I just saw some really important gamertag on the chat, is that really them?
Due to the way the chat works, we allow you up to one minute to prove who you are before forcefully changing the nickname you’re using. During that time it is quite possible for somebody to impersonate another user, so the only way to be absolutely certain that a person is who they say they are is by typing “/ns status gamertag” where gamertag is the gamertag of the person you want to check. If NickServ messages you back with the status of “3” then the person has verified their identity, otherwise you should view the person in question with skeptecism. You will only see Major Nelson with the nickname of Major_Nelson.