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As of 2018, niether bitcoin nor ethereum have POS. Hyperstake (HYP) however have had Proof of Stake (POS) since 2014. More info about Hyperstake can be found here: https://www.crypto-city.com/index.php/hyperstake-hyp-ann/info/
Vitalik explains the difference between Proof of Stake and Proof of Work ahead of the Casper launch. What makes Proof of Stake superior for Ethereum?
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