OFAC is the US Treasury bureau that sanctions specific crypto addresses, and transacting with them is prohibited under strict liability regardless of intent; Plastron screens your wallet against the OFAC SDN list free.
OFAC and Crypto Wallets — What You Need to Know
OFAC sanctions apply to crypto wallet addresses the same way they apply to bank accounts — and exchanges enforce them automatically using blockchain analytics on every deposit.
The Office of Foreign Assets Control is a bureau of the US Treasury Department responsible for administering and enforcing economic sanctions programmes. Most people associate OFAC with international politics — sanctions on Russia, Iran, North Korea, Venezuela, Cuba. Few people realize that OFAC has been actively applying sanctions to cryptocurrency since 2018, when it first added Bitcoin addresses to the Specially Designated Nationals list. Since then, hundreds of crypto addresses across multiple blockchains have been designated, covering state-sponsored hackers, ransomware operators, illegal darknet markets, and, controversially, the Tornado Cash smart contracts. The legal standard for OFAC compliance is strict liability: a US person who transacts with an SDN-listed address has violated sanctions law regardless of whether they knew the address was designated. This is not a knowledge-based standard — you cannot rely on not knowing. OFAC does grant licenses for certain transactions involving sanctioned parties, and it applies a voluntary disclosure process that reduces penalties for companies that self-report violations. But for individuals, the practical guidance is to avoid transacting with SDN-listed addresses entirely, which requires knowing what those addresses are. Exchanges are required to screen all transactions by US customers against the OFAC SDN list and to freeze any funds associated with designated addresses. They are also expected to apply enhanced due diligence to wallets with indirect sanctions exposure — addresses that have received funds from or sent funds to SDN-listed entities. The cumulative effect is that any wallet that has touched OFAC-designated addresses at any point in its history faces compliance risk at regulated exchanges, even if the user had no knowledge of the sanctioned counterparty.
How Plastron Helps
Weekly-Updated OFAC SDN Screening
Plastron updates its OFAC data weekly from the official US Treasury SDN XML feed. Every scan checks your wallet's counterparties against the current list of crypto-relevant SDN designations. Direct SDN counterparty matches are flagged Critical. Indirect one-hop exposure scores High. The report shows the designation category (North Korea, Iran, Russia, etc.) and the specific addresses involved so you understand the nature of the exposure.
Sanctions Category Breakdown
Not all OFAC designations are equal in the eyes of exchange compliance teams. North Korean Lazarus Group designations trigger the most aggressive exchange responses because of the large volumes involved and active law enforcement attention. Tornado Cash designations are widespread but increasingly nuanced after the Fifth Circuit ruling. Plastron's sanctions category report identifies which designation category applies to each flagged counterparty, helping you assess the compliance priority.
Pre-Transaction OFAC Clearance
For any transaction involving a significant amount of ETH or an unfamiliar counterparty, a pre-transaction OFAC screen using Plastron provides evidence of reasonable care. If your wallet scans clean immediately before a deposit, you have documentation that you checked for OFAC exposure at the time of the transaction. This documentation matters if a flag surfaces later that was not present at the time of the scan.
Risk Categories We Screen
Frequently Asked Questions
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