Proof-of-authority (PoA) is an algorithm used with blockchains that delivers comparatively fast transactions through a consensus mechanism based on identity as a stake - wikipedia

- Why POA on - cointelegraph

In PoA-based networks, transactions and blocks are validated by approved accounts, known as validators. Validators run software allowing them to put transactions in blocks. The process is automated and does not require validators to be constantly monitoring their computers. It, however, does require maintaining the computer (the authority node (node (networking))

The term was coined by Gavin Wood, co-founder of Ethereum and Parity Technologies.

- POA Network - - PoA Private Chains on github

With PoA individuals earn the right to become validators, so there is an incentive to retain the position that they have gained. By attaching reputation to identity, validators are incentivised to uphold the transaction process, as they do not wish to have their identities attached to a negative reputation. This is considered more robust than PoS, as:

* In PoS, while a stake between two parties may be even, it does not take into account each party’s total holdings. This means that incentives can be unbalanced. * Meanwhile, PoW uses an enormous amount of computing power, which, in itself lowers incentive. It is also vulnerable to attack, as a potential attacker would only need to have 51% of the mining resources (hashrate) to control a network, although this is not easy to do -

PoA is suited for private networks but not for public networks where trust should be distributed.

# Establishing authority

The three main conditions that must be fulfilled for a validator to be established are:

- Identity must be formally verified on-chain (blockchain), with a possibility to cross-check the information in a publicly available domain - Eligibility must be difficult to obtain, to make the right to validate the blocks earned and valued. (Example: potential validators are required to obtain public notary license)

- There must be complete uniformity in the checks and procedures for establishing an authority