Pay attention to a few points, which can effectively prevent the card from being frozen when collecting black money. (1) For over-the-counter transactions, try to choose major platforms such as Binance and Ouyi. These platforms have good communication channels and risk control methods with mainland regulatory agencies and law enforcement agencies. (2) Try to choose an OTC platform that supports T+1/T+2 withdrawal strategy. Although the cash cannot be withdrawn immediately after the coin sale, it reduces the risk of suspected money laundering through OTC transactions. For example, trade Binance T+1 and Huobi Select (compared to free trading and T+2 withdrawal). (3) Avoid directly using stablecoins such as USDT for OTC transactions, and try to use mainstream currencies such as BTC and ETH for OTC transactions. (4) The bank card used for OTC transactions must be an independent card and is not used for normal use, so it is separate from the salary card, so that even if it is frozen, it will not affect the use of other funds. Investigate, it's easy to explain cash flow. (5) For bank cards used in OTC transactions, local bank cards should be used as much as possible, such as urban commercial banks and rural commercial banks in many places. Since large and medium-sized commercial banks and joint-stock banks like Industrial and Peasant China Construction Bank have branches all over the country, law enforcement agencies can basically freeze them directly. (6) Do not conduct regular transactions with ordinary merchants or ordinary users. If the same user makes more than three indirect purchases in a day, or sells after a few hours of purchase, it is suspected of money laundering, which is very dangerous. (7) Find reliable OTC sellers for transactions. Try to actively accept orders from large traders and market makers, place fewer orders, and avoid merchants in problem areas. In fact, as an ordinary user, it is difficult to distinguish which traders are trustworthy. For example, a large number of friends who deal with Huobi Blue Shield service merchants have also been frozen. (8) Reduce the frequency of withdrawals and increase the amount of cash. (9) After the OTC transaction is completed, please do not change it to another bank card of your own to avoid contaminating other funds and causing trouble for cooperating with the investigation. If you need money urgently, you can withdraw cash from an ATM or spend money online. (10) Try to choose working days to receive cash. It is best to choose to trade during normal working hours like weekdays, such as withdrawing coins from 9:00 am to 9:00 pm. (11) Please do not transfer money immediately after receiving the payment. After selling USDT into RMB, do not transfer it out immediately. It should be kept in the account for a period of time.The above are some measures to avoid being frozen by bank risk control. So what should you do if unfortunately your funds are frozen? How do we explain the card being blocked to prove we are not involved in money laundering? (1) Individuals who are involved in normal Bitcoin transactions and have nothing to do with money laundering and other transactions; (2) Do not know that the proceeds from the sale of coins are suspected of crimes; (3) Cooperate and provide all transaction records, chat records, chain transfer records, etc.; ( 4) You must be very clear that your trading of digital assets will not be illegal. In over-the-counter transactions, the bank card used to withdraw funds is frozen by the police and the judicial system. What documents will the other party require the individual to provide to unblock it? The common information provided mainly includes: complete transaction records, such as bank card transactions, on-chain transaction records, order records on the trading platform, WeChat chat records (including the content of the communication process), and other evidence that can prove the legitimacy of the transaction. Property, even proof of income, etc.