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Yeah this is the thing. You can’t prove ownership if you copy paste a jpeg or a url. You prove ownership with the blockchain.

• neilalexander 5y ago
  The blockchain tells you that you "own" whatever was at the URL at the point of time that it was written onto the chain. There is no continuing or on-going guarantee that the content at the URL won't change after that. If there is no content hash in the receipt and the original URL is now defunct, how do you prove authenticity?
  • programmarchy 5y ago
    One way would be to store a hash of the content at that URL with the NFT, but there's actually a better way. IPFS supports the concept of immutability [1], so you could just use an IPFS URL with a content identifier. It also allows for revisions linked to the original content identifier. [1] https://docs.ipfs.io/concepts/immutability/ https://docs.ipfs.io/concepts/immutability/
    • neilalexander 5y ago
      While this coincidentally works for IPFS CIDs, it's not clear why hashes wouldn't be first-class fields in the NFT itself.
    • jordemort 5y ago
      Is it correct that things can disappear from IPFS, if nobody is continuing to bother to pin the content? It seems like you could get an immutable URL this way, but that there's still no guarantee that the URL will remain accessible.
      • neilalexander 5y ago
        Yes, that is correct. The IPFS nodes with the relevant content may go offline, people who are pinning the content may just decide to not pin it anymore for whatever reason and then eventually the content would just disappear from people's caches.