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The White House wants to 'cryptographically verify' videos of Joe Biden so viewers don't mistake them for AI deepfakes
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
The only thing that comes to mind is something that forces interactivity outside the browser display area; out of the reach of Javascript and CSS. Something that would work for both mobile and desktop would be a toolbar icon that is a target for drag-and-drop. Drag the movie or image to the "verify this" target, and you get a dialogue or notification outside the display area. As a bonus, it can double for verifying TLS on hyperlinks while we're at it.
Edit: a toolbar icon that's draggable to the image/movie/link should also work the same. Probably easier for mobile users too.
If you set the download manager icon in the browser as permanently visible, then dragging it there could trigger the verification to also run if the metadata is detected, and to then also show whichever metadata it could verify.
That's a tad obscure, but makes it much easier to code up a prototype. I like it.