Decentralized Identity (DID) systems aim to provide users with self-sovereign control over their credentials. However, verifying identities on public blockchains often risks leaking sensitive attributes and transaction histories, whereas relying on heavy generic cryptographic protocols leads to prohibitive on-chain costs. In this paper, we propose \textbf{CUBE} (Credential Unlinkability using Blinded Elements), a verifiable credential framework that integrates partially blind BBS signatures with Non-Interactive Zero-Knowledge (NIZK) proofs. By shifting complex identity validation off-chain while blinding the core identity-binding elements, the scheme ensures on-chain unlinkability without losing attribute auditability. To prevent Sybil attacks and credential transfer, we integrate a deterministic nullifier tied to Soulbound Tokens (SBTs). We formalize the scheme's system model and establish its security regarding existential unforgeability, signer-blindness, and zero-knowledge. Performance results show that this construction maintains minimal on-chain gas consumption, offering a practical deployment path for privacy-preserving verifiable credentials in Web3 environments.
BibTeX
@misc{cryptoeprint:2026/920,
author = {Guohao Lai},
title = {{CUBE}: Partially Blind {BBS} Signatures for Unlinkable Decentralized Identity},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/920},
year = {2026},
url = {https://eprint.iacr.org/2026/920}
}
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