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38 lines
1.4 KiB
38 lines
1.4 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_POW_H
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#define BITCOIN_POW_H
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#include <consensus/params.h>
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#include <stdint.h>
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class CBlockHeader;
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class CBlockIndex;
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class uint256;
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unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
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unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
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/** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
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bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
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/**
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* Return false if the proof-of-work requirement specified by new_nbits at a
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* given height is not possible, given the proof-of-work on the prior block as
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* specified by old_nbits.
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*
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* This function only checks that the new value is within a factor of 4 of the
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* old value for blocks at the difficulty adjustment interval, and otherwise
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* requires the values to be the same.
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*
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* Always returns true on networks where min difficulty blocks are allowed,
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* such as regtest/testnet.
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*/
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bool PermittedDifficultyTransition(const Consensus::Params& params, int64_t height, uint32_t old_nbits, uint32_t new_nbits);
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#endif // BITCOIN_POW_H
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