# Sign intents

Every system change request must include a digital signature. Whenever you submit an intent for approval, approve an intent, or reject an intent, you need to sign the intent with the **Ripple Custody: Auth & Sign** app.

## Prerequisites

To sign an intent, you need access to the **Ripple Custody: Auth & Sign** app on your mobile device.

## Sign an intent

To sign an intent:

1. With the app, scan the QR code displayed in the UI:
![Authenticator signing intent update](/assets/sign-app.045ca52ac0bda7003867003c94e53b0dd72db26aca46b76934e768977e778707.7d10b72f.png)
2. In the Signature requested window:
  1. Review the information displayed in the app in the **Intent details** and **Raw details** sections. This example shows a prompt to sign a request to create a new domain:
![Authenticator signing intent update](/assets/sign-app2.44ff608541763547505740b3b2d452f8761062abbe8e7c63e1226f5ff56460be.7d10b72f.png)
2. Select **Sign**.


Result
The Ripple Custody UI shows a success message if the signature was successful and an error message if the signature was unsuccessful.

If the signature was successful, you can now check the progress of your intent, as described in [Check updates](/products/custody/v1.26/ui/get-started/key-operations/check).