I can guess how the Bretton Woods 3.0 will work. Central banks will have accounts with each other, and hold gold. Since some currencies are more useful than others to buy stuff, e.g. the Yen is best to buy MRI scanners, so governments will prefer such currencies over others. Since bond markets of most countries are not open to foreign governments, currencies of governments with undesirable currencies will immediately be converted to gold, and the physical gold can be shipped from around the world from various ports which cannot all be naval blockaded at the same time. These countries exporting gold this way will have to sell undesirable currencies they accumulate for commonly desired goods like oil, which can also be warehoused. The only way for governments to do deficit spending will be via devaluing their currency against gold.

The problem until now was that Bretton Woods 1.0 had a fixed USD price of gold which couldnt be honored because of deficit spending of USA, and so USA allowed foreign governments to hold US government bonds instead since 1970 until now and this was Bretton Woods 2.0

Now even the bonds are worthless thanks to high rates and it is unlikely USA can pay back the debt without devaluing the USD and thereby exporting inflation to other countries if other countries try to devaluing in sync.

Bretton Woods 1.0 had another problem which was that USD could only be converted to physical gold via sending ships to USA which was a geopolitical risk.

Bretton Woods 2.0 had another problem that no other countries were willing to run the deficits needed to generate enough bonds to be sold to foreign governments.

This is why the now being evolved Bretton Woods 3.0 in BRICS and ASEAN allows floating price of gold wrt every currency, gold withdrawals from many ports around the world, central banks having accounts with each other but instead of immediately buying US government debt central banks will convert undesirable currencies to gold immediately.