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Espeically with proof-of-brain.

It is a way to distribute the token also.

TheThere is still POS on which Ethereum and other token based their consensus mechanism. Its a proof of stake where every node staked to be able to verify blocks of data.

That is true. But you need to have the coin to stake. With PoB, you simply engage with activity.

Thats right. Various activities are now used as a consensus. For instance, proof of sharing for posh.