pow.h
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	// Copyright (c) 2009-2010 Satoshi Nakamoto
	// Copyright (c) 2009-2014 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#ifndef BITCOIN_POW_H
	#define BITCOIN_POW_H

	#include "consensus/params.h"

	#include <stdint.h>

	class CBlockHeader;
	class CBlockIndex;
	class uint256;
	class arith_uint256;

	unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
	unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);

	/** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
	bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
	arith_uint256 GetBlockProof(const CBlockIndex& block);

	/** 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&);

	#endif // BITCOIN_POW_H