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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.
To that extent, we already have that.
I go to 'https://cnn.com', I have cryptographic verification that cnn attests to the videos served there. I go to youtube, and I have assurances that the uploader is authenticated as the name I see in the description.
If I see a repost of material claimed to be from a reliable source, I can go chase that down if I care (and I often do).