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so a sovereign cryptocurrency, say for example, created by australia, to replace the national currency?

that would be a lot more manageable - except the government would never want to give out that kind of transparency :)

and they would lose central bank functionality, which is pretty much just based on issuing new currency government bonds

and the value of the crypto dollar would then actually be real, dependent on how much supply demand there is - which is again something the government wouldn't want.

yes.. I got 99 problems, 98 of them are middlemen.

which leads us to the next reason it will never happen. The government has no motivation - they like the way things are now.

They'd only do something this as a reactionary measure when crypto starts to take over - and by then it would be too late.