The multiple peers determine the validity of transactions. With hyperledger upgrade to v1.0 makes it possible for a subset of participants to process certain transactions. The channels supports atomic delivery and reliability.
the channel outputs the same messages to all the connected peers and outputs them to all peers in the same logical order. This is also called total-order broadcast, atomic broadcast or consensus in the context of distributed system. The communicated messages are the candidate transactions for inclusion in the blockchain state.