params.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-present 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_CONSENSUS_PARAMS_H
#define BITCOIN_CONSENSUS_PARAMS_H
 
#include <script/verify_flags.h>
#include <uint256.h>
 
#include <array>
#include <chrono>
#include <cstdint>
#include <limits>
#include <map>
#include <vector>
 
namespace Consensus {
 
enum BuriedDeployment : int16_t {
    // buried deployments get negative values to avoid overlap with DeploymentPos
    DEPLOYMENT_HEIGHTINCB = std::numeric_limits<int16_t>::min(),
    DEPLOYMENT_CLTV,
    DEPLOYMENT_DERSIG,
    DEPLOYMENT_CSV,
    // SCRIPT_VERIFY_WITNESS is enforced from genesis, but the check for downloading
    // missing witness data is not. BIP 147 also relies on hardcoded activation height.
    DEPLOYMENT_SEGWIT,
};
constexpr bool ValidDeployment(BuriedDeployment dep) { return dep <= DEPLOYMENT_SEGWIT; }
 
enum DeploymentPos : uint16_t {
    DEPLOYMENT_TESTDUMMY,
    // NOTE: Also add new deployments to VersionBitsDeploymentInfo in deploymentinfo.cpp
    // Removing an entry may require bumping MinBIP9WarningHeight.
    MAX_VERSION_BITS_DEPLOYMENTS
};
constexpr bool ValidDeployment(DeploymentPos dep) { return dep < MAX_VERSION_BITS_DEPLOYMENTS; }
 
struct BIP9Deployment {
    int bit{28};
    int64_t nStartTime{NEVER_ACTIVE};
    int64_t nTimeout{NEVER_ACTIVE};
    int min_activation_height{0};
    uint32_t period{2016};
    uint32_t threshold{1916};
 
    static constexpr int64_t NO_TIMEOUT = std::numeric_limits<int64_t>::max();
 
    static constexpr int64_t ALWAYS_ACTIVE = -1;
 
    static constexpr int64_t NEVER_ACTIVE = -2;
};
 
struct Params {
    uint256 hashGenesisBlock;
    int nSubsidyHalvingInterval;
    std::map<uint256, script_verify_flags> script_flag_exceptions;
    int BIP34Height;
    uint256 BIP34Hash;
    int BIP65Height;
    int BIP66Height;
    int CSVHeight;
    int SegwitHeight;
    int MinBIP9WarningHeight;
    std::array<BIP9Deployment,MAX_VERSION_BITS_DEPLOYMENTS> vDeployments;
    uint256 powLimit;
    bool fPowAllowMinDifficultyBlocks;
    bool enforce_BIP94;
    bool fPowNoRetargeting;
    int64_t nPowTargetSpacing;
    int64_t nPowTargetTimespan;
    std::chrono::seconds PowTargetSpacing() const
    {
        return std::chrono::seconds{nPowTargetSpacing};
    }
    int64_t DifficultyAdjustmentInterval() const { return nPowTargetTimespan / nPowTargetSpacing; }
    uint256 nMinimumChainWork;
    uint256 defaultAssumeValid;
 
    bool signet_blocks{false};
    std::vector<uint8_t> signet_challenge;
 
    int DeploymentHeight(BuriedDeployment dep) const
    {
        switch (dep) {
        case DEPLOYMENT_HEIGHTINCB:
            return BIP34Height;
        case DEPLOYMENT_CLTV:
            return BIP65Height;
        case DEPLOYMENT_DERSIG:
            return BIP66Height;
        case DEPLOYMENT_CSV:
            return CSVHeight;
        case DEPLOYMENT_SEGWIT:
            return SegwitHeight;
        } // no default case, so the compiler can warn about missing cases
        return std::numeric_limits<int>::max();
    }
};
 
} // namespace Consensus
 
#endif // BITCOIN_CONSENSUS_PARAMS_H