US Patent 10887764 Audio verification

Techniques for enabling a system to verify that contact data are to be added to a user account are described. A system receives message data. The system generates first audio data that includes a representation of a verification code. The system sends a message comprising the audio data to a first device. The system receives, from a second device, second audio data that represents the first audio data. The system confirms that the second audio data included a representation of the verification code, and then verifies that the contact data is to be added to the user account.