This work presents a theoretical framework in which all fundamental physical phenomena derive from a single discrete substrate—the chronon field—and a set of ten postulates governing its behavior. The chronon field consists of ordered sequences. Actualization events occur within these sequences, selecting pathways from a possibility space and irreversibly eliminating others. From the postulates, it derives: the capacity constraint governing the allocation of change between temporal and spatial channels; the maximum spatial propagation rate and the kinematic relations for frame comparison; the distinction between reversible and irreversible actualization with their different dependencies on velocity and history; the phase–action relation and the mass–actualization equivalence; and the energy–momentum relation. Computational analysis of phase-synchronized fundamental units reveals a U-shaped survival curve with two stability maxima—a low band and a high band—yielding a discrete mass spectrum when combined with the geometric constraint that only icosahedrally symmetric arrangements form stable composites. The electron mass calibrates the fundamental mass scale. The proton and pion masses then follow as predictions to within one percent. Gravity is derived as the deformation of the actualization kernel by accumulated actualization density, yielding the inverse-square force law and the equivalence of gravitational and inertial mass without assuming a geometric background. Quantum mechanics—including the Born rule, linear superposition, Hilbert space structure, unitary evolution, measurement, entanglement, and decoherence—emerges from the phase clock and the possibility space. The theory makes five falsifiable predictions: a two-band particle spectrum; the absence of fundamental sub-constituents within the proton; a divergence between reversible and irreversible actualization rates at high velocity; a correlation between galactic dark matter content and formation history; and maximum-density states with no singularities. Several open problems are honestly identified, including the formal closure of the superposition lemma and the unique derivation of the proton structure number. The framework is internally consistent, makes contact with established physical laws at every point examined, and offers testable departures from those laws. No prior knowledge of relativistic or quantum formalism is assumed; all results follow from the stated postulates.