The structural requirement that entity claims appear in multiple independent, authoritative sources before AI systems will cite them with confidence. Single-source claims trigger hallucination-avoidance behavior; corroborated claims are cited. The minimum viable corroboration threshold is 5 independent tier-1 or tier-2 sources for each core entity attribute. Corroboration is not ‘mentions’ — it is structured, attributed, verifiable repetition of the same claim across sources that AI systems recognize as authoritative. The corroboration requirement makes earned media and third-party validation mechanically load-bearing in entity infrastructure.