There's been a whole lot of these cryptocurrencies supposedly backed by something that all failed... I would look at this with a whole lot of skepticism. Check

There's been a whole lot of these cryptocurrencies supposedly backed by something that all failed... I would look at this with a whole lot of skepticism. Check here for a partial list of some of these coins: http://www.coinwarz.com/cryptocurrency http://www.coinwarz.com/cryptocurrency