Chia, considered to be a green alternative to Bitcoin, and whose mining requires more storage space than processing power, is now said to be causing a shortage of hard drives in Asia.
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Cryptocurrencies based on owning a large number of hard discs, rather than using computer processors, could offer a less energy-intensive alternative to bitcoin and might even make it cheaper to build data centres – although one is already causing soaring demand for hard discs that is disrupting supply chains.
Bitcoin and several other popular cryptocurrencies are created, or mined, using a concept called proof of work, which involves solving computationally difficult puzzles that consume a large amount of electricity. Bitcoin’s annual electricity consumption is estimated to be 148 terawatt-hours and rising, or around the same amount as Poland’s. Now, rival currencies are emerging that instead make use of large numbers of empty hard discs, a concept known as proof of space.