Does OFAC apply to Layer 2 networks?
Yes, OFAC applies to every blockchain layer, so Arbitrum, Optimism, and Base transactions carry the same screening duty as mainnet.
TL;DR
TL;DR: Yes. OFAC applies to all blockchain layers equally, including Layer 2 networks like Arbitrum, Optimism, and Base. A transaction on an L2 is subject to the same sanctions rules as one on Layer 1.
Why layers do not change the rule
OFAC designates wallet addresses and persons, not consensus layers. A transfer on an L2 is still a transaction with a counterparty, and if that counterparty is on the Specially Designated Nationals and Blocked Persons List, the transaction is prohibited. Strict liability applies regardless of which network settles the transfer, so intent is not required and penalties start at over $350,000 per violation.
Screening L2 addresses the same way
The screening step is identical for L2s. sanctionsai.dev checks a wallet against 947 OFAC-listed crypto wallets and 19,218 SDN names in one HTTP call under 100 ms, returning clean (ALLOW) or flagged (BLOCK). Because OFAC lists addresses rather than chains, the same check covers activity on any network, synced hourly from US Treasury data.
Practical points for L2 builders
- Screen before sequencing or finalizing an L2 transfer.
- Do not assume cheaper or faster L2s are lower risk.
- Log each decision so compliance is auditable across chains.
Scale and speed are engineering features, not exemptions from sanctions screening.
As L2s grow, their operators and apps are increasingly the first place a sanctioned wallet tries to move funds, which makes pre-sequencing screening a real defense.