pow

type Engine interface {

	// SealCandidate generates a new candidate with the local miner's seal place on top.
	SealCandidate(candidate *types.Candidate, stop <-chan struct{}) (*types.Candidate, error)

	// VerifyCandidate checks whether the crypto seal on a candidate is valid according to
	// the consensus rules of the given engine.
	VerifyCandidate(chain types.KeyChainReader, candidate *types.Candidate) error

	// Prepare initializes the consensus fields of a candidate according to the
	// rules of a particular engine. The changes are executed inline.
	PrepareCandidate(chain types.KeyChainReader, candidate *types.Candidate, CommitteeSize int) error

	// APIs returns the RPC APIs this consensus engine provides.
	APIs(chain types.ChainReader) []rpc.API

	CalcKeyBlockDifficulty(chain types.KeyChainReader, time uint64, parent *types.KeyBlockHeader) *big.Int
	PowMode() uint
}

type PoW interface {
	Engine

	// Hashrate returns the current mining hashrate of a PoW consensus engine.
	Hashrate() float64
}