The Mazacoin founding press release stated that Mazacoin was "commissioned by the Oglala Lakota Nation" with the task of creating for them "the first ever Sovereign National Crypto-Currency." Now some people have claimed that Mazacoin was claimed to be an "official" currency of the Oglala Lakota Nation. But there is a clear difference between a currency being commissioned to be created, and it being officially adopted. The former would mean the Oglala Lakota Nation looked upon the currency with approval, the latter would mean the currency was legally adopted. But nowhere was it claim by the founder of Mazacoin that Mazacoin was a legally adopted currency of the Lakota. In fact there was a written document that was an agreement between Payu Harris and David Mills, of the Oglala Sioux Office of Economic Development. The agreement can be downloaded here:

http://cryptominers.freeforums.org/the-memorandum-of-understanding-t10.html

http://www.oglalalakotanation.org/oln/PROGRAMS_-_SERVICES.html 

Now even though mazacoin is not the official currency of the Lakota, this evidence shows the agreement between Harris and officials of the Lakota Nation that established mazacoin as a currency. This is not as amazing or news-breaking as "official currency of the Lakota Nation" but it's still a ground-breaking move in crypto-currency.