mirror of
https://github.com/bitcoin/bitcoin.git
synced 2025-04-29 14:59:39 -04:00
c4cc9e3e9d
Split CheckProofOfWorkImpl() to introduce a helper function DeriveTarget() which converts the nBits value to the target. The function takes pow_limit as an argument so later commits can avoid having to pass ChainstateManager through the call stack. Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
|
|
// Copyright (c) 2009-2022 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;
|
|
|
|
/**
|
|
* Convert nBits value to target.
|
|
*
|
|
* @param[in] nBits compact representation of the target
|
|
* @param[in] pow_limit PoW limit (consensus parameter)
|
|
*
|
|
* @return the proof-of-work target or nullopt if the nBits value
|
|
* is invalid (due to overflow or exceeding pow_limit)
|
|
*/
|
|
std::optional<arith_uint256> DeriveTarget(unsigned int nBits, const uint256 pow_limit);
|
|
|
|
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&);
|
|
bool CheckProofOfWorkImpl(uint256 hash, unsigned int nBits, const Consensus::Params&);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* Always returns true on networks where min difficulty blocks are allowed,
|
|
* such as regtest/testnet.
|
|
*/
|
|
bool PermittedDifficultyTransition(const Consensus::Params& params, int64_t height, uint32_t old_nbits, uint32_t new_nbits);
|
|
|
|
#endif // BITCOIN_POW_H
|