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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 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_MAIN_H
#define BITCOIN_MAIN_H
#if defined(HAVE_CONFIG_H)
#include "config/bitcoin-config.h"
#endif
#include "amount.h"
#include "chain.h"
#include "coins.h"
#include "net.h"
#include "script/script_error.h"
#include "sync.h"
#include "versionbits.h"
#include <algorithm>
#include <exception>
#include <map>
#include <set>
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>
#include <boost/unordered_map.hpp>
class CBlockIndex;
class CBlockTreeDB;
class CBloomFilter;
class CChainParams;
class CInv;
class CScriptCheck;
class CTxMemPool;
class CValidationInterface;
class CValidationState;
struct CNodeStateStats;
struct LockPoints;
/** Default for DEFAULT_WHITELISTRELAY. */
static const bool DEFAULT_WHITELISTRELAY = true;
/** Default for DEFAULT_WHITELISTFORCERELAY. */
static const bool DEFAULT_WHITELISTFORCERELAY = true;
/** Default for -minrelaytxfee, minimum relay fee for transactions */
static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
//! -maxtxfee default
static const CAmount DEFAULT_TRANSACTION_MAXFEE = 0.1 * COIN;
//! Discourage users to set fees higher than this amount (in satoshis) per kB
static const CAmount HIGH_TX_FEE_PER_KB = 0.01 * COIN;
//! -maxtxfee will warn if called with a higher fee than this amount (in satoshis)
static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Default for -limitancestorcount, max number of in-mempool ancestors */
static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
/** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
/** Default for -limitdescendantcount, max number of in-mempool descendants */
static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
/** Default for -limitdescendantsize, maximum kilobytes of in-mempool descendants */
static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
/** Default for -mempoolexpiry, expiration time for mempool transactions in hours */
static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 72;
/** The maximum size of a blk?????.dat file (since 0.8) */
static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
/** Maximum number of script-checking threads allowed */
static const int MAX_SCRIPTCHECK_THREADS = 16;
/** -par default (number of script-checking threads, 0 = auto) */
static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
/** Number of blocks that can be requested at any given time from a single peer. */
static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
/** Timeout in seconds during which a peer must stall block download progress before being disconnected. */
static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
/** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
* less than this number, we reached its tip. Changing this value is a protocol upgrade. */
static const unsigned int MAX_HEADERS_RESULTS = 2000;
/** Size of the "block download window": how far ahead of our current height do we fetch?
* Larger windows tolerate larger download speed differences between peer, but increase the potential
* degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
* harder). We'll probably want to make this a per-peer adaptive value at some point. */
static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
/** Time to wait (in seconds) between writing blocks/block index to disk. */
static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
/** Time to wait (in seconds) between flushing chainstate to disk. */
static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
/** Maximum length of reject messages. */
static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
/** Average delay between local address broadcasts in seconds. */
static const unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 24 * 60;
/** Average delay between peer address broadcasts in seconds. */
static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
/** Average delay between trickled inventory transmissions in seconds.
* Blocks and whitelisted receivers bypass this, outbound peers get half this delay. */
static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5;
/** Maximum number of inventory items to send per transmission.
* Limits the impact of low-fee transaction floods. */
static const unsigned int INVENTORY_BROADCAST_MAX = 7 * INVENTORY_BROADCAST_INTERVAL;
/** Average delay between feefilter broadcasts in seconds. */
static const unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60;
/** Maximum feefilter broadcast delay after significant change. */
static const unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60;
/** Block download timeout base, expressed in millionths of the block interval (i.e. 10 min) */
static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000;
/** Additional block download timeout per parallel downloading peer (i.e. 5 min) */
static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000;
static const unsigned int DEFAULT_LIMITFREERELAY = 15;
static const bool DEFAULT_RELAYPRIORITY = true;
static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
/** Default for -permitbaremultisig */
static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
static const bool DEFAULT_TXINDEX = false;
static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
static const bool DEFAULT_TESTSAFEMODE = false;
/** Default for -mempoolreplacement */
static const bool DEFAULT_ENABLE_REPLACEMENT = true;
/** Default for using fee filter */
static const bool DEFAULT_FEEFILTER = true;
/** Maximum number of headers to announce when relaying blocks with headers message.*/
static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
static const bool DEFAULT_PEERBLOOMFILTERS = true;
struct BlockHasher
{
size_t operator()(const uint256& hash) const { return hash.GetCheapHash(); }
};
extern CScript COINBASE_FLAGS;
extern CCriticalSection cs_main;
extern CTxMemPool mempool;
typedef boost::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
extern BlockMap mapBlockIndex;
extern uint64_t nLastBlockTx;
extern uint64_t nLastBlockSize;
extern const std::string strMessageMagic;
extern CWaitableCriticalSection csBestBlock;
extern CConditionVariable cvBlockChange;
extern bool fImporting;
extern bool fReindex;
extern int nScriptCheckThreads;
extern bool fTxIndex;
extern bool fIsBareMultisigStd;
extern bool fRequireStandard;
extern unsigned int nBytesPerSigOp;
extern bool fCheckBlockIndex;
extern bool fCheckpointsEnabled;
extern size_t nCoinCacheUsage;
/** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
extern CFeeRate minRelayTxFee;
/** Absolute maximum transaction fee (in satoshis) used by wallet and mempool (rejects high fee in sendrawtransaction) */
extern CAmount maxTxFee;
/** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
extern int64_t nMaxTipAge;
extern bool fEnableReplacement;
/** Best header we've seen so far (used for getheaders queries' starting points). */
extern CBlockIndex *pindexBestHeader;
/** Minimum disk space required - used in CheckDiskSpace() */
static const uint64_t nMinDiskSpace = 52428800;
/** Pruning-related variables and constants */
/** True if any block files have ever been pruned. */
extern bool fHavePruned;
/** True if we're running in -prune mode. */
extern bool fPruneMode;
/** Number of MiB of block files that we're trying to stay below. */
extern uint64_t nPruneTarget;
/** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */
static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
static const signed int DEFAULT_CHECKBLOCKS = MIN_BLOCKS_TO_KEEP;
static const unsigned int DEFAULT_CHECKLEVEL = 3;
// Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)
// At 1MB per block, 288 blocks = 288MB.
// Add 15% for Undo data = 331MB
// Add 20% for Orphan block rate = 397MB
// We want the low water mark after pruning to be at least 397 MB and since we prune in
// full block file chunks, we need the high water mark which triggers the prune to be
// one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
// Setting the target to > than 550MB will make it likely we can respect the target.
static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
/** Register with a network node to receive its signals */
void RegisterNodeSignals(CNodeSignals& nodeSignals);
/** Unregister a network node */
void UnregisterNodeSignals(CNodeSignals& nodeSignals);
/**
* Process an incoming block. This only returns after the best known valid
* block is made active. Note that it does not, however, guarantee that the
* specific block passed to it has been checked for validity!
*
* @param[out] state This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganisation; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation.
* @param[in] pfrom The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
* @param[in] pblock The block we want to process.
* @param[in] fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers.
* @param[out] dbp The already known disk position of pblock, or NULL if not yet stored.
* @return True if state.IsValid()
*/
bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp);
/** Check whether enough disk space is available for an incoming block */
bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
/** Open a block file (blk?????.dat) */
FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false);
/** Open an undo file (rev?????.dat) */
FILE* OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false);
/** Translation to a filesystem path */
boost::filesystem::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix);
/** Import blocks from an external file */
bool LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, CDiskBlockPos *dbp = NULL);
/** Initialize a new block tree database + block data on disk */
bool InitBlockIndex(const CChainParams& chainparams);
/** Load the block tree and coins database from disk */
bool LoadBlockIndex();
/** Unload database information */
void UnloadBlockIndex();
/** Process protocol messages received from a given node */
bool ProcessMessages(CNode* pfrom);
/**
* Send queued protocol messages to be sent to a give node.
*
* @param[in] pto The node which we are sending messages to.
*/
bool SendMessages(CNode* pto);
/** Run an instance of the script checking thread */
void ThreadScriptCheck();
/** Try to detect Partition (network isolation) attacks against us */
void PartitionCheck(bool (*initialDownloadCheck)(), CCriticalSection& cs, const CBlockIndex *const &bestHeader, int64_t nPowTargetSpacing);
/** Check whether we are doing an initial block download (synchronizing from disk or network) */
bool IsInitialBlockDownload();
/** Format a string that describes several potential problems detected by the core.
* strFor can have three values:
* - "rpc": get critical warnings, which should put the client in safe mode if non-empty
* - "statusbar": get all warnings
* - "gui": get all warnings, translated (where possible) for GUI
* This function only returns the highest priority warning of the set selected by strFor.
*/
std::string GetWarnings(const std::string& strFor);
/** Retrieve a transaction (from memory pool, or from disk, if possible) */
bool GetTransaction(const uint256 &hash, CTransaction &tx, const Consensus::Params& params, uint256 &hashBlock, bool fAllowSlow = false);
/** Find the best known block, and make it the tip of the block chain */
bool ActivateBestChain(CValidationState& state, const CChainParams& chainparams, const CBlock* pblock = NULL);
CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
/**
* Prune block and undo files (blk???.dat and undo???.dat) so that the disk space used is less than a user-defined target.
* The user sets the target (in MB) on the command line or in config file. This will be run on startup and whenever new
* space is allocated in a block or undo file, staying below the target. Changing back to unpruned requires a reindex
* (which in this case means the blockchain must be re-downloaded.)
*
* Pruning functions are called from FlushStateToDisk when the global fCheckForPruning flag has been set.
* Block and undo files are deleted in lock-step (when blk00003.dat is deleted, so is rev00003.dat.)
* Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 1000 on regtest).
* Pruning will never delete a block within a defined distance (currently 288) from the active chain's tip.
* The block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks that were stored in the deleted files.
* A db flag records the fact that at least some block files have been pruned.
*
* @param[out] setFilesToPrune The set of file indices that can be unlinked will be returned
*/
void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfterHeight);
/**
* Actually unlink the specified files
*/
void UnlinkPrunedFiles(std::set<int>& setFilesToPrune);
/** Create a new block index entry for a given block hash */
CBlockIndex * InsertBlockIndex(uint256 hash);
/** Get statistics from node state */
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
/** Increase a node's misbehavior score. */
void Misbehaving(NodeId nodeid, int howmuch);
/** Flush all state, indexes and buffers to disk. */
void FlushStateToDisk();
/** Prune block files and flush state to disk. */
void PruneAndFlush();
/** (try to) add transaction to memory pool **/
bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
bool* pfMissingInputs, bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
/** Convert CValidationState to a human-readable message for logging */
std::string FormatStateMessage(const CValidationState &state);
/** Get the BIP9 state for a given deployment at the current tip. */
ThresholdState VersionBitsTipState(const Consensus::Params& params, Consensus::DeploymentPos pos);
struct CNodeStateStats {
int nMisbehavior;
int nSyncHeight;
int nCommonHeight;
std::vector<int> vHeightInFlight;
};
/**
* Count ECDSA signature operations the old-fashioned (pre-0.6) way
* @return number of sigops this transaction's outputs will produce when spent
* @see CTransaction::FetchInputs
*/
unsigned int GetLegacySigOpCount(const CTransaction& tx);
/**
* Count ECDSA signature operations in pay-to-script-hash inputs.
*
* @param[in] mapInputs Map of previous transactions that have outputs we're spending
* @return maximum number of sigops required to validate this transaction's inputs
* @see CTransaction::FetchInputs
*/
unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);
/**
* Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
* This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it
* instead of being performed inline.
*/
bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &view, bool fScriptChecks,
unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks = NULL);
/** Apply the effects of this transaction on the UTXO set represented by view */
void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, int nHeight);
/** Context-independent validity checks */
bool CheckTransaction(const CTransaction& tx, CValidationState& state);
/**
* Check if transaction is final and can be included in a block with the
* specified height and time. Consensus critical.
*/
bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime);
/**
* Check if transaction will be final in the next block to be created.
*
* Calls IsFinalTx() with current block height and appropriate block time.
*
* See consensus/consensus.h for flag definitions.
*/
bool CheckFinalTx(const CTransaction &tx, int flags = -1);
/**
* Test whether the LockPoints height and time are still valid on the current chain
*/
bool TestLockPointValidity(const LockPoints* lp);
/**
* Check if transaction is final per BIP 68 sequence numbers and can be included in a block.
* Consensus critical. Takes as input a list of heights at which tx's inputs (in order) confirmed.
*/
bool SequenceLocks(const CTransaction &tx, int flags, std::vector<int>* prevHeights, const CBlockIndex& block);
/**
* Check if transaction will be BIP 68 final in the next block to be created.
*
* Simulates calling SequenceLocks() with data from the tip of the current active chain.
* Optionally stores in LockPoints the resulting height and time calculated and the hash
* of the block needed for calculation or skips the calculation and uses the LockPoints
* passed in for evaluation.
* The LockPoints should not be considered valid if CheckSequenceLocks returns false.
*
* See consensus/consensus.h for flag definitions.
*/
bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = NULL, bool useExistingLockPoints = false);
/**
* Closure representing one script verification
* Note that this stores references to the spending transaction
*/
class CScriptCheck
{
private:
CScript scriptPubKey;
const CTransaction *ptxTo;
unsigned int nIn;
unsigned int nFlags;
bool cacheStore;
ScriptError error;
public:
CScriptCheck(): ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn) :
scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR) { }
bool operator()();
void swap(CScriptCheck &check) {
scriptPubKey.swap(check.scriptPubKey);
std::swap(ptxTo, check.ptxTo);
std::swap(nIn, check.nIn);
std::swap(nFlags, check.nFlags);
std::swap(cacheStore, check.cacheStore);
std::swap(error, check.error);
}
ScriptError GetScriptError() const { return error; }
};
/** Functions for disk access for blocks */
bool WriteBlockToDisk(const CBlock& block, CDiskBlockPos& pos, const CMessageHeader::MessageStartChars& messageStart);
bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos, const Consensus::Params& consensusParams);
bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex, const Consensus::Params& consensusParams);
/** Functions for validating blocks and updating the block tree */
/** Context-independent validity checks */
bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, bool fCheckPOW = true);
bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::Params& consensusParams, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
/** Context-dependent validity checks.
* By "context", we mean only the previous block headers, but not the UTXO
* set; UTXO-related validity checks are done in ConnectBlock(). */
bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, CBlockIndex* pindexPrev, int64_t nAdjustedTime);
bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIndex *pindexPrev);
/** Apply the effects of this block (with given index) on the UTXO set represented by coins.
* Validity checks that depend on the UTXO set are also done; ConnectBlock()
* can fail if those validity checks fail (among other reasons). */
bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins,
const CChainParams& chainparams, bool fJustCheck = false);
/** Undo the effects of this block (with given index) on the UTXO set represented by coins.
* In case pfClean is provided, operation will try to be tolerant about errors, and *pfClean
* will be true if no problems were found. Otherwise, the return value will be false in case
* of problems. Note that in any case, coins may be modified. */
bool DisconnectBlock(const CBlock& block, CValidationState& state, const CBlockIndex* pindex, CCoinsViewCache& coins, bool* pfClean = NULL);
/** Check a block is completely valid from start to finish (only works on top of our current best block, with cs_main held) */
bool TestBlockValidity(CValidationState& state, const CChainParams& chainparams, const CBlock& block, CBlockIndex* pindexPrev, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
/** RAII wrapper for VerifyDB: Verify consistency of the block and coin databases */
class CVerifyDB {
public:
CVerifyDB();
~CVerifyDB();
bool VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview, int nCheckLevel, int nCheckDepth);
};
/** Find the last common block between the parameter chain and a locator. */
CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator);
/** Mark a block as invalid. */
bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex *pindex);
/** Remove invalidity status from a block and its descendants. */
bool ResetBlockFailureFlags(CBlockIndex *pindex);
/** The currently-connected chain of blocks (protected by cs_main). */
extern CChain chainActive;
/** Global variable that points to the active CCoinsView (protected by cs_main) */
extern CCoinsViewCache *pcoinsTip;
/** Global variable that points to the active block tree (protected by cs_main) */
extern CBlockTreeDB *pblocktree;
/**
* Return the spend height, which is one more than the inputs.GetBestBlock().
* While checking, GetBestBlock() refers to the parent block. (protected by cs_main)
* This is also true for mempool checks.
*/
int GetSpendHeight(const CCoinsViewCache& inputs);
extern VersionBitsCache versionbitscache;
/**
* Determine what nVersion a new block should use.
*/
int32_t ComputeBlockVersion(const CBlockIndex* pindexPrev, const Consensus::Params& params);
/** Reject codes greater or equal to this can be returned by AcceptToMemPool
* for transactions, to signal internal conditions. They cannot and should not
* be sent over the P2P network.
*/
static const unsigned int REJECT_INTERNAL = 0x100;
/** Too high fee. Can not be triggered by P2P transactions */
static const unsigned int REJECT_HIGHFEE = 0x100;
/** Transaction is already known (either in mempool or blockchain) */
static const unsigned int REJECT_ALREADY_KNOWN = 0x101;
/** Transaction conflicts with a transaction already known */
static const unsigned int REJECT_CONFLICT = 0x102;
#endif // BITCOIN_MAIN_H
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