We argue that quantum randomness is a logical necessity arising from the nature of intrinsically relational properties---properties lacking definite states outside specific contexts of causal interaction. This motivates Relational Actualism (RAQM), an ontological framework classifying physical properties as invariant, classical, or intrinsically relational. RAQM grounds wave function actualization in physical interaction rather than observer-relative facts. The actualization criterion is physically grounded and mathematically precise: an interaction constitutes an actualization event when it produces an irreversible increase in the quantum relative entropy of the system with respect to the vacuum reference state, Δ S (ρ‖σ₀) > 0, generating a robust, redundant causal record. The on-shell condition p^μp_μ = m²c² is the implementation of this entropic criterion in weakly coupled perturbative QFT; it is not the fundamental definition and does not constitute a claim of sharp spacetime localization (see the relevant section for the explicit response to Reeh-Schlieder and LSZ concerns). This criterion is basis-independent, non-perturbative, and introduces no new fundamental constants (no new coupling constants, masses, or collapse-rate parameters analogous to GRW's λGRW; threshold values such as Δ S^* appearing in specific models are functions of the environmental coupling, not free parameters of the theory). To reconcile a globally consistent wave function with special relativity, the Tomonaga-Schwinger equation establishes a foliation-independent global update mechanism. We derive a consistency condition demonstrating that RAQM's actualization map preserves identical observable statistics at spacelike-separated points regardless of hypersurface choice---a derived result, not a postulate---strictly forbidding superluminal signaling via algebraic microcausality. The no-signaling result applies rigorously to the non-selective (outcome-averaged) actualization map; conditioned branches are treated explicitly. Three specific, discriminating empirical predictions are stated: a finite actualization propagation velocity bounded by the Lieb-Robinson speed, an environment-dependent transition duration scaling as ℏ/Δ Eₑnv, and a sharp reversibility threshold at the actualization criterion. RAQM is distinguished from Relational Quantum Mechanics (which relativizes facts), dynamical collapse models (which ground collapse in stochastic gravitational thresholds rather than causal interaction), decoherence-only models (which leave the outcome problem open), and Everettian Many-Worlds (which denies definite events). Classical behavior emerges dynamically when continuous actualization events eliminate all unconstrained degrees of freedom. The companion papers RAGC and RACI extend these results to gravity, cosmology, and biological complexity; RAHC extends the framework to the emergence of agentic intelligence. Recent results: the Einstein field equations are the unique consistent macroscopic description of the RA causal graph via BDG uniqueness (Benincasa c = lP/tP is derived as the maximum causal bandwidth rate and E = γ mc² from discrete counting alone; the Causal Firewall threshold is proved via the Erdős-Rényi percolation theorem; and the Poisson-CSG generative measure makes the causal graph dynamics local and environment-dependent for the first time in any sequential-growth formulation. The RA Lean 4 corpus now comprises 176 verified theorems across eight files with one intentional sorry (the LQI adapter). Amplitude locality is proved as a theorem of discrete DAG dynamics; causal invariance is unconditional with zero sorry tags.
Joshua Sandeman (Wed,) studied this question.