Consensus Mechanisms ===================== - Most blockchains have a lot of things in common and function in similar ways, but one of the ways in which blockchains can be unique is the way consensus is reached. - Consensus mechanisms are protocols that make sure all nodes (device on the blockchain that maintains the blockchain and sometimes processes transactions) are synchronized with each other and agree on which transactions are legitimate and are added to the blockchain. - These consensus mechanisms are crucial for a blockchain in order tofunction correctly. Without a good consensus mechanisms, blockchains are at risk of various attacks.