VAST-2.0-ctv-universaladid-registry-format
UniversalAdId extension idRegistry should be a registry name, root domain or unknown
Short answer
Use a registry name, a root domain such as ad-id.org, or unknown. A full URL, a domain with a path or a value containing whitespace receives a warning. The validator does not contact registries.
Why this matters in production
This rule is a strong risk signal. Tags with this issue often still parse, but they become brittle across SDKs, SSAI resolvers, and CTV environments. These rules validate supplied standardized payloads carried in legacy VAST extensions. Correct version and location handling preserves compatibility while checking ID registries, mezzanine assets, SIMID payloads and creative bindings. Optional addendum features remain optional. Affected scope: VAST 2.0 and later (all versions).
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