I don't trust in cryptocurrency, but I believe in technology of a blockchain. I think that when the world understands it, we will receive global cryptocurrency. It won't be based costs of the electric power or other similar things
the digital coin of the future will be simpler, than a crypt
It will be more clear cryptocurrency. She will probably be created on the basis of a blockchain, but it will be much easier to understand how she is created as she works and as people can use her