5 ms·

You can't prove a file existed before a certain date with IPFS like you can with Bitcoin.

• capableweb 7y ago
  Yes, if I understand IPFS correctly, you can. Since IPFS works as a content addressed system, if you embed the date, send the document to the judge (the hash which is based on the content), don't show it until a later point, you can prove the document is the same as you sent, even without revealing the content until later. IPFS doesn't seem to have anything about "version control" as onyb mentioned.
  • tingletech 7y ago
    what prevents me from pre-dating a document on IPFS?
  • bluesign 7y ago
    how you will embed the date?
    • jstanley 7y ago
      The IPFS hash is a hash of the content. Simply including the date as text would suffice.
      • lmm 7y ago
        What stops you from backdating a document when you write it?
        • jstanley 7y ago
          Nothing. Including the date doesn't do anything other than commit yourself to stating that date, the important part is the date at which you commit to the hash.
          • capableweb 7y ago
            I'm assuming to you add the document (with date) to IPFS without being connected to the network (no actual data gets shared, only hash), gets the hash and send it over to the person you need to prove the document's date to. They won't be able to get it (since content itself is offline) and once you want to prove it, you add it again or make it otherwise online. Then they can fetch the same hash and confirm they received the hash at the date.