This is the final Volume V of the five-volume series The Origin of Complex Spacetime, defined as the global experimental verification layer. It systematically collects allobservable theoretical predictions from the first four volumes, establishes three categories of verification schemes including particle accelerators, cosmic astronomical observations, and desktop topological simulations, and provides cutting-edge engineering implementation routes based on BCC lattice topological principles. Built upon the PanGu primordial equation in Volume I, Cl8,C algebra and BCC lattice topology with the Low-Energy Degradation Equivalence Theorem in Volume II, fermion spectra and flavor mixing matrices in Volume III, higher-order topological corrections, quantum gravity and cosmological models in Volume IV, four core tasks are accomplished: sorting out a graded list of theoretical predictions for the whole series, designing multi-scale experimental detection schemes, constructing a numerical simulation reproduction framework, and proposing prototype engineering solutions for topological superconductivity and topological particle detection. All theoretical modules marked △ and ?? from Volume III and Volume IV are uniformly verified, and full theoretical closure is achieved through experimental threshold measurementand simulation iteration. All measurable physical quantities such as total neutrino mass, CKM geometric angle, topological dark matter defects, CMB spectral index and low-energy traces of Planck scale are integrated, with quantified error ranges and detection signalto-noise ratio requirements provided. This text adheres to the series-wide terminology standard: the fundamental primordial geometry is defined as the non-Hermitian complex bilinear metric, while the low-energy limit classical framework is referred to as the real Hermitian metric system. Two computational pipelines are adopted: full high-energy primitive equations from Volume I and low-energy simplified equations from Volume II Part II, with all algebraic and lattice identities referenced to Volume II Part I. The three-tier completion marking standard of the whole series is implemented throughout, and all experimental schemes are attached with theoretical expected signals and background noise estimations. Keyword