Crypto Sanctions Lawyer — Blockchain & Digital Asset Legal Defense
Our crypto sanctions lawyers advise individuals, exchanges, DeFi protocols, and digital asset businesses designated by OFAC or facing enforcement related to blockchain transactions. We challenge SDN designations, pursue wallet delistings, and defend against civil and criminal crypto sanctions violations.
Quick Answer
A crypto sanctions lawyer advises individuals, exchanges, DeFi protocols, and digital asset businesses that have been designated by OFAC, had wallets blocked, or face enforcement action related to blockchain transactions. We challenge OFAC designations, pursue SDN list removals, assist with OFAC license applications for the release of frozen digital assets, and defend clients against civil and criminal sanctions violations involving Bitcoin, Ethereum, NFTs, and decentralized finance.
Our crypto sanctions lawyers represent clients worldwide who are caught in the expanding reach of U.S. Treasury OFAC enforcement across blockchain networks and digital asset markets. As OFAC increasingly targets cryptocurrency wallets, DeFi protocols, virtual asset service providers (VASPs), and NFT platforms, having a specialized crypto sanctions lawyer is no longer optional — it is essential. We combine deep expertise in OFAC regulations with a technical understanding of blockchain infrastructure to deliver effective legal defense and compliance strategies for the digital asset economy.
Our Crypto Sanctions Legal Services
| Service | What We Handle | Jurisdiction |
|---|---|---|
| OFAC Crypto SDN Removal | Petitions to delist designated wallets and individuals from the SDN list; reconsideration requests; OFAC correspondence and appeals | USA (OFAC), Global clients |
| DeFi Protocol Sanctions Defense | Defense of decentralized protocols, DAOs, and liquidity providers facing OFAC designation or enforcement inquiry; smart contract sanctions analysis under the 50% Rule | USA, EU, Global |
| Bitcoin & Digital Asset Recovery | Legal strategy for recovering blocked or frozen Bitcoin, Ethereum, stablecoins, and other digital assets; OFAC specific license applications; coordination with exchanges | USA, UK, UAE, EU |
| Crypto Exchange / VASP Sanctions | Defense and compliance advisory for cryptocurrency exchanges, OTC desks, and VASPs subject to OFAC action; KYC/AML gap remediation; penalty mitigation | USA, EU, UK, Offshore |
| NFT & Web3 Sanctions Compliance | Sanctions screening advisory for NFT marketplaces, Web3 platforms, and token issuers; transaction monitoring policy design; response to OFAC inquiries | USA, Global |
| Tornado Cash / Mixer Sanctions Defense | Legal defense for users and developers of sanctioned mixing protocols; analysis of liability exposure; voluntary self-disclosure strategy; litigation support | USA, EU, Netherlands |
Why Crypto Sanctions Are Different
Traditional financial sanctions target banks, corporations, and identifiable individuals. Cryptocurrency sanctions operate in an entirely different technical environment — one where a single blockchain address, a smart contract, or a transaction hash can become the subject of a federal designation overnight. OFAC now maintains a dedicated list of sanctioned digital currency addresses embedded within the SDN List, and any U.S. person — including crypto exchanges, DeFi protocols, and individual users — is prohibited from transacting with those addresses regardless of whether they know the identity behind them.
Wallet screening has become a critical compliance obligation for any entity operating in the digital asset space, yet even the most sophisticated screening tools produce false positives that can freeze legitimate users’ funds without warning. Automated blockchain analytics platforms flag transactions based on proximity to sanctioned addresses — sometimes several hops removed — creating what is known as “indirect exposure.” Our crypto sanctions lawyers understand how these tools work, how to challenge their outputs, and how to present a coherent legal and technical defense when a client’s wallet has been incorrectly associated with prohibited activity.
OFAC’s extension of its 50% Rule to smart contracts and decentralized protocols represents one of the most consequential and legally contested developments in sanctions law. The Tornado Cash litigation has put these questions before the federal courts, with the Fifth Circuit’s 2024 ruling drawing a critical distinction between immutable smart contracts and other property types — a distinction that has significant implications for every DeFi protocol operating today.
OFAC’s enforcement posture toward digital assets has hardened substantially since 2018, when it first added Bitcoin addresses to the SDN List. The agency has since sanctioned ransomware payment infrastructure, darknet markets, state-sponsored hacking group wallets, mixing services, and entire blockchain-based financial ecosystems. Civil monetary penalties in the crypto space have exceeded hundreds of millions of dollars. Our crypto sanctions lawyers work at the intersection of regulatory law, blockchain technology, and federal litigation.
Key OFAC Enforcement Actions in Crypto
| Date | Entity / Target | OFAC Action | Outcome |
|---|---|---|---|
| August 2022 | Tornado Cash | SDN designation of smart contract addresses; first-ever sanctioning of an open-source mixing protocol | Fifth Circuit partially reversed November 2024 — immutable smart contracts not “property” under IEEPA; co-founder Roman Storm faces criminal trial |
| 2016–2023 | Bitfinex Hack Addresses | Bitcoin addresses linked to 2016 Bitfinex hack added to SDN List; DOJ seized ~94,000 BTC (≈$3.6B) | Lichtenstein & Morgan pleaded guilty to money laundering; largest financial seizure in DOJ history |
| 2018–ongoing | Lazarus Group (DPRK) | Hundreds of ETH/BTC wallet addresses added to SDN List; linked to Ronin Network ($625M), Harmony Bridge hacks | Ongoing designations; significant assets frozen across multiple exchanges worldwide |
| April 2022 | Hydra Market | SDN designation; coordinated with German law enforcement shutdown; $25M+ in Bitcoin seized | Platform shut down; servers seized in Germany; follow-on enforcement against U.S. users ongoing |
| April 2021 | BitcoinFog (Roman Sterlingov) | Indictment for operating Bitcoin mixing service; OFAC designated associated addresses; 1.2M BTC laundered | Convicted at trial March 2024 on money laundering charges; mixer addresses remain on SDN List |
Our Crypto Sanctions Practice Areas
DeFi Sanctions Lawyer
DeFi Sanctions Lawyer — learn more about this service area.
Decentralized finance presents unique sanctions risks that traditional legal frameworks were never designed to address. Our DeFi sanctions lawyers advise protocol developers, liquidity providers, DAO participants, and DeFi users who face OFAC scrutiny, wallet blocking, or enforcement inquiries arising from their involvement with decentralized exchanges, lending protocols, and yield aggregators.
Bitcoin Sanctions Lawyer
Bitcoin Sanctions Lawyer — learn more about this service area.
Bitcoin remains the most frequently sanctioned digital asset, with OFAC maintaining an ever-growing list of designated BTC addresses linked to ransomware actors, darknet markets, state-sponsored hackers, and sanctions evaders. Our Bitcoin sanctions lawyers help individuals and businesses whose Bitcoin has been frozen by exchanges, challenge erroneous blockchain analytics flags, and pursue OFAC specific license applications to recover blocked funds.
NFT & Web3 Sanctions Compliance
NFT & Web3 Sanctions Compliance — learn more about this service area.
NFT marketplaces, Web3 gaming platforms, token launch projects, and metaverse developers face a rapidly evolving sanctions compliance obligation. Our NFT and Web3 sanctions lawyers help platforms implement effective wallet screening, respond to OFAC subpoenas, and navigate the complex question of whether NFT transfers with sanctioned wallets constitute prohibited transactions under U.S. law.
Crypto Exchange Defense
Crypto Exchange Defense — learn more about this service area.
Cryptocurrency exchanges and VASPs are on the front line of OFAC enforcement, facing substantial civil monetary penalties for processing transactions that touch sanctioned addresses. Our crypto exchange defense lawyers advise exchanges through OFAC investigations, negotiate penalty settlements, prepare voluntary self-disclosures, and build remedial compliance programs that demonstrate good faith to regulators.
FATF Travel Rule Compliance for Crypto Businesses
FATF Travel Rule Compliance for Crypto Businesses — learn more about this service area.
Virtual asset service providers operating across multiple jurisdictions face overlapping OFAC and FATF obligations that are increasingly enforced in tandem. Our FATF travel rule crypto lawyers help exchanges, custodians, OTC desks, and stablecoin issuers build FATF Recommendation 16-compliant programs — selecting interoperability protocols including TRISA and Sygna Bridge — while ensuring counterparty VASP screening satisfies OFAC’s strict liability standard across all applicable sanctions programs.
Crypto Sanctions Compliance Program Development
Crypto Sanctions Compliance Program Development — learn more about this service area.
Proactive sanctions compliance architecture is the most cost-effective shield against OFAC liability for any digital asset business. Our crypto sanctions compliance lawyers design and implement OFAC compliance frameworks for exchanges, DeFi protocols, NFT marketplaces, and payment processors — covering risk assessment, SDN screening workflows, blockchain analytics integration via Chainalysis or TRM Labs, FinCEN MSB registration, and MiCA CASP authorization for EU operations.
OFAC Cryptocurrency Sanctions — Full Legal Framework
OFAC Cryptocurrency Sanctions — Full Legal Framework — learn more about this service area.
Effective crypto sanctions defense requires understanding OFAC’s complete enforcement framework — from SDN wallet address designations and the 50% Rule’s application to smart contract clusters, to the statutory basis under IEEPA and TWEA. Our OFAC cryptocurrency sanctions lawyers advise clients across all major enforcement scenarios: wallet freezes, exchange blocking actions, voluntary self-disclosure, specific license applications, and SDN delisting petitions.
If your digital assets have been frozen, your exchange account blocked, or your business has received an OFAC inquiry related to cryptocurrency, contact us today for a confidential consultation.
Frequently Asked Questions About Crypto Sanctions
What happens when OFAC designates a crypto wallet?
When OFAC adds a cryptocurrency wallet address to the SDN List, all U.S. persons and entities — including exchanges, DeFi protocols, and payment processors — are immediately prohibited from processing any transaction involving that address. Any digital assets in or associated with the designated wallet are considered blocked property. U.S.-based exchanges must freeze the account and report the blocking to OFAC within 10 business days. Non-U.S. exchanges with U.S. customers or U.S. dollar transaction exposure face secondary sanctions risk if they continue to service the designated wallet. The owner of the designated wallet should immediately engage a crypto sanctions lawyer to assess their delisting options, potential OFAC license applications, and litigation strategy.
Can decentralized protocols be sanctioned by OFAC?
Yes — OFAC demonstrated this conclusively with its August 2022 designation of Tornado Cash. However, the Fifth Circuit Court of Appeals ruled in November 2024 that immutable smart contracts — computer code that cannot be altered after deployment — do not constitute “property” under the International Emergency Economic Powers Act (IEEPA) and therefore cannot be sanctioned under that authority. This ruling creates important distinctions between immutable and upgradeable protocols, and between the protocol itself and associated governance tokens, front-end interfaces, and developer entities. The legal landscape continues to evolve rapidly, and DeFi protocols should obtain specialized legal counsel to assess their sanctions exposure.
How does the Tornado Cash case affect DeFi users?
The Tornado Cash case has created significant legal uncertainty for DeFi users who interacted with sanctioned protocols — whether knowingly or unknowingly. OFAC’s position is that any U.S. person who submitted a transaction to Tornado Cash after its designation violated sanctions, regardless of intent. However, OFAC has also issued guidance acknowledging that some users may have legitimate defenses. Users who interacted with Tornado Cash or other sanctioned DeFi protocols should consult with a crypto sanctions lawyer to assess their individual exposure and determine whether voluntary self-disclosure or other remedial steps are advisable.
What should a crypto exchange do when a customer is sanctioned?
When a crypto exchange identifies that a customer has been designated on the SDN List, it must immediately freeze the customer’s account and all associated assets. The exchange must file a blocked property report with OFAC within 10 business days and submit an annual blocked property report thereafter. The exchange should not return assets to the customer, transfer them to a third party, or release them without specific OFAC authorization. The exchange should also conduct a look-back review to identify any transactions that may have been processed after the customer’s designation date. Failure to comply exposes the exchange to significant civil monetary penalties and potential criminal liability.
Is using a sanctioned crypto mixer a violation even unknowingly?
Under OFAC’s strict liability framework, knowingly or unknowingly transacting with a sanctioned entity or address can constitute a sanctions violation — intent is not required for civil liability. However, OFAC’s enforcement guidelines establish that the agency exercises significant discretion based on factors including the apparent willfulness of the violation, the sophistication of the party, the harm to sanctions program objectives, and any remedial steps taken. Users who unknowingly interacted with a mixer before or after its designation may have substantial mitigating factors. If you believe you may have transacted with a sanctioned mixing service, consult a crypto sanctions lawyer before taking any action or making any disclosures.