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Yeah, they have a proof of concept code up on their github, only started on it in the past few weeks though. Up till now it's all been math and research.

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The first casper PoC was in 2015, and PoC2 was in early 2016.[1] However, there was a pivot from the early "consensus-by-bet" to the current version, which is based on "prepare and commit" messages. I think the current one is PoC4. [2,3]

1. https://blog.ethereum.org/2016/03/05/serenity-poc2/ 2. https://github.com/ethereum/casper 3. https://github.com/ethereum/pyethereum/pull/791

Thanks, that's a lot more than I thought.

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