Proof Of Authority

In blockchain platforms, consensus mechanisms can be divided into permissionless (Bitcoin, Etherium) and permissioned (Apla, Ethereum Private).

In a permissioned blockchain, all nodes are pre-authenticated. This advantage allows the use of consensus types that provide high transaction rate in addition to other benefits. One of these consensus types is Proof-of-Authority (PoA) consensus.

Proof-of-Authority (POA) is a new consensus algorithms family that provides high performance and fault tolerance. In PoA, rights to generate new blocks are awarded to nodes that have proven their authority to do so. To gain this authority and a right to generate new blocks, a node must pass a preliminary authentication.