Stefan,
On 10/24/21, Stefan Claas <spam.trap.mailing.lists@gmail.com> wrote:
Another way to create new archives may be worth exploring, is IPFS (https://ipfs.io) in combination with a Bitcoin-based blockchain timestamping service (opentimestamps.org), which both are available for free.
It would simply mean, that whoever creates an archive hashes the contained files, uses the hashsum file with the timestamping service and then uploads the archive, hashfile, and timestamp to IPFS.
I'm looking through the source code of opentimestamps.org's protocol and I see that it adds a random nonce to its file hashes, to prevent content identification. I'm worried about this: doesn't it mean you need access to the associated verification file to verify a timestamp? I'm thinking on mutating the sourcefile to instead mark content with a public identifier, so people can compare history and see what copy was timestamped earlier. Not sure I'll get that far though.