The core state compression is based on SPL account compression, and Bubblegum builds NFT management on top of it, such as mint, burn, transfer, and decompress operations. The Decompress operation allows the cancellation of cNFTs and directly mints equivalent standard NFTs.

The cNFTs based on this implementation can save a significant amount of account rent costs.

However, considering TON's sharding design, each order is stored in a separate order contract, and signers interact with this contract to authorize the order. The main contract is responsible only for validation and final execution. This allows for parallel execution.

The modular design enables developers to implement their own set of guards to achieve specific functionality. Overall, it is quite well-designed."

It is built on top of Metaplex and the SPL Token program. It allows developers to create a Candy Machine, set the information of the NFTs to be minted, and configure guards to add minting conditions.

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This implementation is quite intricate but also complex, making the maintenance cost significantly higher compared to ERC721.