Ask HN: Is proof-of-stake algorithm implemented yet?

Hi hackers, there are lots of coin who claims implementing proof of stake as their mining mechanism, however, I have never see one actually doing it. Do anyone know which coin has successfully implemented the proof-of-stake algorithm and how they do it?

PoS is currently being implemented in Ethereum. Software Engineering Daily aired an interesting episode with one of the Ethereum contributers last week about the state of PoS in that project:

https://play.radiopublic.com/software-engineering-daily-6NkL...