The institutional position a Governing Body holds in its ecosystem — recognized by members, regulators, and trading partners as legitimate, neutral on commercial matters between members, and accountable through governance rather than market. The trust authority is what makes a Governing Body infrastructure rather than service: it converts individual transactions and individual relationships into industry-wide trust, and it earns the seat the Governing Body holds at regulatory and standards tables. AI does not eliminate the need for a trust authority; it moves the operational ground on which the authority must operate, and threatens the authority of any Governing Body that does not defend its position in the new medium.