In China, the main reasons why C2C withdrawals in the cryptocurrency field are blocked are as follows: $BTC $ETH $USDC

* Violation of relevant laws and regulations: China has not yet issued clear laws and regulations for cryptocurrency, but there are still some relevant regulations and policies. For example, the "Announcement on Preventing the Risks of Bitcoin and Other Virtual Currency Transactions" issued by the People's Bank of China and other five ministries and commissions in 2017 clearly stated that financial institutions and payment institutions are not allowed to conduct virtual currency transactions such as Bitcoin. If C2C withdrawal transactions involve violations of relevant laws and regulations, such as money laundering, fraud, etc., the bank card may be frozen.

* Misjudgment by bank risk control systems: Due to certain risks in cryptocurrency transactions, the risk control systems of some banks may identify C2C withdrawal transactions as suspicious transactions and freeze related bank cards. This situation is usually caused by large transaction amounts, abnormal transaction frequency, etc.

* Problems with the exchange or merchant: If there are problems with the C2C exchange or the merchant itself, such as being included in a regulatory blacklist, the bank cards related to it may also be frozen.

In order to avoid being blocked when withdrawing money through C2C, it is recommended that you pay attention to the following points:

* Comply with relevant laws and regulations: When conducting C2C transactions, you should abide by relevant laws and regulations and avoid engaging in illegal activities such as money laundering and fraud.

* Pay attention to the transaction amount and frequency: When conducting C2C transactions, you should pay attention to the transaction amount and frequency to avoid excessive single transaction amounts or excessive transaction frequency.

* Keep transaction vouchers: When conducting C2C transactions, transaction vouchers, such as transfer records, chat records, etc., should be kept so that they can be provided to banks or relevant departments when necessary.

If your card is unfortunately frozen, you can first try to contact the card-issuing bank to understand the situation and provide relevant materials according to the bank's prompts. If the problem still cannot be solved, you can complain to the relevant departments or seek legal help.