Thank you, Kaj. Those references are what I was looking for.

It looks like there might be a somewhat new idea here. Previous suggestions, as you mention, restrict output to a single bit; or require review by human experts. Using multiple AGI oracles to check each other is a good one, though I'd worry about acausal coordination between by the AGIs, and I don't see that the safety is provable beyond checking that answers match.

This new variant gives the benefit of provable restrictions and the relative ease of implementing a narrow-AI proof system to check it. It's certainly not the full solution to the FAI problem, but it's a good addition to our lineup of partial or short-term solutions in the area of AI Boxing and Oracle AI.

I'll get this feedback to the originator of this idea and see what can be made of it.