South Korean police have arrested 23 people tied to an alleged USDT laundering operation worth $11.1 million, according to a The Block report.
The core mechanic is simple. From February 2024 to April 2025, the group allegedly moved illegal funds by purchasing Tether’s USDT and then trading it on exchanges. The reported activity covered about a year and a bit, which matters because laundering schemes often rely on volume and repeated routing, not one-off transfers.
This is not a claim that USDT itself is “the problem.” It’s an indictment of how an asset built for fast settlement can also be used to move money quietly between steps. In practice, investigators are treating USDT purchases and exchange trading as the bridge between illicit funds and a structure that looks like ordinary market activity.
What the report says they did
The Block frames the alleged process as two legs.
First, the group allegedly acquired value by buying USDT. Second, it allegedly converted and re-routed that USDT by trading on exchanges.
That combination is a classic laundering pattern. It turns a clean digital unit into a transferable balance that can be split, timed, or re-expressed through exchange activity.
Why USDT shows up in cases like this
USDT is designed to trade easily across venues. For laundering investigations, that ease becomes both a tool and a trail.
The trail is not magic. It depends on how exchanges handle deposits, withdrawals, and transaction records, and whether investigators can link on-chain movements to off-chain identities. But the basic logic is why The Block’s report keeps circling back to USDT and exchange trading. If someone is trying to obscure origin while maintaining liquidity, a stablecoin priced to fiat can help them keep the signal steady while the routing changes.
The risk is in the routing, not the token
The key risk point is the human workflow around the asset. Buying USDT is not inherently suspicious. Trading on exchanges is not inherently suspicious. The problem is the intent and the use of that liquidity for concealment.
Under stress, these operations often fail at the edges. That can be an account relationship that breaks compliance rules, an operator who gets sloppy with identities, or a routing choice that creates a link investigators can follow.
The Block’s report does not add more detail than the alleged flow size and the Feb 2024 to Apr 2025 window. So readers should resist the urge to overfill the gaps. The only defensible takeaway here is that authorities believe the group treated USDT and exchange trading as the laundering mechanism.
What to watch next
Arrests are the headline. The follow-up is usually where these cases get more revealing. Look for whether prosecutors tie exchange accounts to the arrested individuals and whether they describe the specific transaction patterns investigators used to show intent.
With stablecoin-linked laundering, the next steps often turn on evidence that can connect “trading activity” to “moving illicit proceeds.” That is the difference between a market story and a criminal one.
| Item | What The Block reported |
|---|---|
| Time window | Feb 2024 to Apr 2025 |
| Alleged amount | $11.1 million |
| Alleged method | Purchased USDT and traded on exchanges |
| People arrested | 23 individuals |