Have a 48 hour delay before changing it that communicates with the emails on the account to let them know the change was being made. Use any number of electronic tracking methods for tracking and verification. Use a phone number or two-factor authentication to verify the authenticity of a user’s account. Use an electronic tracking method to track and verify the user’s device. Use the phone number on a set phone number to verify. Use a number of other tracking methods to verify and track the device. Use the number you need to log in.”]
Source: https://gizmodo.com/amazon-says-it-closed-its-glaring-authentication-hack-e-5932600