I'm not sure that raising the bar for how expensive it is to fake a video is the right step to take. That'll just preserve, for a little while longer, the false sense of security that comes from seeing a video and assuming it's real. Meanwhile, the well funded bad actors will remain uninhibited (and aren't they the scariest ones?)

It looks like fun research, but I think we'd get a lot better bang for our buck persuring ways to attach annotations to a video like:

> I was there and I saw this happen

...such that you can find transitive trust paths from yourself to a verifier who annotated the video. That'll require a bit of trust hygiene that the common folk aren't prepared for, but I dont think there's any getting around preparing them for it.