Perhaps the checkmark could be issued to a specific hash of the username and display name. If any of those are changed obviously the issued cert would be inval

Perhaps the checkmark could be issued to a specific hash of the username and display name. If any of those are changed obviously the issued cert would be invalid. If they restore the information to match what the cert was issued for then it regains certification. But… what happens if an account is legally taken over by a new entity (say CNN buys the NYT or whatever)…