Quorum Consensus - chris-j-h/quorum GitHub Wiki

With no need for POW/POS in a permissioned network, Quorum instead offers multiple consensus mechanisms that are more appropriate for consortium chains:

• Raft-based Consensus: A consensus model for faster blocktimes, transaction finality, and on-demand block creation. See Raft-based consensus for Ethereum/Quorum for more information
• Istanbul BFT (Byzantine Fault Tolerance) Consensus: A PBFT-inspired consensus algorithm with transaction finality, by AMIS. See Istanbul BFT Consensus documentation, the RPC API, and this technical web article for more information