We identify the quanta of spacetime in the One-Octonion Brane-Bulk Framework as spatial phonons: collective oscillations of the Fano lattice that emerge as the dual description of brane vibrations. The dispersion relation ω(k) = (2c/a)| sin(ka/2)| recovers the continuum ω ≈ck at long wavelengths (ka ≪1) and saturates at the Planck cutoff ωmax = 2c/a when ka → π. The saturation is the framework's mechanism for the Generalised Uncertainty Principle (GUP) ∆x∆p ≥(¯h/2)(1 + β∆p2) with β = a2/¯h2 ∼1/m2 Pl. The framework predicts: (i) absence of trans-Planckian propagation modes; (ii) discrete modification of the gravitational- wave dispersion relation testable at LIGO/Virgo/KAGRA; (iii) ultra-high-energy cosmic ray dispersion modifications testable at Pierre Auger and IceCube; (iv) a definite β = a2/¯h2 value for GUP-modified atomic physics testable in molecular clocks. Five falsifiable predictions. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10.5281/zenodo.19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M.D., University of Minnesota. ORCID: 0000-0002-1143-941X.
Bharathi Jagadeesan (Fri,) studied this question.