Recently, a friend lost their wallet QR code due to negligence, and this issue needs to be taken seriously. If you are using a custodial wallet from a major exchange, especially remember the following points.

**QR code backup is the first step**—immediately save it properly after registration, don't wait until problems arise to regret it. Many people don't realize the importance of the QR code and only find out when they need it, which can be very troublesome at that time.

**Check before uninstalling the app**—before you want to uninstall the app, make sure the wallet has been fully backed up. Open the settings area in the top left corner of the wallet and ensure all recovery information has been properly stored. This is a key step to prevent data loss.

**Understand the dual protection mechanism**—custodial wallets usually use a two-factor authentication scheme with a QR code and a password. The QR code is one layer of protection, and the password is another. Many users are careless during registration and do not pay attention to where the password is stored, which poses security risks. The password should be recorded separately in a secure place and not stored together with the QR code.

If you use this combination well, your asset security level can be greatly improved.