Native American tribes adopt Bitcoin-like currency: MazaCoin

With lots of altcoins popping up, it's interesting to see one being used by the sovereign nation of the Lakato tribe. Since being established only a month ago, it's already one of the top 20 crypto currencies and has a market cap of over $5m and growing. It seems like this cryptocoin is already seeing some serious traction. Is the US govt going to embrace this or fight it?