RDAP Extension for Structured Reliability Assessment Metadata

This document proposes an extension to the Registration Data Access Protocol (RDAP) that enables the representation and exchange of structured reliability assessment metadata for registrars and domain names. The extension defines a structured assessment envelope through which any registry, registrar, or third-party assessor can expose assessment results in a common, machine-readable format within RDAP responses. The extension standardizes how assessment results are transported and referenced, not how they are computed. Scoring methodologies, thresholds, criteria, and governance frameworks are intentionally left to the operational and policy layer.