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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 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.
# ifndef BITCOIN_POW_H
# define BITCOIN_POW_H
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# include "consensus/params.h"
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# include <stdint.h>
class CBlockHeader ;
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class CBlockIndex ;
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class CChainParams ;
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class uint256 ;
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class arith_uint256 ;
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unsigned int GetNextWorkRequired ( const CBlockIndex * pindexLast , const CBlockHeader * pblock , const Consensus : : Params & ) ;
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unsigned int CalculateNextWorkRequired ( arith_uint256 bnAvg ,
int64_t nLastBlockTime , int64_t nFirstBlockTime ,
const Consensus : : Params & ) ;
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/** Check whether the Equihash solution in a block header is valid */
bool CheckEquihashSolution ( const CBlockHeader * pblock , const CChainParams & ) ;
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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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arith_uint256 GetBlockProof ( const CBlockIndex & block ) ;
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/** Return the time it would take to redo the work difference between from and to, assuming the current hashrate corresponds to the difficulty at tip, in seconds. */
int64_t GetBlockProofEquivalentTime ( const CBlockIndex & to , const CBlockIndex & from , const CBlockIndex & tip , const Consensus : : Params & ) ;
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# endif // BITCOIN_POW_H