"The ‘proof of work’ model which defines the Bitcoin blockchain has historically allowed cryptocurrencies to be mined by those who have the required processing power. This means as more tokens are discovered and purchased, more processing power is required. Naturally, it has come under fire for being unsustainable as the scale and scope of Bitcoin continues to increase.
However, the ‘proof of stake’ model that is currently being used by the Cardano cryptocurrency and being rolled out on the Ethereum blockchain, is less energy intensive. But it does process transactions based on how much certain cryptominers have already earned, meaning it can potentially shut out newcomers to the industry."
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