A trust authority is the institutional party whose certification is treated as canonical for a particular domain. Members rely on its certifications; external parties — regulators, auditors, counterparties, adjudicators — accept its certifications as the authoritative answer for the questions it covers.

Trust authorities exist across nearly every domain where structural correctness matters at scale:

• Trade and customs compliance — national and regional industry trade associations (sector federations, freight-forwarder associations, importer/exporter councils) and the customs administrations themselves.
• Materials and engineering standards — ASTM International, ISO, IEEE, NIST.
• Legal interpretation — bar associations, state supreme courts on rules of professional conduct, the American Law Institute on Restatements.
• Financial reporting — FASB and IASB on accounting standards; the auditing bodies themselves on assurance.
• Medical practice — specialty boards and national colleges on practice guidelines and certifications.

What distinguishes a trust authority from a domain expert is institutional standing. An expert can be deeply knowledgeable and produce excellent work product, but their warrant is personal: it lives or falls with their reputation. A trust authority's warrant is institutional: it lives with the institution and is backed by the institution's accumulated standing, governance processes, and capacity to defend its positions.

The relationship between trust authority and certification is constitutive — certification is what trust authorities produce, and a trust authority's standing is what gives its certifications weight. When a trust authority certifies an artifact, the certification carries the institution's authority precisely because the institution is a trust authority for the relevant domain. The mutual dependency is the structure.

The Rosie architecture's value proposition depends on making trust authorities' certifications structurally addressable:

• Every certified artifact preserves the certifying authority's identity, the certification date, the version of the corpus reviewed, and the specific attestations cited.
• Citations to certified artifacts can be machine-verified against the original certification record — not just "we trust the interpretation" but "we can prove this is the version the trade association certified on this date."
• When trust authorities update their positions, the cascade of dependent artifacts can be traced and reviewed; nothing rides on stale certifications without anyone noticing.

Worked example: an importer cites a trade compliance interpretation in a customs audit response. The interpretation was certified by an industry trade association in 2025-Q3 against the version of the corpus then current. Two years later, the audit defense rests on showing not just "the trade association said this" but "this specific interpretation, certified on this date, under these standards, with these underlying attestations." The platform preserves all of that as a permanent, structurally-addressable record — and the structural addressability is what makes the trust authority's role legible to every downstream party.