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    Cross-chain KYC

    Web app and smart contract bundle for cross-chain KYC DAO verification

    Superhack 2023View on ETHGlobal ↗Source code ↗Demo ↗

    Demo

    About

    ## Chelenge: A lot of projects need KYC for business logic. Such as games, grant programs, even DeFi in some regions. One of popular solution for this is KYC DAO. However, this verification is currently only available on Polygon and Celo and projects on other networks have to use expensive proxies to check for KYC. ## Solution: Cross-chain KYC is a smart contract bundle that allows the user to transfer the proof of KYC to Base and Optimism. A client contract implementing the KYC DAO interface and can be easy used by any project. The user can themselves transfer KYC proof to the desired chain after which any dApp can verify KYC on-chain in one cheap call. ## Result: Web app is live for Base and Optimism support: [demo](https://cross-chain-kyc.h4n.app) . [github](https://github.com/pvolnov/crosschain-kyc) . Smart contracts clients ready and deployed to Base and Optimism mainnet **KYC Proxy** - Polygon (testnet): - adress `0xeA155E0145ff4b240b65601aC55E3d7Ed8878c4E` **KYC Client** - Optimism (testnet): - adress `0xc3765f58a10c5636de7628ad434a08f34f2d0fdc` - chain id: 10132 - Base (testnet): - adress `0xd8425b5d9d5f0a4dd1db58bed2da8070bdc931fa` - chain id: 10160 ## Example use case 1. Game developer on Base need to check KYC before sending a rare NFT. 2. They redirect the user to https://cross-chain-kyc.h4n.app?base before confirming the transaction. The user connects their wallet and creates a KYC proof on Base with LayerZero 3. Developer add to game contract quick and cheap KYC check via proxy-contract on Base chain ## Security: The contact code and KYC Proxy addresses are not changeable. Verification of KYC client is possible only after verification on the original network. This allows to use the contract made during the hackathon in production in any projects.

    How it's made

    ## KYC Proxy: Smart contract of KYC Proxy and KYC CLient are made on solidity and published on Base and Optimism. Asynchronous messages via LayerZero are used for cross-chain verification. Technical documentation for developers is created on gitbook. ## Web app: Web app is built on React JS with Metamask SDK. Covalent API is used to check for KYC status and pre check account balance.