I've been playing with a small browser-side prototype that tries to answer a boring but increasingly important question:

Where did this piece of web content come from?

Not “is this AI-generated?” I think that question is already getting messy. Detectors can be useful sometimes, but I would not build trust on top of them alone.

The simpler question is: When was this page first seen? Who saw it?

Did it change? Can we still replay what was captured?