src/consensus/params.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #ifndef BITCOIN_CONSENSUS_PARAMS_H
   7 #define BITCOIN_CONSENSUS_PARAMS_H
   8
   9 #include "uint256.h"
  10 #include <map>
  11 #include <string>
  12
  13 namespace Consensus {
  14
  15 enum DeploymentPos
  16 {
  17     DEPLOYMENT_TESTDUMMY,
  18     DEPLOYMENT_CSV, // Deployment of BIP68, BIP112, and BIP113.
  19     DEPLOYMENT_SEGWIT, // Deployment of BIP141, BIP143, and BIP147.
  20     // NOTE: Also add new deployments to VersionBitsDeploymentInfo in versionbits.cpp
  21     MAX_VERSION_BITS_DEPLOYMENTS
  22 };
  23
  24 /**
  25  * Struct for each individual consensus rule change using BIP9.
  26  */
  27 struct BIP9Deployment {
  28     /** Bit position to select the particular bit in nVersion. */
  29     int bit;
  30     /** Start MedianTime for version bits miner confirmation. Can be a date in the past */
  31     int64_t nStartTime;
  32     /** Timeout/expiry MedianTime for the deployment attempt. */
  33     int64_t nTimeout;
  34 };
  35
  36 /**
  37  * Parameters that influence chain consensus.
  38  */
  39 struct Params {
  40     uint256 hashGenesisBlock;
  41     int nSubsidyHalvingInterval;
  42     /** Block height and hash at which BIP34 becomes active */
  43     int BIP34Height;
  44     uint256 BIP34Hash;
  45     /** Block height at which BIP65 becomes active */
  46     int BIP65Height;
  47     /** Block height at which BIP66 becomes active */
  48     int BIP66Height;
  49     /**
  50      * Minimum blocks including miner confirmation of the total of 2016 blocks in a retargeting period,
  51      * (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
  52      * Examples: 1916 for 95%, 1512 for testchains.
  53      */
  54     uint32_t nRuleChangeActivationThreshold;
  55     uint32_t nMinerConfirmationWindow;
  56     BIP9Deployment vDeployments[MAX_VERSION_BITS_DEPLOYMENTS];
  57     /** Proof of work parameters */
  58     uint256 powLimit;
  59     bool fPowAllowMinDifficultyBlocks;
  60     bool fPowNoRetargeting;
  61     int64_t nPowTargetSpacing;
  62     int64_t nPowTargetTimespan;
  63     int64_t DifficultyAdjustmentInterval() const { return nPowTargetTimespan / nPowTargetSpacing; }
  64     uint256 nMinimumChainWork;
  65     uint256 defaultAssumeValid;
  66 };
  67 } // namespace Consensus
  68
  69 #endif // BITCOIN_CONSENSUS_PARAMS_H