How should compliance teams handle sanctions risk in DeFi and crypto service providers?

How sanctions risk shows up in DeFi and crypto service providers

Sanctions exposure is not limited to opening an account, because DeFi and crypto service-provider flows often involve wallets, smart contracts, routing layers, and transaction approval paths that sit outside classic onboarding. Compliance teams therefore need to evaluate the interaction itself, including who is connected, where value is routed, and whether the transaction or counterparty profile triggers escalation before execution.

That shifts the control objective from static customer screening to ongoing screening of counterparties, addresses, and related infrastructure. In practice, the highest-risk points are where a wallet is connected, a route is selected, or a transfer is approved, because those are the moments when prohibited exposure can be introduced or blocked.

What controls belong at wallet, routing, and approval points

The practical control model is policy-driven screening at the transaction edge. A compliance programme should define when a wallet connection is acceptable, when routing through a protocol or intermediary is allowed, and when a transaction must be paused for review. This is especially important where service providers facilitate access to multiple venues, bridges, or pools, because the sanctions question may arise from the path as much as the destination.

Screening also needs to account for related infrastructure, not only the visible counterparty. A sanctioned actor may appear indirectly through shared infrastructure, reused wallets, intermediary services, or layered routes, so teams should treat the full transaction context as the unit of review rather than relying on onboarding records alone.

For teams formalising this control stack, FinCEN remains a useful reference point for sanctions-adjacent AML expectations, while OAuth 2.0 authorization flows illustrate the broader principle that access decisions should be enforced at the point of action, not only at enrollment.

Where crypto platforms also manage keys, signing workflows, or hot-wallet operations, NIST SP 800-57 Key Management is relevant because key lifecycle discipline affects who can move value and how quickly access can be revoked after risk is detected.

How escalation rules and exception handling should work

Escalation rules should be prewritten, measurable, and tied to specific risk triggers. If a counterparty, address cluster, route, or associated infrastructure appears high risk, the transaction should not simply proceed with a warning banner. It should move into a defined review path with clear ownership, response times, and documented disposition criteria.

This matters because DeFi and service-provider models often compress decision time. If analysts must improvise each exception, the organisation will either block too much legitimate activity or allow too much uncertain activity. A good process distinguishes routine screening from cases that require enhanced due diligence, legal review, or denial, and it records why the final decision was made.

Where the organisation operates in a cloud or vendor-heavy environment, CSA Cloud Controls Matrix and SOC 2 Trust Services Criteria are useful for structuring third-party review, control ownership, and evidence expectations around externally provided services.

Practitioner Guidance

What to prioritise: Focus first on the points where a transaction becomes actionable, because that is where sanctions exposure is most likely to slip past account-centric controls. A compliance team should be able to explain which routing paths, wallet interactions, and approval events are auto-blocked, which are queued for review, and which are permitted only under documented exception.

What to verify: Verify that screening covers the counterparty, the wallet, and the surrounding infrastructure together. If your programme only checks onboarding data or only checks the final destination, it will miss the layered patterns that are common in DeFi and crypto service-provider workflows.

Decision rule: If the transaction context is ambiguous but the exposure could be linked to a sanctioned actor, treat the case as an escalation rather than a soft approval. The practical standard is not perfect certainty, it is whether the team has enough evidence to justify execution without breaching policy.

Practitioner takeaway: Sanctions control in these environments is a transaction-screening problem as much as a customer-screening problem, and the strongest programmes make that distinction explicit in both policy and workflow.

Related resources from NHI Mgmt Group

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• How should crypto compliance teams handle FATF’s function-based approach when deciding whether a service counts as a VASP?
• How should crypto compliance teams handle transactions that become risky only after new sanctions or adverse information emerges?