Not sure what the interest would be, but it would not be difficult to make a cryptocurrency betting pool.
Basically this is just a small program that takes in deposits in cryptocurrency, determines the outcome of the fight by looking at web sites, then distributes the winnings. Once launched, everyone can see the program's code, no one can change or stop the code, and anyone can deposit into the program completely anonymously. So basically you can bet anonymously while being absolutely guaranteed that winnings will be distributed according to the rules of the program. It's a pretty nice way to bet, without big online sport books juicing the odds and changing the rules whenever it suits them.
But the question is do people here even use cryptocurrency or would be interested in using it to bet on MMA?