If you need to prove that you have conducted fund transactions in CCB, you can issue a transaction certificate through the following steps: 1. Go to the CCB website or mobile APP and log in to the account. 2. Click "Assets" in the menu and select "Funds" to find the historical transaction records. 3. Find the transaction record that needs authentication and click "Certificate Download". 4. After downloading the file, you can print it out on the computer or copy it to a USB flash drive, and apply for a paper certificate at any CCB outlet. Remember to bring your valid ID! If you have any questions, you can go to the nearby CCB consulting counter, and the staff will answer your questions truthfully. I wish you a smooth application!