Weighted Threshold Anonymous Credentials With Redactable Fine-Grained Blind Signature for Auditable Lending System in Blockchains

This academic paper proposes WTAC (weighted threshold anonymous credentials with redactable fine-grained blind signature), a new privacy system designed for blockchain platforms that need to balance user anonymity with regulatory oversight. The system uses advanced cryptographic techniques (like functional encryption and secret-sharing) to let credential issuers verify certain information about users without seeing their actual data, while keeping the issuer's identity hidden from both users and verifiers. The researchers demonstrate how their system could work in a privacy-preserving lending platform on blockchains and claim their approach is both secure and efficient.