Rules by which the participants in a distributed ledger agree on which new records to accept without trusting any one of them. Proof of work makes a participant spend computing effort to earn the right to add a block, which is the approach used by Bitcoin, while proof of authority gives that right to approved validators whose identity is staked. They differ in energy use, speed and the kind of trust they require.
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Blockchain Consensus Mechanisms
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Proof of work (Wikipedia)
Has Member: Proof of work, LeadQuote, Has Member: Proof of work, Lead
Proof of work (also written as proof-of-work, and abbreviated PoW) is a form of cryptographic proof in which one party (the prover) proves to others (the verifiers) that a certain amount of a specific computational effort has been expended.
Wikipedia: Proof of authority
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Proof of authority (PoA) is a category of consensus protocols used with blockchains based on reputation and identity as a stake that delivers comparatively fast and efficient transactions (compared to proof-of-work and proof-of-stake).
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