity in blockchain based systems for E-health cards management

Protecting user rights and enabling cross-border interoperability require the existence of private and secure management of personal identity data in digital environments. To address this need in the context of electronic health cards for digital identification and healthcare services, this paper proposes a novel architecture that integrates self-sovereign identity (SSI), verifiable credentials (VC), and zero- knowledge proofs (ZKP). With SSI, users maintain full control over their data, storing and sharing identity credentials through digital wallets using decentralized identifiers (DIDs). VC enables trusted organizations to issue authenticated, tamper-proof digital certificates, while ZKPs allow individuals to prove identity-related claims without disclosing unnecessary personal details. The combination of these technologies enables a framework that ensures a tradeoff between user privacy and security processes. The findings of the tests achieved indicate that our framework, compared to conventional models, optimizes the interoperability and privacy of e-health card systems. Additionally, the suggested solution supports recent data protection regulations and demonstrates strong potential for global adoption.