Address checks and AML

“Dirty” USDT: why an exchange blocks a deposit and how to avoid it

Updated 3 min read

In short

  • An exchange looks not only at your transfer but also at where the money came from before you.
  • If the coins’ history includes scam, sanctioned or stolen funds, the deposit may be held and explanations requested.
  • Checking the sender before the deal is cheaper than spending months proving you had nothing to do with it.

What “dirty” USDT is

The coins themselves are identical, but every transfer has a history. If USDT recently passed through an address labelled as scam, sanctioned, linked to the darknet or a theft, it is called “dirty”. The closer that address is to your transfer and the larger the share of funds from it, the higher the risk.

You may have honestly sold goods or exchanged money and still received such coins: a seller cannot see their history without a check.

Why an exchange blocks the deposit

Exchanges must screen incoming funds. Their compliance automatically assesses the transfer history and, if it sees links to risky addresses, holds the deposit until it is clarified.

Usually the exchange asks you to:

  • explain where the money came from and who you received it from;
  • show the chat, contract or receipt of the deal;
  • sometimes pass an enhanced identity check.

While the review runs, you cannot withdraw. This does not mean the money is lost, but the review can take weeks.

How not to receive such coins

  1. Check the sender’s address before the deal in GuardPay /check: risk labels, sanctions, links to known scam addresses.
  2. Do not accept money from third parties. The person you agreed with should pay; a transfer “from a friend” is a common sign of laundering.
  3. Keep evidence: the chat, the agreed amount, the transfer hash.
  4. Do not send large sums from new counterparties straight to an exchange. Check their history first.

More on deals in the P2P deal checklist and how to accept USDT for goods and services.

If the deposit is already held

Do not argue with support and do not send the funds again. Analyse the transfer in GuardPay /frozen-deposit: it shows what compliance could have seen in the coins’ history and prepares a letter with the facts for the exchange’s support.

Exchange blocked your deposit?

An on-chain breakdown of what the exchange’s compliance team saw in the transfer history, plus a ready letter with the facts for support.

Analyse the deposit

FAQ

Can I “clean” the coins myself by moving them through several of my own addresses?

No. The history stays on the blockchain, and extra hops between your own addresses look like an attempt to hide the trail and only increase suspicion.

Will the exchange return the money if I did nothing wrong?

Often yes, after reviewing documents. But the exchange decides, and the timing depends on it. The fuller your evidence that the deal was lawful, the faster the review.

This guide explains how schemes work and how to protect yourself. It is not legal or financial advice.

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