The objective of the Bitera project is to transfer all valuable ERC721s to the BTC network. To achieve this goal, the project will issue all valuable ERC721 series on the market, but some unexpected issues may arise during the migration to the BTC world, requiring each builder to re-collect and restore these NFTs. Users holding ETH blue-chip NFTs can participate in casting two pieces of the 4th-level fragments of their NFTs. After casting the 4th-level fragments, users can exchange rights or sell by collecting other fragments. Each new NFT can be cast with up to 2 4th-level fragments. The remaining fragments will enter the public freemint. (To prove, you need to send 0 ETH from a wallet holding the blue-chip NFTs to your own address). The Bitera project will also issue its own Bitera NFT, which is a 9th-level fragment. In the future, users can exchange with Bitera by collecting fragments and obtain a complete ERC721. The Bitera NFT will circulate on the Ethereum network, but it needs to be exchanged with a certain number of 4th-level fragments and 9th-level fragments by paying extra. After collecting the 4th-level fragments, users can pay the collected 4th-level fragments to the official and pay 2 more 4th-level fragments to cast 2 4th-level fragments of 5 new NFTs. Each new NFT can be cast with up to 2 4th-level fragments, the rest will enter the public freemint. After collecting the 9th-level fragments, users need to pay the collected 9th-level fragments to the official and pay 2 more 9th-level fragments to cast 3 4th-level fragments of 5 new NFTs. Each new NFT can be cast with up to 3 4th-level fragments, the rest will enter the public freemint. After collecting the 4th-level fragments and 9th-level fragments, they can also pay 2 corresponding fragments by paying extra. Look for Bitera officials to exchange ETH or other ERC721s on L2. (Waiting for future releases).