UniChain Hook
This project enables sybil free cross-chain atomic swaps using Uniswap V4s before and after swap hooks and layer zero's OFT contracts.
About
This project implements a custom Uniswap v4 hook that integrates cross-chain token swaps using LayerZero and incorporates Worldcoin ID verification. The main features and components are: 1: Uniswap v4 Integration: - Implements a custom hook (SwapHook) that interacts with Uniswap v4 pools. - Uses the BaseHook contract from Uniswap v4 periphery. -Implements beforeSwap and afterSwap functions to execute custom logic during swaps. 2: Worldcoin ID Verification: - Integrates with WorldIDVerifiedNFT to ensure users are verified before performing swaps. - Checks if the user has a World ID Verified NFT in the beforeSwap function. 3: Cross-Chain Functionality: - Utilizes LayerZero's OFT (Omnichain Fungible Token) standard for cross-chain token transfers. - Implements functions to initiate cross-chain transfers after successful swaps. 4: Token Locking Mechanism: -Locks tokens for cross-chain transfers using a mapping to track locked token amounts per user. 5: Event Emission: - Emits events for cross-chain transfers, token locking, and LayerZero operations. 6: Custom Logic: - Implements custom debit and credit functions to handle token transfers across chains. - Overrides LayerZero's _lzReceive function to handle incoming cross-chain messages. In summary, this project creates an advanced AMM (Automated Market Maker) system that combines Uniswap v4's flexibility, LayerZero's cross-chain capabilities, and Worldcoin's identity verification to enable secure, cross-chain token swaps with user verification. This integration aims to enhance liquidity, improve security, and provide a seamless cross-chain trading experience for users.
How it's made
1. Core Technology Stack: - Solidity for smart contract development - Uniswap v4 for the base AMM functionality - LayerZero for cross-chain interoperability - Worldcoin ID for identity verification - Dynamic Wallet for log in - Safe smart wallet for smart accounts - Blockscout 2. Smart Contract Architecture: - Implemented a custom Uniswap v4 hook (SwapHook) to integrate cross-chain functionality and identity verification - Used the BaseHook contract from Uniswap v4 periphery as a foundation - Implemented beforeSwap and afterSwap functions to handle custom logic 3: Cross-Chain Functionality: - Integrated LayerZero's OFT (Omnichain Fungible Token) standard - Implemented cross-chain message passing using LayerZero's Ultra Light Nodes (ULNs) - Used LayerZero's send function to initiate cross-chain transfers 4. Identity Verification: - Integrated Worldcoin's World ID protocol for proof of personhood - Implemented verification checks in the beforeSwap function - Used zero-knowledge proofs to maintain user privacy 5. Token Handling: - Implemented a token locking mechanism for cross-chain transfers - Used ERC20 and OFT standard for token interactions 6. Testing and Development: - Used Foundry for smart contract testing and deployment - Implemented comprehensive test cases covering various scenarios 7. Notable Implementation Details: Combined Worldcoin verification data and cross-chain transfer data in a single hookData parameter Implemented a custom CrossChainTransferData struct to handle transfer-specific information Used events to log important actions like CrossChainTransferInitiated 8. Challenges and Solutions: - Addressed the complexity of encoding and decoding hookData to include both Worldcoin and cross-chain information - Implemented careful error handling and logging to debug cross-chain interactions