# Module ethcore::engines [−] [src]

Consensus engine specification and basic implementations.

## Structs

AuthorityRound | Engine using `AuthorityRound` proof-of-work consensus algorithm, suitable for Ethereum mainnet chains in the Olympic, Frontier and Homestead eras.
BasicAuthority | Engine using `BasicAuthority` proof-of-work consensus algorithm, suitable for Ethereum mainnet chains in the Olympic, Frontier and Homestead eras.
InstantSeal | An engine which does not provide any consensus mechanism, just seals blocks internally.
NullEngine | An engine which does not provide any consensus mechanism and does not seal blocks.
Tendermint | Engine using `Tendermint` consensus algorithm, suitable for EVM chain.

## Enums

EngineError | Voting errors.
Seal | Seal type.

## Traits

Engine | A consensus mechanism for the chain. Generally either proof-of-work or proof-of-stake-based. Provides hooks into each of the major parts of block import.

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