Maybe not the national currency, but adopted as the official currency of the nation. At the time of this writing, El Salvador has stepped up and made the Leap. Bitcoin, the official currency of El Salvador. Not so much a leap of Faith, as this has been discussed for months and in some cases years.
Many countries are exploring and experimenting with Central Bank Digital Currency also known as crypto currency. China is using a digital yuan and Russia is rolling out the digital Ruble. The countries below have been polled and they responded as to their adoption or use of crypto.