Ethereum does not use Proof of Stake, it is a proposed change that is being worked on, with a timeline of several years before it will be put into action, and that's only if the network accepts it.
Proof of stake is more secure than proof of work because an attacker must acquire a large amount of ETH each time they attempt an attack. Attacks against proof of stake are incredibly capital-inefficient.
Ethereum is starting to use Proof of Stake which provides the same security as Bitcoin's Proof of Work but without the energy waste. Over the long run proof of work will cease to be used.
Hasn't Ethereum been moving to proof-of-stake for years now? It seems like something that is never going to actually happen, but is always held as redeeming.
This isn't exactly the Bitcoin community per se, but Ethereum is working on a proof-of-stake algorithm to replace proof-of-work. This is a much less energy intensive intensive algorithm, and while I'm a bit skeptical that it's as secure as proof-of-work, I'm glad they are trying something.
reply