Short answer: not for every crypto client or every crypto transaction. But for large amounts or higher-risk cases, Source of Wealth is increasingly becoming a compliance necessity — and the direction of EU regulation is very clear.

For years, many crypto exchanges treated crypto Source of Wealth (SoW) as something optional: an extra investigation reserved for particularly difficult clients.

That view is becoming harder to defend as bank standards are imposed on exchanges. Source of Wealth has been a tool used in banks for decades, and now that banks are entering the crypto market, there needs to be a level playing field.

So, what does European regulation actually say?

Today, European AML rules already require enhanced measures in specific higher-risk situations. Source-of-Wealth and Source-of-Funds checks are expressly required for reasons such as:

  • KYC risk: politically exposed persons and certain other higher-risk relationships.
  • Higher amounts: what counts as “higher” depends on the venue and even the country — we have seen thresholds ranging from €5,000 to €5 million.
  • Origin of funds: the platforms and products a client has used.

Does this apply to exchanges?

Yes. Crypto-asset service providers are also subject to the EBA’s crypto-specific AML/CFT risk-factor guidelines, issued on 16 January 2024. The EBA explicitly expects CASPs to apply stronger mitigating measures when risk is elevated, rather than treating ordinary KYC or transaction monitoring as sufficient. It states directly that, in certain cases, a Source-of-Wealth investigation may be the only way to approve a client or a transaction.

And the regulatory direction becomes even clearer with the EU’s new Anti-Money Laundering Regulation (AMLR). From 10 July 2027, the AMLR will apply directly across the EU. For higher-risk relationships, it explicitly lists obtaining additional information about the customer’s Source of Funds and Source of Wealth among the enhanced due diligence measures available to obliged entities. AMLA is now developing the detailed technical standards that will determine how these requirements are applied in practice.

Does that mean every €10,000 crypto transfer needs a 30-page SoW report?

No. European AML regulation remains risk-based.

A small, straightforward transaction from a well-understood customer is very different from onboarding a client who wants to deposit €5 million generated over ten years of Bitcoin trading, DeFi, multiple exchanges and self-custodied wallets. The higher the risk, complexity and value, the harder it becomes to answer the compliance question without looking at Source of Wealth.

And this is where crypto creates a particular problem. A blockchain analysis tool can tell you where coins travelled and whether wallets have known risk exposure. It cannot, on its own, answer the real question: how did this person actually become wealthy?

Answering that requires looking beyond a single incoming transaction — at exchange histories, wallets, fiat inflows, trading gains, investment activity and the accumulation of wealth over time. ChainComply’s approach is therefore to test whether the client’s explanation is complete and consistent with the underlying transaction data, rather than treating individual blockchain alerts as definitive.

The practical answer

So, is crypto Source of Wealth mandatory in Europe?

Not automatically, simply because an asset happens to be crypto. But where a bank, CASP or other regulated institution identifies a relationship or a transaction as higher risk — and a Source-of-Wealth review is necessary to understand and mitigate that risk — performing an adequate SoW assessment is no longer a “nice-to-have”.

And as AMLA moves Europe towards a harmonised AML rulebook, the expectation that institutions can understand and defend the origin of significant crypto wealth is only growing stronger.

The real question for compliance teams therefore is not “Do we have to perform crypto SoW on everyone?” It is: “If the regulator asked us tomorrow how this client made their €250,000 in crypto, could we prove the answer?”

That is the standard institutions should be preparing for.

If you need to understand and evidence crypto Source of Wealth end-to-end — from raw exchange and on-chain data to a structured, audit-ready narrative — ChainComply is built for exactly that. Book a demo here: chaincomply.io/contact.