it will be implemented by chips-on-camera, that will tie you to a picture. it will be pushed forward by law enforcement ("think of the children!") and it will be great for profits. not so much for privacy.
Yet it doesn't actually solve the problem. Whatever technical implementation you can think of, can somehow be misused so you have AI pictures labeled as "Genuinely not AI".
If you do come up with a 100% fool-proof implementation of this, you'll be able to get a lot of money for it, so do give it a try! Many have tried before you, yet it always turns out to be short of impossible. But who knows, maybe there is a way...
>it will be implemented by chips-on-camera, that will tie you to a picture.
You can mitigate this by having a pool of devices (eg. 1000) share keys. AFAIK TPM chips and U2F/FIDO keys do this to provide some anonymity while limiting the blast radius if a key does get leaked.
If you do come up with a 100% fool-proof implementation of this, you'll be able to get a lot of money for it, so do give it a try! Many have tried before you, yet it always turns out to be short of impossible. But who knows, maybe there is a way...