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TikTok ran a deepfake ad of an AI MrBeast hawking iPhones for $2 โ and it's the 'tip of the iceberg'
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
You already can sign content with GPG for example.
A signature that isn't tied back to a single human being with a name and a face and an address that you can send a court summons to isnt worth the flash memory it's printed on.
The only difference is having a database of name to public key. The rest would end up even easier to track than crypto trades.