The 'proof of brain' is not a consensus algorithm, it is a system that the steem blockchain uses for reward content publication and curation. The consensus algorithm used in the steem blockchain is the Delegated Proof of Stake (DPOS), that I don't mention here but I'll write about it in the future. Basically in it, the first 19 witnesses are chosen randomly to validate a block and the other 2 blocks are validated by another witnesses not in the first 19 and the other one is validated in another way.
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Okay, thanks for the explanation. It can be confusing sometimes, the choice of words etc. I'm looking forward to more posts about this subject from you.