This article uses about 1800 words to say the following (slightly paraphrased): proof of stake does away with wasteful bitcoin miners and replaces them with 'validators.' Instead of investing in energy-intensive computer farms, you invest in the native coins of the system. To become a validator and to win the block rewards, you lock up - or 'stake' - your tokens in a smart contract. Proof of stake hasn't been proven on the scale that proof-of-work platforms have, and there's still the risk the rich get richer and eventually centralize and control the system.
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