Cross Carbon: A Privacy-Preserving Platform for Sybil-Resistant Event Attendance Verification

This work proposes a fresh approach using blockchain technology and advanced cryptographic primitives’ privacy-preserving event attendance verification. Three basic problems in digital event management are addressed by our solution zkMeetups: 1) participant privacy preservation; 2) Sybil attack resistance; 3) distributed trust building. We get 128-bit security with O(log n) verification complexity by means of a novel mix of Groth16 zk-SNARKs, nullifier-based anti-collusion systems, and cross-chain verification architecture. Maintaining complete participant anonymity, experimental data show 92ms average proof generating time and 500+ verifications/sec through- put. By using Scroll zkRollup for batch verification, the system lowers gas costs by 68