[Someone]

I don’t see how that would prevent deep-fakes from being made for past events.

Cryptographic time-stamping can show that a set of images existed at some time, but not that no other images existed at that time.

So, unless you manage to time-stamp most images in the world, there will be a huge set of images without provenance.

The creator of fake content will just add to that set.

[axelsvensson]

That's why I'd like to see a web archive doing this, so that most publicly accessible content gets a timestamp. That way, it would be suspicious to present an image of an event in the far past that should've been published long ago.