Gravitational lensing has revealed a universe filled with invisible mass.From the Bullet Cluster to JWST's deepest maps, the evidence for dark matteris overwhelming—yet its nature remains unknown. WIMP searches have come upempty, axion haloscopes report null results, and recent discoveries ofgalaxies apparently devoid of dark matter challenge the standard cold darkmatter paradigm. This paper presents the neutral chaoiton of the OuroborosLagrangian—a classical field theory with only three free parameters that isdynamically equivalent to its own canonical quantization—as a natural darkmatter candidate. We show that the massive J-field of the theory subsumesthe axion via the dual axion mechanism of Brennan (2024): the axion is thelongitudinal mode of the J-field. The neutral chaoiton mass is set by thesame parameters that fit the electron and the long-range nuclear force,requiring no new inputs. A preliminary freeze-out estimate gives a relicabundance Ω_c h² ≈ 0.1–0.2, consistent with the Planck value once theneutral-chaoiton ground-state mass is determined. The model survives allexisting axion experimental bounds (ADMX, CAST, beam-dump, stellar cooling)with only mild cosmological tension—a falsifiable prediction for future CMBand BBN data. We propose a layered nanostructure sensor network to detectthe galactic dark-matter wind through coherent J-field disturbances.