X404 Protocol
X404 is a brand-new NFT protocol based on the XRGB interoperability protocol and the ERC404 protocol. For the first time, it converts ERC721 and ERC1155 assets into multi-chain ERC404 assets, significantly enhancing the liquidity and transactional properties of NFTs. The design diagram is as follows:

The main design points are:
- Anyone can add whitelist NFT assets, provide liquidity for NFTs, and receive a portion of the transaction fees subsequently. 
- Each different type of NFT is an X404 contract, which is an extended ERC404 contract. 
- After depositing NFTs, users will receive X404 tokens and can redeem their assets with priority within a specified period. After the redemption period expires, others can exchange for the assets by collecting a certain number of ERC404 tokens, which requires an extra transaction fee. 
- X404 tokens can be transferred across multiple chains through the XRGB protocol, making them tradable on various DEXs. 
- The XRGB token is a governance token. Holders can govern protocol parameters, such as liquidity rewards, redemption time, fees, etc. 
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