[khyryk]

Any ideas on how the "only by" would work? I'm not seeing a way around pasting generated text and signing it as one's own work. Proof of work solutions would have to have a high cost for anyone to care, otherwise there would be bots "proving" the work of writing an essay by generating it in phases like a human would edit drafts.

[standardly]

This is the really first time I've thought about this, so uh... No, no ideas.

One's identity would need verified concurrent with creation of a text. I am not really satisfied with the idea of a specialized word processor or input device that does biometric validation, I'd rather have a specific, standardized protocol. I wonder if this is already deemed impossible, or if someone is working on the problem.