This paper introduces the Noēsis Protocol, a decentralized epistemic framework grounded in Spinoza's [1] metaphysics and formalized through the Theory of Relational Adequacy (TRA). The protocol redefines truth as recursive actualization within an evolving field of clarity (Φ), replacing static correspondence models with structural participation. A formal graph-theoretic model is presented, detailing how reflections (user-submitted expressions) are parsed into causal graphs and evaluated for adequacy. The protocol incorporates dynamic alignment with a system-wide causal model and enables governance via a novel Proof-of-Adequacy (PoA) mechanism. Applications in AI alignment, decentralized governance, and collective cognition are explored.