5 ms·

There's also https://opentimestamps.org/ https://opentimestamps.org/ for timestamping into the bitcoin blockchain using a 'calendar aggregation' concept. Client

There's also https://opentimestamps.org/ https://opentimestamps.org/ for timestamping into the bitcoin blockchain using a 'calendar aggregation' concept. Clients get back a merkle tree of hashes that can be used to show inclusion in a published hash on the blockchain. I've been using opentimestamps/ots for a few years now. It can be used to show a specific version of a file existed as early as the proof date. Unfortunately the only other value seems to be showing that if you had doctored a file then that happened at least as early as the timestamp and not later.

DreamFlasher 4y ago
What can you achieve with such a proof?
- moralestapia 4y ago
  Proof that something was there at some time in the past + proof that the contents haven't been tampered with.
  - kanzure 4y ago
    It's only proof that the contents (should it match the original hash) haven't been tampered with after the timestamping.
    - kanzure 4y ago
      backlink to a related recent discussion: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-June/thread.html#20564 https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022...