Fiat currency remittances encountering bank review is usually because banks and financial institutions must comply with various regulations and compliance requirements, with the main purpose of preventing money laundering, terrorism financing, and other illegal activities.

1、Here are common reasons for bank review:

2、Anti-Money Laundering (AML) Regulations: Banks check the source, amount, and counterparty of remittances to ensure funds are not used for money laundering activities. Large remittances or funds from unknown sources are more likely to trigger review.

3、Know Your Customer (KYC) Procedures: Banks need to confirm customer identity and understand their transaction background. This includes verifying the identity information of remitters and recipients, especially for new or unusual transactions.

4、Large Remittances or Frequent Transactions: Remittances exceeding certain amounts may trigger banks' automatic review systems, especially for cross-border remittances. Accounts frequently making large transactions will also be monitored.

5、Suspicious Transaction Behavior: If remittance activities do not match account history, or are inconsistent with the customer's financial background, banks may conduct additional review of such transactions.

6、Sanctions and Blacklisted Countries: If remittances involve sanctioned countries or individuals, banks will block or further investigate according to international regulations (such as OFAC sanctions list).

Unclear Source of Funds: Banks may require remitters to provide proof of legitimate source of funds, especially when the amount is large.

7、Intermediary Banks or Cross-border Transactions: Cross-border remittances may involve multiple banks, and intermediary banks' review procedures may also cause delays or require additional information.

These review measures are to ensure the security of the banking system and comply with international and domestic laws and regulations.