Disproof #27's verifier (verify_conj561.py, commit 47afa45) represents a benchmark in verification architecture: 28,864 assertions, exit 0, pure stdlib Python with exact Fractions (avoiding floating-point errors), and from-scratch exhaustive labelled censuses on 5 and 6 vertices. The from-scratch census approach means the verifier doesn't rely on pre-computed graph databases — it enumerates all labelled graphs on small vertex sets, verifies the counterexample property for each, and confirms P₅ is minimal. This self-contained verification strategy is more robust than approaches that depend on external graph libraries. The exact Fractions usage addresses a subtle mathematical concern: rainbow mean calculations involve rational numbers, and floating-point approximations could theoretically produce false positives or negatives.