I just saw someone on the forum talking about “black U,” and I don’t think their understanding is quite right. Let me sort this out.

First, let’s talk about what USDT is. USDT is issued by Tether, and it’s a stablecoin designed to maintain a 1:1 value peg to the US dollar. Everyone should know this.

So what is “black U”? Simply put, it’s USDT obtained through unofficial channels, which may involve illegal sources such as money laundering, hacker activity, and other unlawful origins. Due to regulatory restrictions in certain regions, this kind of USDT circulates in unofficial markets.

Here’s the key question: will Tether flag “black U” addresses? The answer is yes. Once an address is added to the blacklist, the USDT on that address is completely frozen—so it can’t be transferred out at all. This is Tether’s way of preventing funds from continuing to move.

Can “black U” be transferred to an exchange? This depends on two scenarios. If you transfer it to an exchange before the address is blacklisted, and it’s later discovered to be “black U,” the exchange will freeze your account and funds. Why? Because legitimate exchanges all have to comply with regulatory requirements and use systems to detect transactions from blacklisted addresses. Even more seriously, if the police become involved, the exchange will cooperate by providing your information.

There’s an important point here: every transaction on the blockchain has a complete record. Even if you transfer “black U,” it can ultimately be traced to where it went. So don’t think you can hide it.

Many people now want to buy “black U” at a low price through certain small platforms. I can only say that this idea is very dangerous. First, there are no legitimate channels to sell “black U.” Second, once you’re discovered, you’ll face legal consequences. Instead of doing that, it’s better to hold some mainstream assets steadily and accumulate value over time—that’s the real long-term path.