95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 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_CONSENSUS_PARAMS_H
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#define BITCOIN_CONSENSUS_PARAMS_H
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#include <uint256.h>
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#include <limits>
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#include <map>
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#include <string>
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namespace Consensus {
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enum DeploymentPos
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{
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DEPLOYMENT_TESTDUMMY,
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DEPLOYMENT_CSV, // Deployment of BIP68, BIP112, and BIP113.
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DEPLOYMENT_SEGWIT = DEPLOYMENT_CSV, // Deployment of BIP141, BIP143, and BIP147.
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// NOTE: Also add new deployments to VersionBitsDeploymentInfo in versionbits.cpp
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MAX_VERSION_BITS_DEPLOYMENTS
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};
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/**
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* Struct for each individual consensus rule change using BIP9.
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*/
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struct BIP9Deployment {
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/** Bit position to select the particular bit in nVersion. */
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int bit;
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/** Start MedianTime for version bits miner confirmation. Can be a date in the past */
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int64_t nStartTime;
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/** Timeout/expiry MedianTime for the deployment attempt. */
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int64_t nTimeout;
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/** Constant for nTimeout very far in the future. */
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static constexpr int64_t NO_TIMEOUT = std::numeric_limits<int64_t>::max();
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/** Special value for nStartTime indicating that the deployment is always active.
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* This is useful for testing, as it means tests don't need to deal with the activation
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* process (which takes at least 3 BIP9 intervals). Only tests that specifically test the
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* behaviour during activation cannot use this. */
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static constexpr int64_t ALWAYS_ACTIVE = -1;
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};
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/**
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* Parameters that influence chain consensus.
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*/
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struct Params {
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uint256 hashGenesisBlock;
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int nSubsidyHalvingInterval;
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/* Block hash that is excepted from BIP16 enforcement */
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uint256 BIP16Exception;
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/** Block height and hash at which BIP34 becomes active */
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int BIP34Height;
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/** Block height at which BIP65 becomes active */
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int BIP65Height;
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/** Block height at which BIP66 becomes active */
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int BIP66Height;
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/**
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* Minimum blocks including miner confirmation of the total of 2016 blocks in a retargeting period,
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* (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
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* Examples: 1916 for 95%, 1512 for testchains.
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*/
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uint32_t nRuleChangeActivationThreshold;
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uint32_t nMinerConfirmationWindow;
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BIP9Deployment vDeployments[MAX_VERSION_BITS_DEPLOYMENTS];
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/** Proof of work parameters */
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uint256 powLimit;
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uint256 prePowLimit;
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bool fPowAllowMinDifficultyBlocks;
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bool fPowNoRetargeting;
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int64_t nPowAveragingWindow;
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int64_t nPowMaxAdjustDown;
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int64_t nPowMaxAdjustUp;
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int64_t nPowTargetSpacing;
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int64_t nPowTargetTimespan;
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int64_t DifficultyAdjustmentInterval() const { return nPowTargetTimespan / nPowTargetSpacing; }
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uint256 nMinimumChainWork;
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uint256 defaultAssumeValid;
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int nPowDifficultyBombHeight;
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int64_t AveragingWindowTimespan(bool isFork = false) const { return nPowAveragingWindow * nPowTargetSpacing / (isFork ? 20 : 1); }
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int64_t MinActualTimespan(bool isFork = false) const { return (AveragingWindowTimespan(isFork) * (100 - nPowMaxAdjustUp )) / 100; }
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int64_t MaxActualTimespan(bool isFork = false) const { return (AveragingWindowTimespan(isFork) * (100 + nPowMaxAdjustDown)) / 100; }
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bool fCoinbaseMustBeProtected;
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};
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} // namespace Consensus
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#endif // BITCOIN_CONSENSUS_PARAMS_H
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