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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.
That's fine?
Signatures aren't meant to prove authenticity. They're proving the source which you can use to weigh the authenticity.
I think the confusion comes from the fact that cryptographic signatures are mostly used in situations where proving the source is equivalent to proving authenticity. Proving a text message is from me proves the authenticity as there's no such thing as doctoring my own text message. There's more nuance when you're using signatures to prove a source which may or may not be providing trustworthy data. But there is value in at least knowing who provided the data.