To document the source of cryptocurrency funds, show how the specific assets under review were acquired and trace their movement to the wallet, exchange, or bank account involved. A clear dated chronology, supported by relevant exchange, bank, payment, or other records, is usually more useful than a wallet screenshot alone. The exact documents depend on the reviewer’s request, jurisdiction, and circumstances; there is no universal crypto evidence package.
Start by clarifying what the reviewer needs
Read the request carefully and, if anything is unclear, ask the bank, exchange, or other institution to confirm the scope before sending documents. Clarify the accounts or wallets, assets, date range, transactions, and accepted file formats. Use the institution’s verified contact channel and its secure submission process.
There are two related but distinct questions a reviewer may ask:
- Source of funds: where the particular funds came from and how they were obtained before they were sent. The European Commission’s 2022 AML training manual describes the concept in those terms.
- Source of wealth: how a person’s overall assets or wealth accumulated, such as through earnings, inheritance, a property sale, or investment gains. A reviewer may request this broader context as well as, or instead of, the origin of a specific transfer.
EU Directive 2015/849 includes obtaining source-of-funds and source-of-wealth information among enhanced due diligence measures in specified higher-risk circumstances, including certain relationships or transactions involving high-risk third countries. That is a jurisdiction-specific provision, not a universal requirement for every crypto holder.
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Build a traceable chronology
Organize the evidence around the specific funds being reviewed. Start at the actual acquisition or payment and follow the assets through relevant conversions and transfers to the destination account. Match dates and amounts across records, and explain differences caused by fees, exchange rates, conversions, or transfers when they matter.
A simple table can help a reviewer follow the sequence:
| Date | Asset and amount | From and to | Transaction reference | Supporting record |
|---|---|---|---|---|
| When the event occurred | Asset and quantity, with any relevant fiat value | Exchange, bank account, or wallet involved | Exchange reference or on-chain transaction ID, if available | Statement, trade record, invoice, or other file |
Include transfers between your own wallets or platforms rather than leaving apparent gaps. Where a movement appears in one record but not another, identify the related entry and explain the connection. A blockchain transaction can help show that assets moved between addresses, but it does not by itself establish who controlled an address or how that person originally acquired the assets.
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Choose records that match how you acquired the crypto
There is no single document that proves every acquisition route. Include the records that exist for your actual circumstances and that connect the origin to the funds under review.
Purchased through an exchange
Use exchange account statements or transaction history to connect fiat deposits to trades and withdrawals. Add bank statements showing the corresponding fiat deposits or payments. If assets moved to another exchange or a self-hosted wallet before reaching the reviewed account, include the relevant withdrawal and receiving-side records where available.
Received as payment or compensation
For crypto paid for work, goods, or services, provide relevant invoices, contracts, payroll records, or payment statements, together with transaction details that link the payment to the assets being reviewed. Choose records that fit the payment arrangement; a generic wallet screenshot may show receipt but not why the payment was made.
Earned through mining or staking
Where applicable, use available mining or staking statements and transaction records to show the relevant receipts and subsequent movements. Explain the time period and how the amounts relate to the funds in question.
Received through a gift, inheritance, or asset sale
Use documents that reflect the actual event, such as a sale agreement or other sale record, inheritance documentation, or a written gift record, alongside transfer details connecting the received crypto to the account under review. The appropriate evidence depends on the transaction and what records exist.
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Assemble a concise submission
- Identify the request. Note the reviewed account, relevant assets, and requested date range in a short cover note.
- State the acquisition route. Briefly explain whether the relevant assets were purchased, received as payment, earned, gifted, inherited, or obtained another way.
- Attach the chronology. List material acquisition and transfer events in date order, with amounts, platforms or wallets, references when available, and the supporting file for each step.
- Add the records for each leg. Include relevant bank, exchange, payment, sale, or other documentation that substantiates the sequence.
- Explain discrepancies or gaps. Where records do not line up exactly, explain why—for example, fees, conversions, or a missing historical record—and provide any reliable alternative record you have.
- Submit securely and retain a copy. Follow the institution’s stated process, send only what is relevant to its request, and keep a copy of what you submitted.
This is a practical way to make a review understandable, not a regulator-prescribed checklist or a guarantee that a reviewer will accept a particular record.
What the records can—and cannot—establish
Exchange statements, bank records, invoices, and other business records can help connect an acquisition to a specific transfer. On-chain data can help establish that a transaction occurred between addresses. Neither should be described as proving more than it shows: a transaction record alone may not identify the person who controlled the sending address, explain the original acquisition, or establish the purpose of a payment.
For a useful packet, assess each record against five questions:
- Does it connect the acquisition source to the specific funds being reviewed?
- Can its dates and amounts be reconciled with the other records?
- Is it an original record or a reliable business-record equivalent?
- Does it cover the reviewer’s stated timeframe and scope?
- Can someone unfamiliar with the transaction follow it without guessing?
These are practical organizing criteria, not an official regulator scoring system.
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Keep customer documentation separate from institution rules
FinCEN’s 2007 guidance on suspicious activity report (SAR) supporting documentation says covered financial institutions must keep a copy of the SAR and original or business-record-equivalent supporting documentation for five years from filing, and provide the documentation upon request by specified authorities. This is an institution recordkeeping rule for SAR materials, not an automatic five-year retention requirement for every customer’s personal crypto records.
FinCEN’s BSA FAQ, Question 18(d), says that people conducting an MSB’s internal BSA review should document the review’s scope, procedures, any transaction testing, findings, and recommendations. That guidance concerns an MSB’s internal review; it is not a customer submission rule.
In separate 2013 U.S. guidance, FinCEN distinguished users of convertible virtual currency from administrators and exchangers. It said a user who obtains virtual currency and uses it to purchase goods or services is not an MSB under the cited regulations for that activity alone, while administrators and exchangers may be money transmitters unless an exception or limitation applies. This dated guidance concerns regulatory classification in the United States; it does not determine whether a bank may ask a customer to document a transfer.
Quick Recap
Common mistakes to avoid
- Using “source of wealth” and “source of funds” as if they mean the same thing.
- Sending only a wallet screenshot when the question is how the assets were acquired.
- Leaving self-to-self transfers or exchange-to-exchange movements out of the timeline.
- Claiming that an on-chain transaction alone proves identity, ownership, or original source.
- Treating a financial institution’s SAR recordkeeping duty as a customer’s personal retention rule.
- Assuming one checklist applies in every country or that any specific document guarantees acceptance.
- Sharing seed phrases or private keys. They are not needed to document transaction history; verify any unusual request through the institution’s known official contact channel.
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