The Kolmogorov–Obidi Lineage (KOL) historical and structural summary in Subsection 19.7 traces the intellectual genealogy from Kolmogorov's foundational axioms through Shannon, Bekenstein, Hawking, Jacobson, Verlinde, Padmanabhan, and Bianconi to the Obidi Action, establishing the Theory of Entropicity as the natural culmination of a century-long convergence between probability, information, and gravitation. Subsection 19.8 presents the rigorous derivation of the Obidi Curvature Invariant (OCI), proved by seven independent methods: the geodesic maximum on the Binary Entropic Manifold, the regularized relative entropy, the Landauer–Obidi derivation via the Entropic Description Theorem, the Holevo bound, quantum hypothesis testing via the Chernoff–Stein exponent, the channel capacity of the fundamental binary entropic channel, and the direct derivation from the Minimum Difference Principle (the open methodology). These seven derivations establish that OCI = ln 2 is a geometric constant.