A wallet identifier, also known as a wallet ID, is like a username. You use it, along with your password, to log into your Blockchain wallet and access your digital assets. A wallet identifier is composed of 32 alphanumeric characters and 4 dashes, and takes the following format:
Every wallet has a unique identifier. When you create a wallet, a “Welcome” email containing your identifier will automatically be sent to the email address you signed up with. If you didn’t get the email or otherwise lost your identifier, this article describes how to retrieve your identifier and restore access to your funds. You can also find your wallet identifier within your wallet, under Settings > General.
If you ever need to use your 12-word recovery phrase to restore your funds, this action will create a new wallet that is an exact copy of your original one. This new wallet will have a new and unique identifier associated with it. Make sure to store this updated wallet information privately in a safe place. Never share it publicly or via direct message on any third party platforms like Twitter or Facebook.