Reputation Oracle
AI-powered on-chain reputation system for Web3 gaming using ZK proofs on Ronin blockchain
Demo
About
RoninTrustScore is a decentralized reputation oracle that brings trust and accountability to Web3 gaming communities. Users complete behavioral questionnaires analyzed by AI (GPT-4) to generate reputation scores (0-100) across four dimensions: trustworthiness, security, experience, and behavior. The system generates zero-knowledge proofs of these scores, allowing users to prove their reputation without revealing sensitive questionnaire data. Scores are published on-chain via Ronin Saigon testnet, creating an immutable, verifiable reputation history that game developers and DAOs can query to make informed decisions about user access, roles, and privileges. This solves a critical problem in Web3 gaming: how to identify trustworthy players without compromising privacy or relying on centralized authorities. By combining AI analysis with blockchain verification, we create a transparent yet privacy-preserving reputation layer for the gaming metaverse.
How it's made
Full-stack dApp built with React + Tailwind CSS frontend, Node.js/Express backend, and Python FastAPI AI microservice using OpenAI GPT-4o-mini. **Frontend:** Interactive questionnaire interface with wallet integration, real-time API calls displaying AI scores and proof generation status, and transaction monitoring. Built with React hooks for state management and Tailwind for responsive UI. **Backend:** REST API handling submissions, score storage, and ZK proof generation using ethers.js. Communicates with Python microservice for AI analysis, converting questionnaire JSON to natural language text for better GPT comprehension. **Smart Contracts:** Solidity Verifier and ReputationOracle contracts deployed on Ronin Saigon testnet. Verifier validates proofs and extracts public inputs; Oracle stores scores with msg.sender validation ensuring users control their own reputation. **Flow:** User completes questionnaire → Frontend sends to backend → AI analyzes → Backend generates ZK proof → Frontend prompts wallet signature → User publishes on-chain → Immutable reputation stored. **Key innovations:** Bridged AI with blockchain, implemented ABI encoding for Solidity compatibility, created seamless UX for complex cryptographic operations, and leveraged Ronin's low fees for accessible on-chain reputation. Demonstrates practical ZK proofs in gaming reputation systems.