Source of funds is a record, not a balance.

The transaction is only one part.

A transaction can show movement between addresses. It does not, by itself, explain the activity that produced the money, the person entitled to it, or the documents behind the acquisition. A screenshot of a balance answers an even narrower question.

Think of a source-of-funds file as a chain of evidence that a person unfamiliar with your history can follow. The goal is a coherent account supported by records. The goal is not to reveal more information than the recipient needs or to hand over control of a wallet.

A gap should be named before someone else has to find it.

Build the chronology before the narrative.

Start with a timeline. Identify the original source, the acquisition, subsequent transfers, and the funds intended for the transaction under review. Keep the underlying records separate from your explanation so another reader can inspect both.

Depending on what happened, the useful records might include an employment record, a contract and invoice, an exchange export, a dated purchase record, or transaction identifiers. This is a working inventory, not a universal checklist. Ask the receiving institution which evidence it requires and in what form.

The Financial Action Task Force identifies source of funds or wealth and unusual transaction patterns among the indicators relevant to virtual-asset risk assessment. Its report is a reason to prepare an intelligible record, not a prediction that one document will secure approval.

Label the gaps.

Older holdings may have incomplete records. An exchange may have closed, an export may cover only part of the period, or the explanation for a transfer may be clearer than the surviving documentation. Do not manufacture continuity.

Separate what the records establish, what you remember, and what remains unknown. Identify possible corroboration and ask whether the reviewer will accept it. A gap should be named before someone else has to find it.

Keep originals unchanged. If you create a summary, retain its relationship to the original files and explain any calculations. Quietly editing a document to make it easier to read creates a new problem where the file needed clarity.

Keep custody out of the evidence request.

Decide how sensitive material will travel before sending it. Confirm the recipient, the secure channel, the requested fields, and the retention terms. A general website form is not the place for identity documents or a financial archive.

Never send private keys or seed phrases as evidence. If proof of control is requested, ask the responsible professional or institution for a method that does not transfer spending authority, then assess that method before proceeding.