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SGR 0418+5729 is a "Rosetta Stone" for deciphering the energy source of SoftGamma Ray Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs). We show a modelbased on canonical physics and astrophysics for SGRs and AXPs powered bymassive highly magnetized rotating white dwarfs (WDs), in total analogy withpulsars powered by rotating neutron stars (NSs). We predict for SGR 0418+5729 alower limit for its spin-down rate, $\dot{P} \geq L_X P^3/(4\pi^2 I)=1.18\times10^{-16}$ where $I$ is the moment of inertia of the WD. We show for SGRs andAXPs that, the occurrence of the glitch and the gain of rotational energy, isdue to the release of gravitational energy associated to the contraction anddecrease of the moment of inertia of the WDs. The steady emission and theoutburst following the glitch are explained by the loss of rotational energy ofthe Wds, in view of the much larger moment of inertia of the WDs, as comparedto the one of NSs and/or quark stars. There is no need here to invoke theunorthodox concept of magnetic energy release due to decay of overcriticalmagnetic fields, as assumed in the magnetar model. A new astrophysical scenariofor the SGRs and AXPs associated to Supernova remnants is presented. Theobservational campaigns of the X-ray Japanese satellite Suzaku on AE Aquariiand the corresponding theoretical works by Japanese groups and recent resultsof the Hubble Space Telescope, give crucial information for our theoreticalmodel. Follow-on missions of Hubble Telescope and VLT are highly recommended togive further observational evidence of this most fundamental issue ofrelativistic astrophysics: the identification of the true SGRs/AXPs energysource.

SGRs and AXPs as rotation powered massive white dwarfs