Elastic Spacetime Theory (EST) models spacetime as a physical elastic medium whose voidstructure contributes a dynamical negative pressure at cosmological scales. In this work weidentify two sharp, falsifiable observational signatures that arise generically in EST cosmologyand are absent in ΛCDM: (i) a coherent void lattice with a characteristic scale of 110±5 Mpc,and (ii) a repulsive weak lensing signal inside deep cosmic voids with convergence κ ' −0.03.We further argue that the large-angle CMB anomalies commonly referred to as the “Axis ofEvil” may represent a residual imprint of an early-time two-dimensional elastic ordering transi-tioning into three-dimensional expansion. These predictions are directly testable with existingand forthcoming Euclid and LSST data, providing a near-term opportunity to confirm or falsifythe elastic spacetime paradigm. Author website: https://est-framework.org

Version 1.1 — Clarified derivations and presentation This update refines the covariant derivation in Appendix A, expands the Israel junction condition analysis for the repulsive lensing signature, improves figure formatting and captions, and adds a concluding section. All core predictions (void lattice scale 110 ± 5 Mpc, convergence κ ≃ −0.03) remain unchanged.