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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.
Your right in that cryptographic verification only can prove someone signed the video. But that will mean nutters sharing "BBC videos", that don't have the BBC signature can basically be dismissed straight off. We are already in a soup of miss information, so sourcing being cryptographically provable is a step forward. If you trust those sources or not is another matter, but at least your know if it's the true source or not. If a source abuse trust it has, it loses trust.