Mr Bojangles:
The bank appears to exist as a part of the Repulic of Dakota nation. www.republicoflakota.com
It's a separatist movement in the upper mid-west lead by Russell Means and the Lakota nation. They base their claim to an independent nation from within the power of the Fort Laramie treaty of the 19th century they say the current government violated. As far as they are concerned they are an independent nation, but the U.S. still dosen't recognize them and undoubtably is just waiting for the "Republic" to infringe on some law so they can send the "gun in the room" in to put a stop to them.
I would actually be willing to bet the coin is being used in the area of the Lakota Republic. It's most likely their steps towards an independant economy from the U.S.'s and might I say if it is a truly competetivie currency it would perform interestingly in the wake of a fiat based bebacle--much like the current one. The enemy of hyper-inflation is a stable competitive alternative currency or means of trade. I would doubt you even pay taxes on these deposits.....alas I doubt the movement is going to be long lasting.
They have quotes from Ayn Rand on their website, and appear to not be making obvious philosophical blunders. More power to them. It seems sad to me that G. Edward Griffin's Freedom Force is not showing them some support, although I think his technical position is "Wait and see if 'they'(Russell Means) stop(s) asking the UN for help in resisting tyranny". Interesting times.
"In the Spirit of Crazy Horse" by Peter Matthiessen was one of the first books I read in Highschool that turned me against the USSA. I recommend it, but the details are fuzzy.