If public debt is caused by the creation of money by the bank, if the BTC is affirmed, bank could not give money that doesn exist right?
Firs the money are not created (stamped) by the (commercial) bank (as you mean) but by the Central Bank of every country (or the Authority which have such role in the given country).
If bitcoin will be regulated and being legal (meaning affirmed by you) that's will be good for him in that country. Will be more easily spread and used in that country. But that's all. Bitcoin cannot be used as national currency of no one country for to many reasons. Firs of all because it is owned by it. Second because is decentralized and cannot be controlled only by that (one) country. The are even other factors which cannot allow such adoption. But if it will be possible to be national currency of some country and will be managed right the answer would be that the problems with the overproduction (stamped) money in that country will be much more few.
