Without a group, you definitely cannot claim sovereignty over communication infrastructure in this day and age. I have zero faith in one individual's ability to BOTH assassinate the president AND keep a server online indefinitely. I also can't think of any other possibilities where one of the other possible ways to exert sovereignty would be compatible with keeping a server online for one person. If you're only one person, you must just be using the shared communication infrastructure that belongs to everyone, where everyone needs help overthrowing the saboteurs running it.