Neither Yuan, nor Ruble, nor gold, nor Bitcoin can be a "reserve currency" for the BRICS digital currency, as I've explained in the comment above. You could ma

Neither Yuan, nor Ruble, nor gold, nor Bitcoin can be a "reserve currency" for the BRICS digital currency, as I've explained in the comment above. You could make an argument for the BRICS currency becoming a reserve currency, but not for it having an internal "reserve currency". One of the main goals of the BRICS is to allow the member countries to trade in their own local currency, which contradicts the idea of existence of a "reserve currency for BRICS".