An update rolled out by the Ethereum cryptocurrency reduced the energy needed to produce it by 99.99% by transitioning from "proof of work" to "proof of stake," and also fixed a security flaw in the Go Ethereum software used to run Ethereum nodes.
Massimiliano Taverna at ETH Zurich in Switzerland explained that combining the attacks would have reduced the required computing resources to launch the attacks to only 5 graphics processing units.
Ethereum Classic developers patched the vulnerability after being notified by the researchers, but the researchers said the EthereumPOW cryptocurrency has not been updated.
From New Scientist
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