I actually no joke had the idea of making this in Rust. Basically store snapshots of the history alongside an eventlog (binary file containing compressed chronological input events).

But the problem with this is that someone could write an agent to mimic a human. And if there is a financial incentive to prove that you're not AI, which there always will be, it is inevitable.

I've considered learning to handwrite to write my first drafts like that. But then I could use an AI to generate realistic looking scans of handwriting.

I guess I could physically mail the originals to a third party verifier. That's what it may come down to for creatives.