Here's another similar project: https://writetrack.dev/

There's plenty of microbehavioral analysis we can do that is initially effective but will get bypassed (with GANs being the purest way, or something more domain-specific).

You could imagine a livestream that's permanently published somewhere. But the verification of the livestream takes longer than reading the piece itself (and is itself vulnerable to faking).

Personally I think it comes back to something like writing under your real name - staking your reputation - as the most trustworthy indicator. At least people in your circles can trust you.