Except that even if you use your own paper currency, you have to pay taxes in your country's oficial currency. Taxes are usually a significant amount of every t

Except that even if you use your own paper currency, you have to pay taxes in your country's oficial currency. Taxes are usually a significant amount of every transaction. So, the new system will very quickly bleed out. Because of that and other reasons, it is in practice impossible to make your own paper currency.