scam -- not backed by anything but faith
A real national currency, if not backed by gold silver, is backed by the economy and military might and legal system of the issuer. This is backed by nothing, but "faith".
And also looking at the various exchanges there is a large gap, for example on one exchange now the bid/asked ( in $) is 115.5by 115.8, and on another it is 113.3.. By 113.3..--a potential instant profit on arbitrage--what is that all about??