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Downsides of Proof-of-Work and Proof-of-Stake, explained

Proof-of-Work and Proof-of-Stake are arguably the best-known consensus mechanisms — but new ones are continually emerging. PoW blockchains have long dominated the cryptocurrency landscape, with both Bitcoin and Ethereum using this model. This means miners are responsible for securing the network and validating transactions — and they get rewarded with new coins as a result. However, a common criticism surrounding Proof-of-Work relates to how much energy it uses, and the impact such blockchains have on the environment. Miners need to use vast amounts of computing power to solve arbitrary mathematical equations. More advanced hardware has been required as the industry matured, with electricity usage surging too.  This has led Proof-of-Stake to be regarded as a mo...