1. Be cautious when trading USDT in the cryptocurrency circle, and don't be greedy for high prices. High prices often mean black funds and there is a risk of frozen accounts.

2. It is best to find reputable merchants for large-scale USDT transactions, but even so, they may be frozen. The continuous collapse of Shield merchants last year is a lesson.

3. In addition to Ouyi and Binance, other trading platforms have higher risk factors, especially Yibifu and EB, which often have bosses who launder money through online gambling.

4. Preventing frozen accounts and black and gray funds is an issue that everyone in the cryptocurrency circle must pay attention to. This may be the most important and last lesson.

In general, be cautious and cautious when trading in the cryptocurrency circle, and don't be easily tempted by high prices and informal channels. Protecting the safety of your assets is the most critical.