[pkage]

Weren't a lot of NFTs sold simply JSON blobs of metadata pointing at a web resource from some company? I remember seeing Cloudinary in some of the Beeple NFTs. I think some are pinned to IPFS now, but still that doesn't protect the NFT from link rot.

[ishjoh]

You are correct. IPFS attempts to address this issue by giving the asset a hash, so if no computer/server connected to the IPFS network has the asset, and you the owner have it, you could re-upload it to an IPFS server or join the network using your computer and the link will work again.

[miracle2k]

All you need is for the ledger to contain a hash of the file, and one of the people interesting in ownership of the NFT to keep a copy of the file around.