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You mean proof of stake? Is there a working implementation of proof of stake yet? I thought it was mostly theoretical and academic at the moment.


No, I meant proof of work.

You change the proof of work algorithm so that the existing miners can't use their fancy Bitcoin miners, and it becomes profitable to mine with GPUs instead.


algorand is academic at this point with evaluation on ec2. Though the paper is available and an implementation will be following.

Peercoin is one of the first working proof of stake implementations that has been running for close to 5 years now.


There are a few altcoins using Proof of Stake already




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