Unlinkable Revocation Lists for Qualified Electronic Attestations: A Blockchain-Based Framework
Emil Bureacă, Răzvan-Andrei Leancă, Ionuț Ciobanu, Andrei Brînzea, Iulian Aciobăniţei · Electronics · 2025
The use of Verifiable Credentials under the new eIDAS Regulation introduces privacy concerns, particularly during revocation status checks. This paper proposes a privacy-preserving revocation mechanism tailored to the European Digital Identity Wallet and its Architecture and Reference Framework. Our method publishes a daily randomized revocation list as a cascaded Bloom filter, enhancing unlinkability by randomizing revocation indexes derived from ARF guidelines. The implementation extends open-source components developed by the European Committee. This work demonstrates a practical, privacy-centric approach to revocation in digital identity systems, supporting the advancement of privacy-preserving technologies.