Abstract. Where identity, sanctions, travel rule, audit, and twelve other obligation categories fire — and where they don't. Each row a regulatory category; each column a payment rail. Lit cells mean at least one path on that rail triggers a checkpoint in that domain.
The compliance floor. Five domains fire universally across all eight rails: C1 Identity & Due Diligence; C2 Sanctions; C8 Operational Resilience; C11 Recordkeeping; C12 Audit & Attestation. No stablecoin payment avoids them.
What the gaps reveal. The absences are as informative as the coverage. C4 Fraud fires on Retail, DeFi, and Tokenized Deposits — the rails with direct consumer exposure. C15 Dispute Resolution concentrates on Wholesale, Securities, and Post-Trade — institutional rails with contractual counterparties.
The bottom line. The matrix makes structural patterns visible at a glance.