This article explains what Proof of Source of Funds (POSOF) means, why KAST may request it, what documents are accepted, and how to submit them. It also answers common questions and provides guidance to help your verification go smoothly.
What Is Proof of Source of Funds?
Proof of Source of Funds (POSOF) is documentation that shows where the money you use on KAST comes from. It helps confirm that your funds are legitimate, traceable, and compliant with financial regulations.
SOF relates to the origin of your money, not your identity or address. Examples include salaries, business income, investments, savings, or asset sales.
Why Do I Need To Provide My Proof of Source of Funds?
KAST is required by Global financial regulations to verify that the funds moving through our platform are lawful and transparent. Providing POSOF helps KAST:
- Comply with anti-money laundering (AML) requirements
- Prevent fraud and financial crime
- Understand the typical activity expected on your account
- Keep your wallet safe from misuse
What Documents Can I Submit As My Proof of Source of Funds?
You can submit any document that clearly shows how you earn or receive your money. Proof of Source of Funds (POSOF), should explain where your money comes from and reasonably match the source, amount, and activity described in your questionnaire or KAST request.
Below are accepted types:
A. Employment Income
- Recent payslip(s) (less than 6 months)
- Employment contract
- HR letter confirming salary
- Bank statement showing salary deposits
B. Freelance or Contractor Income
- Invoices to clients
- Bank statements showing client payments
- Tax declarations with business activity proof
C. Business Owner, Self-Employed, or Company Profit
- Business bank statements
- Invoices + corresponding deposits
- Tax filings showing business revenue
- Company registration + proof of revenue
- Company registration or incorporation documents
- Proof of ownership, such as a share certificate or register
- Audited financial statements or recent revenue reports
- Proof of dividend income
D. Crypto Trading
- Exchange account statement showing deposits, trades, and withdrawals
- Wallet ownership evidence and transaction history
- Blockchain explorer links matching deposits
- Tax filings showing crypto income or capital gains
E. Investments
- Brokerage account statements
- Dividend statements
- Capital gains report or tax return
- Trade history with timeline evidence
F. Savings
- Bank statements showing accumulation over time
- Fixed-deposit certificates
- Employment history or tax filings, if needed for additional context
G. Loan
- Signed loan agreement
- Bank transfer confirmation showing loan disbursement
- Lender ID and declaration, if the loan is peer-to-peer or informal
H. Property or Asset Sale
- Signed sale agreement or contract
- Payment receipt or bank/escrow evidence of payment
- Title deed, property registration, or proof of ownership
- Lawyer or agent confirmation letter, if available
I. Company Sale
- Share purchase agreement
- Bank statement showing proceeds
- Company registry showing transfer of shares
J. Gifts or Inheritance
- Gift letter or declaration from the sender, if applicable
- Bank statement showing incoming transfer
- Legal will, probate, estate, or executor documents for inheritance
K. Student, Family Allowance, or Scholarship
- Bank statement showing family allowance or scholarship
- Proof of student status, such as an enrollment letter or student ID
Digital Account Statements
Statements from Wise, Deel, PayPal, Revolut, crypto exchanges, or similar platforms may be accepted if they clearly show the source of funds. KAST may request supporting documents, such as a traditional bank statement, to verify where the money originally came from.
Document Requirements
- Must show your full legal name
- Must show dates (typically within the last 3 months or the most recent version available)
- Payslips should be recent (less than 6 months)
- Must clearly show a legitimate source of funds
- Must reasonably match your questionnaire or KAST request
- Must be clear, readable, uncropped, and unedited
- Screenshots or pictures of a screen are not accepted
Do Digital Account Statements Count as Proof of Source of Funds?
Statements from digital financial platforms (such as Wise, Deel, PayPal, Revolut, and similar services) are commonly used today, but they may require supporting documentation depending on the information shown on the statement.
If needed, you may be asked to provide a supporting statement from a traditional bank account that:
- Shows incoming funds or salary deposits
- Displays a positive, active balance
- Confirms that the digital account is funded by a verifiable financial source
This additional documentation helps KAST clearly verify where your funds originate, which is required under KYC and AML regulations.
Digital platform statements alone may be insufficient if they lack complete account details, do not show clear funding history, or cannot verify the origin of the money being used on KAST.
How Do I Submit My Proof of Source of Funds on KAST?
If KAST requests POSOF, you’ll receive a prompt in the app.
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What Happens After I Submit My Documents?
Once you submit your POSOF:
- Your documents are reviewed by our compliance team
- You may be contacted for clarification
- Upon approval, no further action is required
Most reviews are completed within 1–3 business days.
Why Was My Proof of Source of Funds Rejected?
A submission can be rejected for common reasons:
- Document is too blurry or cropped
- Name does not match the KAST account
- Date is missing or too old
- Document does not clearly show the flow of funds
- Screenshot is incomplete
- Uploaded file is edited or altered
- The document type does not match your stated income source
Frequently Asked Questions
Do I need to submit POSOF every time?
No, you only need to submit POSOF when KAST requests it. This typically happens for compliance reasons or when your activity reaches certain thresholds.
Can I use the same document for multiple purposes?
Yes, you can reuse a document as long as it clearly shows your source of funds. It must still meet all verification requirements at the time of submission.
Do screenshots count?
No. Screenshots are not accepted for POSOF or POA verification. Documents must be a clear photo of the original document (or a full scan), showing all required details.
What if I don’t have documents in my name?
You may need to provide additional explanation or alternative supporting documents. The Concierge team will help you determine what is acceptable.
Is my information secure?
Yes, your documents are encrypted and handled according to strict data-protection standards. Only authorized compliance personnel can access them.
Will you share my information with external sources?
No, KAST does not share your POSOF documents with external parties except where required by law or regulation, or with service providers acting on our behalf to support verification and compliance checks. Your information is used solely for verification and compliance purposes.
What if my income varies month to month?
You can submit multiple statements that show a typical pattern of your earnings. This helps provide a clearer picture of your financial activity.
Do crypto profits count as a proof of source of funds?
Crypto-related funds may be accepted, subject to review. You’ll typically need to provide transaction history showing how the crypto was obtained and how the funds reached you (for example, exchange statements and/or wallet histories).
What happens if I don’t provide POSOF?
Your account may experience temporary limitations until verification is completed. These restrictions are removed once acceptable documentation is submitted.
Do I only need to submit one document?
In many cases, one clear document is enough as long as it fully explains the source of your funds. If your financial situation is more complex, you may be asked to submit more than one document for clarity.
Which document should I pick to submit?
Choose the document that best represents how you primarily earn or receive your money. If you have multiple income sources, submit the clearest and most complete documentation first, and the team will request more only if needed.