We propose the Wavefront Ontology, a formal framework for temporal presentism in which physical reality exists exclusively at the present moment and time is the process of causal determination rather than a geometric dimension. The paper introduces five principal contributions: the Sandwich Principle (a theorem of forward causal inescapability), a burden of proof inversion establishing that the block universe bears the evidentiary burden for its extraordinary ontological claims, the 4+1D shadow interpretation of relativistic spacetime, a rigorous information-theoretic arrow of time, and a Born rule derivation from the determination process via Gleason's theorem. The framework connects to causal set theory and identifies experimental predictions including gravitational decoherence and quantum Zeno granularity.
Michael Davidson (Wed,) studied this question.