Bertoldi Cybersecurity Universita' degli Studi di Napoli Federico II 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 an RDAP server can expose assessment results produced by a registry, registrar, or third-party assessor 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. This document does, however, place requirements on the specification of any scheme whose results are intended for publication through RDAP, because publishing an evaluative judgement about an identified party without safeguards for notification, remediation, and contestation is not a safe practice.