ZK-PoH is a privacy-preserving biometric authentication system developed during the Midwest Blockathon. Over the course of 20 hours, our team built a cutting-edge solution to verify human identity while safeguarding user privacy. Our system issues time-bound Proof-of-Humanness (PoH) credentials to ensure continuous re-verification and security, making it a powerful tool in cryptography, blockchain, and digital identity management.

ZK-PoH leverages state-of-the-art technologies to create a tamper-resistant and privacy-preserving biometric authentication system. Our solution:

• Verifies Human Identity: Uses biometric authentication to prove that a digital entity represents a human being and not a bot.
• Preserves Privacy: Employs zero-knowledge proofs and SHA-256 hashing to authenticate users without revealing sensitive personal data.
• Ensures Security: Implements time-bound credentials that expire after a set duration, necessitating continuous re-verification.
• Efficient Biometric Management: Utilizes Hierarchical Bloom Filters for effective storage and management of biometric data.
• Blockchain Integration: Stores verification credentials on a transparent and immutable blockchain.

• Rust: Core logic and backend services.
• ark: Rust package used for generating ZK-SNARK proofs.

• Solidity: Development of smart contracts.
• Hardhat: Local blockchain development and testing framework.

• IPFS: Decentralized file storage.
• Pinata: Pinning service to maintain persistent file availability.

• React: Two separate frontends for PoH credential generation and mock voting.
• Chakra UI: Component library for streamlined and accessible UI development.