Speaking of consensus mechanism, in fact, he is a mode of verification and confirmation of the transaction, he is mainly through the vote of the special nodes to complete the confirmation, in general, if for a transaction, a number of interests of unrelated nodes can reach a consensus, then we will be defaulted to the whole network can also reach a consensus.

Do you find Ether fees expensive and slow? Maybe Layer 2 will be an important solution to the current problems of Ether in addition to other blockchains and ETH 2.0.