I dont think it would be hard to argue, legitimately, that if bitcoin is backed by anything, it IS math.
What the hell do you think SHA256 is? Reading Comprehension (haha i guess it is sorta)? Woodshop? Nope, Its definitely math.
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
Additionally, I think it is safe to say that the state is backing a currency if they are allowing debts to be paid using it.