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Whitney Webb: \Proof-of-stake (PoS) underlies Ethereum's consensus mechanism. Ethereum switched on its proof-of-stake mechanism in because it is more secure. The second-most-popular crypto platform transitioned to proof of stake, an energy-efficient framework for adding new blocks of transactions. What Is Ethereum Proof-of-Stake? � Ethereum officially switched to a Proof of Stake (PoS) consensus mechanism in as a more secure and.