How do you check if a crypto address is flagged?

To check if a crypto address is flagged, you look it up in a few places: the US Treasury's sanctions list, a block explorer's address page, and community scam report sites. No single free tool shows everything, because the most detailed risk scores sit inside paid analytics products that exchanges use. The basic format check comes first and is covered in how to check if a crypto address is valid.

How do you run an OFAC sanctioned address check?

OFAC, the Treasury office that runs US sanctions, lists some crypto addresses on its Specially Designated Nationals (SDN) List. Each appears in an entry labeled Digital Currency Address with the coin's symbol. OFAC's FAQs say to enter the full address in the ID # field of its Sanctions List Search tool. That field does not use fuzzy matching, so only an exact match comes back. Bulk users can screen against OFAC's downloadable list files instead.

OFAC warns that its address listings are not likely to be exhaustive. An address missing from the list is not proof that it carries no sanctions risk, since listed people may use other wallets. What sanctions mean for anyone dealing with a listed address is in what are OFAC crypto sanctions.

Some older free tools have gone away. Chainalysis launched a free on-chain sanctions oracle in March 2022, but its documentation now marks it deprecated, with the last update on March 18, 2026, and says it should not be used for new sanctions screening.

How do you check a wallet address for scams?

Paste the address into a blockchain explorer for its network. Etherscan says it presents addresses neutrally, and only adds a label and public notice once a reported address is proven to be involved in scams or phishing. Anyone can report an address through its Report/Flag Address form, but a report does not create a label until the team reviews it.

Community databases add another layer. Chainabuse, documented on TRM Labs' site, lets victims file scam reports, add case details and choose to share contact details with law enforcement. These reports come from users, so a listing is a lead to look into rather than a verdict.

What is tainted crypto?

Tainted crypto is a loose term for coins that trace back to a flagged source, such as a hack, scam or sanctioned party. Because blockchains are public, exchanges run deposits through screening software, as described in what is Chainalysis. OFAC's FAQs say a US firm holding crypto it must block has to prevent all access and report it within 10 business days.

Stablecoin issuers can act at the token level too. Tether said on September 28, 2026 that it had aligned its wallet freezing policy with the SDN List and had supported more than $5 billion in freezes overall. A frozen USDT balance cannot be moved, which is one route covered in can crypto be frozen.

Rules differ by country and change often. Check the regulator or a qualified professional for your own situation.