This document defines the Judgment Event Protocol (JEP), a minimal verifiable log format for decision-related operations in agent systems. JEP specifies four immutable event verbs (J, D, T, V), a signed JSON event structure, anti-replay protection, detached JSON Web Signature (JWS) verification over JSON Canonicalization Scheme (JCS) canonicalized payloads, event hash and reference semantics, validation modes, and a modular extension framework. JEP is intended to provide global protocol-level interoperability for verifiable decision event records. It does not define legal liability, authorization validity, regulatory compliance, or organizational trust decisions.