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To achieve consensus, the bitcoin network uses what's called a proof of work (PoW) mechanism.
The first version of the Ethereum blockchain-Frontier-also uses proof of work, but the developers of Ethereum 1.1 expect to replace it with a proof of stake mechanism.
Proof of activity is another mechanism; it combines proof of work and proof of stake, where a random number of miners must sign off on the block using a cryptokey before the block becomes official.9 Proof of capacity requires miners to allot a sizable volume of their hard drive to mining.
Back's method required e- mailers to provide proof of work when sending the message.
Whichever miner solved the puzzle and submitted proof of work first could receive a number of new bitcoins.
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