I believe my similar idea to be more funny. Government mints a currency that can be used to pay taxes (for example 2024) It uses the currency to buy products

I believe my similar idea to be more funny. Government mints a currency that can be used to pay taxes (for example 2024) It uses the currency to buy products and services from the private sector. It will have a flexible exchange rate. You anticipate how much taxes you will have to pay and try to buy the currency cheaper than using the conventional coins. A forex market will happen based on economic activity, how much collective tax there will have to be paid. If there is a crisis there is likely to be more of the currency in circulation than the total sum of 2025 taxes. After the final tax day the currency is worthless.