ShadowRep: Building a Confidential Reputation Protocol with Zama's FHE on Ethereum

Description

ShadowRep is a privacy-preserving onchain reputation protocol built using Zama's Fully Homomorphic Encryption (fhEVM). Unlike traditional reputation systems where all scores are publicly visible, ShadowRep keeps attestations and scores encrypted at all times - even while computing on-chain. Key Features: - Encrypted attestations using euint64 (1-100 score range) - Homomorphic score accumulation with FHE.add() - Threshold proofs without revealing exact scores using FHE.ge() - Granular access control with FHE.allow() Use Cases: - Undercollateralized DeFi lending - Anonymous weighted DAO voting - Private professional credentials - Fair gaming matchmaking Tech Stack: - Zama fhEVM (Fully Homomorphic Encryption) - Solidity 0.8.27 - Hardhat - React + TypeScript - ethers.js v6 Links: - Live Demo: https://shadowrep.vercel.app - Verified Contract: https://sepolia.etherscan.io/address/0x41fa55ceFD625E50Fa1Ae08bAeA87aC5C8BE0aD7#code #Zamacreatorprogram #FHE #Ethereum #Privacy #Web3 #Blockchain #DeFi #Solidity #HomomorphicEncryption