Someone else transferred it to me 1.2 million. How does the bank check whether it is illegal?

1. verify the identity of the transferor: first, verify the identity of the transferor to ensure that it is a legal transferor. It can be verified by looking at the ID card or other documents of the transferor.

2. Check the transfer purpose: you need to check whether the transfer purpose of the transferor is legal, such as whether it involves illegal transactions, money laundering, etc.

3. Consult the bank: you can consult the bank about the legality of the transfer, and the bank can check it according to the transfer records and relevant regulations.