As crypto adoption grows, financial services firms, law firms and other regulated professionals will increasingly engage with clients who have interacted with, invested in or generated wealth through cryptocurrencies.
For most firms, the underlying compliance requirement is familiar: evidence how the client generated their funds and assess, where possible, whether those funds may be the proceeds of crime. This might involve reviewing salary, bonuses, inheritance, the sale of a property, business income, investment gains or other legitimate sources of wealth.
Crypto does not change that obligation. But it does change the evidence trail.
Why crypto source of funds checks are different
Cryptocurrencies are pseudonymous. For example, every Bitcoin transaction ever executed is publicly viewable online, for free. But the names of the people or entities behind those transactions are not automatically disclosed.
Instead, what you see are public addresses: long strings of alphanumeric characters sending and receiving funds.
For example, a Bitcoin block explorer such as blockchain.com may show one address sending BTC 0.1097, worth approximately $3,166 at the time, to another address. But without additional context, the blockchain will not tell you who controls either address.
If you have reliable data about who controls other addresses, you can start to construct a more complete map of transaction history and run AML checks against the activity.
Using blockchain data to run source of funds analysis
Hoptrail’s tools use blockchain data to help regulated professionals understand crypto activity and assess financial crime risk.
Our datasets include more than 250 million tagged addresses, covering exchange venues, payment services, NFT marketplaces, darknet shops, mixing services, hacks, scams, sanctions exposure and other relevant categories.
Imagine the sender above was your client’s address. Hoptrail can help you analyse that wallet and assess the source of funds connected to it.
Key questions include:
Where did the funds come from? Which wallets or services has the address interacted with? Has the wallet received funds from exchanges, mixers, darknet markets, scams, hacks or sanctioned entities? Does the on-chain activity match the client’s explanation? Where did the funds go after they were received?
This turns a raw wallet address into a clearer source of funds narrative.
Following the money to the off-ramp
Once you have identified the relevant wallet activity, you can roll the analysis forward and follow the money through to the point where the client cashed out into fiat currency.
For example, if funds were sent to exchanges such as Binance or Kraken, those exchanges become an important part of the evidence trail.
In that case, the client may need to provide trading statements from those exchanges to evidence the BTC deposits, sales into GBP and any fiat withdrawals. This is usually the next and final step in assessing a client’s on-chain activity: what we call off-ramp activity.
A good source of funds review should not stop at identifying that crypto reached an exchange. It should also evidence what happened next.
Hoptrail’s onboarding checklist for crypto clients
Hoptrail’s onboarding checklist has three core requirements for crypto source of funds and source of wealth checks.
Before starting any analysis, ask each crypto client for the following information.
- Wallet addresses
Ask the client to provide all relevant wallet addresses connected to the funds under review.
This may include self-custody wallets, exchange deposit addresses, withdrawal addresses and any wallets used to receive, hold or transfer cryptoassets.
- Source of funds or source of wealth explanation
Ask the client to explain how the cryptoassets were obtained.
For example, were they acquired through salary, investment, mining, trading, inheritance, business income, token sales, NFT sales or another source?
The explanation should be detailed enough to compare against the blockchain activity and supporting documentation.
- Supporting documentation
Ask the client for documents that support their explanation.
This may include exchange statements, bank statements, trading records, payslips, contracts, sale agreements, tax records, screenshots from platforms or correspondence showing how the funds were generated and liquidated.
Where funds were cashed out through an exchange, trading statements and fiat withdrawal records are particularly important.
Proving wallet ownership
If you suspect that wallets provided by a client are not theirs, you can ask them to prove ownership.
There are several ways to do this. You may ask the client to provide documentation from the exchange or service tied to the address. You may also ask the client to send a specific amount to a designated wallet.
Another option is signature verification, which allows a client to prove control of a wallet using a cryptographic signature. This can provide either public or private cryptographic proof without necessarily requiring the client to move funds.
Bringing crypto clients into a familiar compliance process
Onboarding crypto clients does not need to be confusing.
The core principles remain the same: understand the client, understand the source of their funds, collect supporting evidence and assess financial crime risk.
The difference is that crypto introduces a new evidence layer: blockchain data.
Hoptrail helps regulated firms interpret that data, identify risk indicators and connect on-chain activity to traditional compliance documentation.
With the right questions, the right documents and the right tools, crypto source of funds checks can become a clear and repeatable part of client onboarding.