It isn't only promising, it's also dangerous direction. As I understand, gold mining is income source for large companies in the industry. On the one side, Goldea will be too small at first stages, so they won't pay attention on tiny fish. But Goldea will grew and new problems will appear.
This applies to any business. As soon as there are significant volumes, there will be problems. No one wants an additional competition. This must be taken into account immediately.
Perhaps here you are right, but many of these problems will help to solve the technology of decentralization.