Centralized exchanges can screen customers, account details, locations and transactions handled through their services. Blockchain analytics tools add a different view: they analyze on-chain addresses, transaction histories and relationships visible in supported blockchain data. Neither view alone guarantees compliance. For people subject to U.S. sanctions jurisdiction, OFAC calls for a tailored, risk-based program; other jurisdictions have their own rules.
How the two screening approaches differ
The distinction is mainly about the evidence each can examine. An exchange has customer and service context, including information collected during onboarding and transactions it processes. An analytics tool can add on-chain context, such as an address’s transaction history or associations identified in the data it supports. Those views may complement each other, but they are not interchangeable.
| Dimension | Centralized exchange controls | Blockchain analytics tools |
|---|---|---|
| Primary view | Customer and account information, geographic indicators, and transactions processed by the exchange | On-chain addresses, transaction histories, and address links or exposures visible in supported blockchain data |
| Examples of use in official guidance | Onboarding checks, transaction screening, geographic screening, ongoing screening and risk-based rescreening | Identifying transactions involving relevant addresses or identifying information, and supporting lookbacks and investigations |
| Important limitation | Controls need to reflect the business’s particular risks and changes to relevant sanctions lists | Capabilities depend on supported data and the tool’s methods; the official guidance cited here provides no comparative vendor accuracy or coverage benchmarks |
OFAC’s virtual-currency guidance describes both customer and transaction screening and consideration of blockchain analytics as elements that may contribute to a compliance program. It does not establish that one vendor, exchange, or type of control is superior. (U.S. Department of the Treasury, Office of Foreign Assets Control, Sanctions Compliance Guidance for the Virtual Currency Industry, 2021; New York State Department of Financial Services, Guidance on Use of Blockchain Analytics, April 28, 2022.)
What exchange screening can cover
An exchange can assess customer information in the context of its own service. OFAC guidance describes checks at onboarding, screening transactions, and maintaining screening over time. It also discusses screening for location and jurisdiction risk. The precise information available and the transactions visible to an exchange depend on its service and the facts it collects; this is not a view of every activity a customer may conduct elsewhere on a blockchain.
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Onboarding and identity information
At account opening, screening may compare customer information against relevant sanctions lists. OFAC recommends taking account of misspellings and variations in names and jurisdictions, including through fuzzy matching where appropriate. A possible match is a reason to investigate, not by itself a final determination that a person is sanctioned.
Transactions and continued screening
Transaction screening can assess information associated with a transfer as it passes through the exchange’s service. OFAC also describes ongoing screening, risk-based rescreening and lookbacks. These controls matter because a customer, counterparty, address or relevant listing may change after an account is opened or a transaction has occurred. A business needs procedures for escalating potential matches, resolving them and documenting the disposition.
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What blockchain analytics adds
Blockchain analytics can help identify transactions involving addresses or other identifying information associated with sanctioned persons or jurisdictions, and can support investigation of transaction histories and exposures. OFAC says virtual-currency companies may consider deploying these tools. NYDFS’s 2022 guidance emphasizes blockchain analytics for customer due diligence, transaction monitoring and sanctions screening for the virtual-currency entities within its scope.
The useful question is not simply whether a tool “screens blockchain,” but what evidence it can provide for the relevant case. In evaluating a tool, a compliance team can examine:
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- Which blockchains and data types it supports, and what activity falls outside that coverage.
- How it attributes addresses or relationships, what context supports an alert, and how uncertainty is represented.
- How often relevant data and lists are updated, and how historical activity can be reviewed.
- How alerts move into investigation, escalation, decision and recordkeeping workflows.
- What limitations the organization has documented and how staff are expected to interpret results.
These are practical evaluation questions, not official benchmarks. The cited official sources do not provide comparative accuracy, false-positive rates, or rankings for commercial analytics products.
Why address screening is not the same as name screening
OFAC defines a digital-currency address as an alphanumeric identifier representing a potential destination for a transfer and describes its relationship to a wallet. An address is not simply a customer name in another format: screening an address and screening a person’s identifying information answer different questions.
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There is also a specific limitation in OFAC’s own Sanctions List Search. Its ID field does not apply fuzzy logic to digital-currency addresses; it returns exact address matches. That warning concerns this search field and should not be generalized to every commercial analytics product. A search with no exact address match does not, by itself, resolve every sanctions issue.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to combine the evidence in a screening workflow
- Define the applicable rules and exposure. Identify the jurisdictions and sanctions regimes relevant to the business, its customers, services and transactions. OFAC obligations apply to U.S. persons and others subject to OFAC jurisdiction; the UK and other jurisdictions have their own regimes.
- Screen customer information at onboarding. Check relevant identifying information against applicable lists and use procedures for name or jurisdiction variations, including appropriate fuzzy matching.
- Screen relevant transactions. Assess available transaction and geographic information in the context of the exchange’s service. Where analytics are used, consider what on-chain address and transaction evidence they add.
- Investigate potential matches. Review the underlying customer, transaction and address evidence rather than treating a name similarity or analytics alert as a conclusive finding. Apply human review and the organization’s documented escalation process.
- Rescreen and review history based on risk. Keep controls current as lists and relevant information change; apply ongoing and risk-based rescreening and conduct lookbacks where appropriate.
- Apply the required disposition and retain records. Follow the relevant legal requirements and internal procedures for blocking, rejecting, reporting, escalation and documentation. Do not treat the analytics result itself as the legal decision.
OFAC states that sanctions obligations are the same whether a transaction is denominated in virtual currency or traditional fiat currency, and that there is no single compliance program suitable for every circumstance. Its guidance calls for a tailored, risk-based program rather than reliance on one screening method.
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Legal scope and examples that need careful handling
U.S. requirements and blocked virtual currency
The cited OFAC guidance concerns obligations of U.S. persons and others subject to OFAC jurisdiction. If a person subject to OFAC jurisdiction determines that they hold virtual currency required to be blocked, OFAC says they must deny access and comply with applicable holding and reporting rules. OFAC FAQ 646 states that the blocked virtual currency must be reported within 10 business days and annually thereafter while it remains blocked. The applicable rules and the facts of a particular case determine what action is required.
New York guidance has a defined audience
NYDFS’s April 28, 2022 letter addresses virtual-currency entities licensed under 23 NYCRR Part 200 or chartered as limited-purpose trust companies under New York Banking Law. It should not be read as a rule addressed to every exchange or every U.S. business.
UK guidance is jurisdiction-specific
A 2022 joint statement hosted by the UK Financial Conduct Authority recommends screening customers and transactions against relevant, updated sanctions lists and effective rescreening. It also says teams using analytics should understand how to apply the tools’ capabilities to higher-risk wallet addresses. This is UK-context guidance, not a substitute for determining which rules apply to a particular organization.
Absence from a list does not answer every question
OFAC FAQ 1250, dated May 1, 2026, states that Iranian digital asset exchanges meeting the regulatory definition cited there are blocked under the relevant authority whether or not they appear on the SDN List. That specific Iran-related position should not be generalized to unrelated sanctions programs. Separately, OFAC FAQ 1021 explains that Russia-related prohibitions can extend to virtual-currency transactions and urges risk-based vigilance against circumvention.
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