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I know POW is the Consensus algorithm of ethereum now, and it will be changed to POS. But does ethereum has other Consensus algorithm besides POW and POS? I heard from a man there are other Consensus algorithm in ethereum but I don't know if it is true. thank you .

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It would be nice to compile a list of available consensus algorithms. I marked this answer as "community wiki", feel free to add to the list.

  • Proof of Work (PoW) - currently in Mainnet
  • Proof of Stake (PoS) - currently in research
  • Proof of Authority (PoA):
    • Clique - Geth, Parity and other clients EIP-225
    • AuRa (Authority Round) - Parity
  • Raft - Quorum (Geth fork)
  • IBFT (Istanbul BFT) - Quorum (Geth fork)
  • IBFT 2.0 - Pantheon (Java Ethereum client)
  • ...append here...

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