Koi.bio is a cross chain NFT collectibles based on the BSC(Binance Smart Chain) and Ethereum ERC721-Polkadot. It has integrated the NFT card game which has the functions of collection, cultivation, trading, auction, game, and others. By adopting the cross-chain mechanism, Koi.bio builds the cross chain NFT-KOI collectibles, such as Polkadot, BSC and ETH.