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This question already has an answer here:

How will the transition from PoW to Casper's PoS work? Is there a spec written? Have there been any tests? Has code or documentation been written?

marked as duplicate by eth, Waqar Lim, Tjaden Hess, Hudson Jameson, Joris Bontje Feb 15 '16 at 8:46

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  • The idea is to force a fork to PoS/Casper. I'm upvoting the question but I think the questions are quite similar and it's good to have the answers in just one spot. – eth Feb 14 '16 at 12:44
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A fork will be needed to allow PoS in the network. All statistics and analytics of proof of stake has not been announced fully in Ethereum, so we are all waiting for that information.

https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity/

https://blog.ethereum.org/2015/08/01/introducing-casper-friendly-ghost/

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