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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,

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 4y ago
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.