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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.
Ultimately, reputation based trust, combined with cryptographic keys is likely the best we can do. You (semi automatically) sign the photo, and upload it's stamp to a 3rd party. They can verify that they received the stamp from you, and at what time. That proves the image existed at that time, and that it's linked to your reputation. Anything more is just likely to leak, security wise.