As I can remember, there is a country that tried to make their own digital currency. I do not know what really happened but I think that is not released. Countries will be making their own crypto currency since it is the future of money. In the future we can see digital currencies used by almost all of the people in the world not as an asset but as a common currency.
I believe it is China. I saw a news saying that the Chinese government are banning all cryptos in China and they are developing their own state issue cryptos in order to have a overall control over the transaction and maybe even tax on it.