Source of funds: what you are actually being asked for

When a large conversion stalls, it is almost never because someone doubts who you are. Identity is the easy part: a document, a selfie, an address. What holds things up is the next question, and it is a harder one to answer well.

Where did this come from?

This guide explains what that question means in practice, what counts as an answer, which situations are genuinely difficult, and what to assemble before you start rather than while a payment sits in review.

Two questions that sound like one

Providers and banks ask about source of funds and source of wealth. They are related and not the same, and being asked for one when you have prepared the other is a common reason for a second round of questions.

Source of funds is narrow and specific. It asks about the particular assets in this particular transaction. Where did this Bitcoin come from? How did it get to this wallet? When was it acquired and from whom?

Source of wealth is broad. It asks how you came to have means at all. Salary over a career, a business you built and sold, an inheritance, proceeds from property. It is a picture of your financial life rather than a receipt for one holding.

A modest conversion may only prompt the first. A large one, or one that does not fit the pattern of your other activity, tends to prompt both. The larger the amount relative to what is known about you, the more the second question matters.

Why anyone asks

Anti-money-laundering rules require regulated firms to understand their customers and the activity they process, and to be able to demonstrate that understanding to a regulator afterwards. In Canada, that obligation sits with FINTRAC-registered money services businesses; equivalent regimes exist in most jurisdictions where you would want money to arrive.

That framing is worth holding onto, because it explains the behaviour that otherwise feels arbitrary. The provider is not deciding whether they believe you. They are assembling a file that has to make sense to someone reading it later, without you in the room. "The customer said it was savings" is not a file. Documents that corroborate each other are.

It also explains why the questions can return. Obligations are ongoing, not a one-time gate, so a pattern that changes tends to prompt a fresh look even for an established customer.

What actually counts as evidence

The reliable answer is documentation that connects the assets to something outside your own assertion. In rough order of how readily it is accepted:

• Exchange records showing the original purchase: date, amount, price, and the account in your name.
• Bank statements showing the money that funded that purchase leaving an account in your name.
• Transaction history linking the purchase to the wallet the assets sit in now, including the transfers between wallets you control.
• Employment or business income records where the underlying wealth came from earnings: payslips, tax filings, company accounts.
• Sale documents where it came from disposing of something: a property completion statement, a share sale agreement, a business sale.
• Inheritance or gift documentation: a grant of probate, a deed of gift, correspondence from an estate.

What consistently fails is a wallet that appears with a balance and nothing behind it. Not because anyone assumes the worst, but because there is nothing to write in the file.

The cases that are genuinely hard

Some perfectly legitimate histories are difficult to evidence, and it is worth knowing in advance if yours is one of them.

Assets bought long ago on a platform that no longer exists. Early purchases are the most common hard case. Exchanges close, accounts are deleted, and email confirmations from a decade ago are gone. What sometimes works: old bank statements showing the payment to the exchange, archived emails, and the on-chain history from the original address.

Mining. Rewards arrive from a protocol rather than a counterparty, so there is no invoice. Pool payout statements, wallet addresses used, electricity bills and hardware purchase receipts together build a picture. Solo mining from years ago is harder still.

Staking and yield. Similar shape: an on-chain trail exists but no document says what it was. Records of the initial stake and the platform statements are the usual starting point.

Airdrops and forks. Assets you did not buy and did not earn in an obvious sense. The on-chain record is the evidence, together with proof you controlled the qualifying address.

Peer-to-peer purchases. Assets bought from an individual, often paid in cash. This is the hardest, because the trail leaves the documented world entirely. Expect substantial scrutiny and be honest early; discovering it halfway through a review is worse than saying it at the start.

Gifts. A transfer from family is straightforward if it is documented and the giver can evidence their own source. It is difficult if the answer is that someone sent it and no one wrote anything down.

None of these makes a conversion impossible. All of them take longer, and all of them go better when raised at the beginning rather than surfaced by a question.

What to assemble before you start

Do this before you open an account, not when you are asked. The work is the same; the difference is whether it happens under time pressure with money in limbo.

1. Write the story in plain language first. Two paragraphs: how you acquired these assets, when, with what money, and what has happened to them since. If you cannot write it clearly, the documents will not save you.
2. Collect what supports each claim. Work backwards from the story and gather the record for each step.
3. Find the gaps yourself. Wherever the trail breaks, note it and decide what best substitutes. A known gap you can explain is far better than one discovered by a reviewer.
4. Get statements out of platforms while you still can. Exchange history is easy to export today and impossible if the account is closed.
5. Keep the wallet trail intact. Do not consolidate or move assets through new addresses to tidy them up before a conversion. It adds hops nobody can explain and makes the history harder to read, not easier.

That last point is worth emphasising. The instinct to make things look neat before an inspection tends to produce exactly the pattern that draws attention.

If the answer is that you cannot evidence it

Sometimes the records are genuinely gone. Being straightforward about that is better than the alternatives.

A provider may accept a partial picture supported by a signed declaration, or may limit the amount, or may decline. Declining is a legitimate outcome and not an accusation. What does real damage is an explanation that changes when questioned, because inconsistency is the specific thing reviewers are trained to notice.

Keep records from now on

The version of this problem you meet in five years depends on what you do this month. Export exchange statements yearly and store them somewhere outside the exchange. Keep a simple note of what you bought, when, and from where. Record the addresses you control.

None of it is difficult while it is current. All of it is nearly impossible to reconstruct later, and the same material is what your accountant will want anyway.

Where this fits with converting

Source of funds is one stage of a longer process. The full sequence, including how pricing works and where proceeds are allowed to settle, is covered in how to convert cryptocurrency to a bank account. If the amount is large enough that the venue matters, see also OTC or exchange.

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