UniChain Hook

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.

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

1. 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

1. 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

1. Token Handling:

• Implemented a token locking mechanism for cross-chain transfers
• Used ERC20 and OFT standard for token interactions

1. Testing and Development:

• Used Foundry for smart contract testing and deployment
• Implemented comprehensive test cases covering various scenarios

1. 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
2. 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