OFAC Sanctions Screening for Crypto and DeFi: A Developer's Guide

This guide explains why crypto and DeFi platforms must comply with OFAC sanctions screening, driven by FinCEN's 2019 VASP guidance, OFAC's direct wallet address designations, and the Tornado Cash enforcement precedent. It details three mandatory screening points—customer onboarding, wallet addresses, and transaction counterparties—and provides practical integration guidance for developers building on crypto rails.