The five-call cross-border KYB workflow — walking a UBO chain across jurisdictions in a single prompt

KYB ("Know Your Business") used to mean "pull a company report and check the directors." That stopped being enough around the time the FATF revised Recommendation 24 in March 2022 and AMLD5 transposition deadlines started biting. A modern KYB review for a counterparty of any meaningful size has to:

Identify the legal entity in the jurisdiction it claims to be incorporated in,

Identify everyone who owns more than 25 % (or controls via voting / appointment / contract),

Walk through any corporate layer above that — because step 2 will almost always return another company rather than a human,

Repeat until you reach a natural person, a listed issuer, a state, or a bona-fide statutory exception,

Cite the registry of record at every hop so the audit trail survives a regulatory review.

That last point is what breaks every "we have a company-data API" SaaS: the moment the counterparty is in a different…