The rise of NFTs and GameFi move us close to realizing the promise of the metaverse. Despite the enthusiastic adoption of these technologies, the current marketplace still lacks a fully-formed NFT market to connect and support a variety of NFTs across multiple chains. The importance of NFTs in the metaverse is beyond doubt, and the centralized NFT trading platform has caused increasing dissatisfaction among users. In the future, users need a more free and open NFT trading market. The high gas...