Why blockchain? Any old public key signature scheme would do for that (and conversely, a blockchain doesn't solve the sockpuppet problem either).

“Git” again earning its name.

You can’t certify human unless there is some sort of ID check. Even then a human could willfully pass off any AI work as their own.

Why do you think Altman wanted to build world coin to have biometric capture

So he could sell the data? It’s almost certainly not because he cares so much about certifying human versus AI. Even then the biometric data is not going to be enough. Any human could still use the biometric data to pass AI work off as their own.

Indeed and the data is worth much much more if it is tied to a biometric.

And if you assume that in the future there will be crypto banks globally then you want to be that final authority layer between the real and the computer world

Yeah but my original comment was talking about being able to reliably mark something as AI generated or human generated. Crypto, encryption etc. whatever you throw at it it’s just not possible (other than media that can be watermarked at the generation source).