The idea is very interesting and progressive. Some countries are discussing this issue. But I have some doubts about this. The government disposes of our taxes at its discretion. They certainly take an annual budget, etc. But we can not trust it.
If the country goes over to the official cryptocurrency, then most likely the transactions will be available for viewing to any person. If the money goes not to health care but to the military sector, it will be impossible to hide it. And do you think that at least some government will agree to this? It is necessary to remake the entire economy in the country, and this is the colossal expenditure of money and labor. I don't think that the countries are ready for this.
Venezuela in this case is an instructive example for future.