It's probably not going to happen, but interesting to note that it is being discussed and presumably studied as a serious possibility:
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Dmitriev said the five BRICS nations had also discussed creating a common cryptocurrency for mutual payments as the grouping was reducing the share of payments in the U.S. dollar.
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Still don't particularly agree/understand how the crypto will eventuate to real work use but I holding one just in case anything crazy happens. I guess it has a large potential upside and if It goes to zero it's written off as a learning experience.