So the BRICS nations aren't going to create their own currency like the EU did. Each country will keep their currency for everyday transactions by consumers. However, their commodity purchases will all be done in a single digital currency.
This digital currency will be pegged to the weight of gold. They're not trying to replace the dollar, at least not yet, they're trying to piggyback on it and let the dollar do all the work.
Because these nations will no longer be purchasing U.S. bonds or treasuries, it will fall on the large banks and Federal Reserve to buy them. This will explode the Feds balance sheet so they may even require pensions to buy bonds, which will be a disaster long term.
This plan has been in the making for 17 years but was accelerated when the Biden regime froze the assets of the Russian Central Bank. Essentially, the U.S.. weaponized the dollar and it scared the hell out of the rest of the world.
The reason Janet Yellen was recently in China is to bully them not to continue down this road. They gave her the finger. Not to be outdone, Victoria Nuland, who's responsible for U.S. involvement of the war in Ukraine, will be heading to South Africa just days before the BRICS nations meet there where she will threaten them as well. She'll get the same response Yellen got.