We don't fully know yet. We do know that the IMF has the SDR (Special Drawing Rights - a basket of currencies) to deal with exchange between nations. We do know that the IMF has been experimenting with crypto currencies. There is a lot of talk that the currency will be backed by gold. However, nobody will actually own gold. Nobody will own anything other than these digital credits. Think of this new currency as a Gift Card rather than a currency. It's all about control.