On 15 September, the ethereum blockchain is planning to switch off its mining rigs. If it happens, it should reduce the carbon emissions of the entire ethereum ecosystem by orders of magnitude overnight, leaving bitcoin as the only major cryptocurrency to be built on the destructive proof-of-work concept. But the switchover could also throw some of the largest institutions in the sector into chaos, and seems likely to evolve into a cold war between the new version of ethereum and the diehard…
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