How OFAC sanctions impact crypto development

Sanctions shape protocol design, deployment decisions, and user interface choices for anyone building on-chain.

TL;DR

TL;DR: OFAC strict liability means crypto developers are responsible for who transacts through their software. Screening belongs in design and UI decisions, not as an afterthought.

Protocol design

Design decisions can raise or lower sanctions exposure. A smart contract that forwards payments to any address inherits the risk of every destination. Building a screening step into the flow, checking a counterparty against the SDN List before a transfer settles, narrows that exposure. OFAC's 50 Percent Rule also matters: an entity owned 50 percent or more by a blocked person is itself blocked.

Deployment decisions

Where code runs and who can call it changes compliance risk. Public, permissionless contracts can be used by anyone, so the developer cannot rely on manual review. An automated check, one HTTP call under 100 ms that returns ALLOW or BLOCK, is the practical control. The sanctionsai.dev API screens against 19,218 SDN names and 947 OFAC-listed crypto wallets, synced hourly.

User interface choices

The UI should surface risk before a user confirms a payment. A clear ALLOW or BLOCK signal, plus a risk_score for borderline cases, keeps compliance visible. Showing that screening happened also builds trust with users and counterparties.