pow.cpp File Reference

#include <pow/pow.h>
#include <arith_uint256.h>
#include <chain.h>
#include <chainparams.h>
#include <common/system.h>
#include <consensus/activation.h>
#include <consensus/params.h>
#include <pow/aserti32d.h>
#include <pow/daa.h>
#include <pow/eda.h>
#include <pow/grasberg.h>
#include <primitives/blockhash.h>

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Functions
uint32_t	GetNextWorkRequired (const CBlockIndex *pindexPrev, const CBlockHeader *pblock, const CChainParams &chainParams)
bool	PermittedDifficultyTransition (const Consensus::Params &params, int64_t height, uint32_t old_nbits, uint32_t new_nbits)
	Return false if the proof-of-work requirement specified by new_nbits at a given height is not possible, given the proof-of-work on the prior block as specified by old_nbits.
bool	CheckProofOfWork (const BlockHash &hash, uint32_t nBits, const Consensus::Params &params)
	Check whether a block hash satisfies the proof-of-work requirement specified by nBits.
bool	NBitsToTarget (const Consensus::Params &params, uint32_t nBits, arith_uint256 &target)
	Convert a header bits difficulty representation to a 256 bits hash target.

Function Documentation

CheckProofOfWork()

bool CheckProofOfWork	(	const BlockHash &	hash,
		uint32_t	nBits,
		const Consensus::Params &	params
	)

Check whether a block hash satisfies the proof-of-work requirement specified by nBits.

Definition at line 87 of file pow.cpp.

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GetNextWorkRequired()

uint32_t GetNextWorkRequired	(	const CBlockIndex *	pindexPrev,
		const CBlockHeader *	pblock,
		const CChainParams &	chainParams
	)

Definition at line 21 of file pow.cpp.

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NBitsToTarget()

bool NBitsToTarget	(	const Consensus::Params &	params,
		uint32_t	nBits,
		arith_uint256 &	target
	)

Convert a header bits difficulty representation to a 256 bits hash target.

Definition at line 102 of file pow.cpp.

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PermittedDifficultyTransition()

bool PermittedDifficultyTransition	(	const Consensus::Params &	params,
		int64_t	height,
		uint32_t	old_nbits,
		uint32_t	new_nbits
	)

Return false if the proof-of-work requirement specified by new_nbits at a given height is not possible, given the proof-of-work on the prior block as specified by old_nbits.

For blocks prior to the UAHF, this function only checks that the new value is within a factor of 4 of the old value for blocks at the difficulty adjustment interval, and otherwise requires the values to be the same.

For blocks after UAHF and before the switch to CW-144, the difficulty is allowed to change for any blocks, but still within a factor 4.

After the switch to the CW-144 DAA, any change in difficulty is theoretically possible, so always return true.

Always returns true on networks where min difficulty blocks are allowed, such as regtest/testnet.

Definition at line 47 of file pow.cpp.

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