The Society of Authors (UK) is helping launch this: an identifier for human-authored (i.e. non-AI) books: https://humanauthored.co.uk/
EDIT: aaaaaand they used AI-generated artwork 🤦🏻♂️
EDIT UPDATE: they ditched the AI-generated art. Good.

Home - Human Authored
In a world of generative AI, recognising human creativity is vital This is why we’re developing a Human Authored mark to enable all types of writers and literary translators to label their work as Human Authored. The scheme is set to launch on Tuesday, 10 March 2026 at 5pm GMT. Days Hours Minutes Seconds
