By ozgurdonmaz / Getty Images Senior figures in the crypto world said on Thursday that one of the biggest software upgrades the sector has ever seen was completed, an overhaul of the Ethereum blockchain aimed at reducing its massive energy consumption. Senior figures in the crypto world said on Thursday that one of the biggest software upgrades the sector has ever seen was completed, an overhaul of the Ethereum blockchain aimed at reducing its massive energy consumption. Developers had spent years working on a more energy-efficient version of Ethereum, a digital ledger that underpins a multibi…

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