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BRICS to launch independent financial system
(vovworld.vn)
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66% doesn't give you any more ability than 51% does. It doesn't change the speed, it just increases the cost. There would be no reason to hit 66% to do a 51% attack.
They who domiante block mining will dominate the chain. 66% is just an outright majority relatively. 51% vs 49% can be regained with enough luck.