In the case that the metadata is stored off-chain, the initial input variables which create a hash on the initial chain, Ethereum for instance, are changed with different input variables that create an entirely different hash on the second chain, Solana for instance. With Burnt, the metadata related to NFT creations are always signed on-chain and are therefore verifiable even in the case that the NFT is transitioned to another chain. The low-fee costs associated with the Solana chain are also favorable to such signing as creators will not incur excessive costs to sign NFT metadata on-chain.