The metonymous self

Why can people prove who they are with a legal document, but not prove who they are by being them? If we take a legal document to be the inscription of a legal fiction upon the world (the creation of a contrived state of being within an abstracted system or structuring reality), does that mean that any legal representation of identity is also a fiction? Furthermore, does that mean identity, in the sense of a legally binding one, itself is a fiction?

I postulate the existence of the metonymic person, a person whose very existence has been replaced by its own signifier, such that they no longer have existence outside the signifiers that represent this existence. Furthermore, I postulate that this is a very recent occurance.

This can be seen in obvious ways such as the number of places people are noted by an account number, or a driver’s license, or a federal ID number. But I think it goes deeper than that. I think people are becoming so subsumed under their signifiers that their signifiers are becoming more real than they are. This was a category of non-existence that was once reserved for nobility, but is now available, if not actively imposed, on every person dealing with modern society.

Perhaps it is a factor of consumption, our real selves must be consumed under a legal fiction of identity into order to create the mental state necessary for us to consume new, ready made, identities.

Of course as a fictional character that only represents myself, perhaps I trend in the other direction, a signifier without a signified becoming the thing signified by caveat. But I am not sure that derives from the first point.