If I can print a cyberspace stamp that only I have the authority to print, then I can print something that, as a matter of the necessities of legal theory, looks a lot like money or postal stamps. Labels can provide the address on the message, and the return address on the message, the postage stamp on a message, the cancel stamp on the postage. But Labels are not restricted to just these types. Think about messages with possibly many different stamps. Dream about stamps in the cyberspace of tomorrow.
Labels are globally unique, but any authority can produce new Labels without asking permission.
Labels achieve this seeming impossibility by the principle of successive authority. Parents name their children. Among Labels, there would be no other John Smith in the world, but the Smiths would not have to consult any other authority in order to name a son John. Like the name John Smith, a Label has its family name and name within the family, but unlike John Smith, our Label explicitly states all its authorities back to a global root, and, because of this, it is guaranteed to be globally unique. An authority can create new and unique Labels by appending more Label information to the Label he now has.