"Just analyze their on-chain history" sounds simple until you try to do it. Raw blockchain data is noisy, cross-chain identities are fragmented, and naive scoring approaches are trivially gameable. Here's how we built a scoring system that's actually useful.
When we set out to build a reputation layer for DeFi, we hit a fundamental tension: protocols need to verify creditworthiness, but users shouldn't have to broadcast their exact scores to the world. Zero-knowledge proofs solve this elegantly.
This post walks through how CrowdProof uses Groth16 SNARKs to enable private reputation verification — the tradeoffs we considered, the circuit design, and the performance characteristics.