> Personally, I don't think that is much of a problem, as you should be able to come up with a "superlean" version of your theorem prover where correctness is e

> Personally, I don't think that is much of a problem, as you should be able to come up with a "superlean" version of your theorem prover where correctness is easier to see, and then let the original prover export a proof that the superlean prover can check. I think this is sort of how lean itself already works. It has a minimal trusted kernel that everything is forced through. Only the kernel has to be verified.