Just a thought...
If it's possible to get a mobile game developer on board... (not that I know any)
GoldCoin could be hypothetically used as a "premium currency" in online Android/IOS gaming.
Mobile gamers pay real money for truly worthless "in-game" money across hundreds of game titles now.
I wonder if there's a way to make it viable (i.e. - at least as profitable as "fake" in-game money) for a developer to use GoldCoin instead. Easy to see where this would be a win for the gamer though, in game money spendable on a variety of games, across multiple developers/titles, and even usable for real world goods!