Tinfoil hat time. It's probably because they need to start creating AI videos to show he's 'competent and coherent' and they'll say their 'tests proves that it's a real video not a fake. And since the government said it's true, morons will believe it.
Honestly I'd say that's on the way for any video or photographic evidence.
You'd need a device private key to sign with, probably internet connectivity for a timestamp from a third party.
Could have lidar included as well so you can verify that it's not pointing at a video source of something fake.
Is there a cryptographically secure version of GPS too? Not sure if that's even possible, and it's the weekend so I'm done thinking.
Positioning using distance bounded challenge-response protocols with multiple beacons is possible, but none of the positioning satellite networks supports it. And you still can't prove the photo was taken at the location, only that somebody was there.
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