NFTs essentially are blobs of data on the blokchain. As soon as that data references anything off chain you need off-chain methods to sync data with a blockchai

NFTs essentially are blobs of data on the blokchain. As soon as that data references anything off chain you need off-chain methods to sync data with a blockchain, at which point the blockchain becomes merely a datastore. > A digital ID, a in-game asset, a digital license All of which require off chain sync. For NFTs to have any meaning at all, the embedded data must be world readable. At which point that digital ID, in-game asset, license all are usable by anyone else. In order for that "ownership" to have any meaning at all it must be exclusive and therefore the service must check your identity one way or another, be it somehow checking that you actually own the private key corresponding to NFT, or using any other mutually agreed authentication method. If the service does not recognize the particular blockchain fork your NFT resides in your NFT is more than useless, because it does not prove absolutely anything to the service provider. Proving identity via blockchain is probably the most inefficient method known. NFTs can only make viable statements about on-chain assets. As far as I am aware, there are no other on-chain assets than cryptotokens, therefore all NFTs do are provide a level of indirection to cryptotokens.