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# 1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto # 2 : : // Copyright (c) 2009-2020 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_POLICY_POLICY_H # 7 : : #define BITCOIN_POLICY_POLICY_H # 8 : : # 9 : : #include <consensus/consensus.h> # 10 : : #include <policy/feerate.h> # 11 : : #include <script/interpreter.h> # 12 : : #include <script/standard.h> # 13 : : # 14 : : #include <string> # 15 : : # 16 : : class CCoinsViewCache; # 17 : : class CTxOut; # 18 : : # 19 : : /** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/ # 20 : : static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000; # 21 : : /** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/ # 22 : : static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000; # 23 : : /** The maximum weight for transactions we're willing to relay/mine */ # 24 : : static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000; # 25 : : /** The minimum non-witness size for transactions we're willing to relay/mine (1 segwit input + 1 P2WPKH output = 82 bytes) */ # 26 : : static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82; # 27 : : /** Maximum number of signature check operations in an IsStandard() P2SH script */ # 28 : : static const unsigned int MAX_P2SH_SIGOPS = 15; # 29 : : /** The maximum number of sigops we're willing to relay/mine in a single tx */ # 30 : : static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5; # 31 : : /** Default for -maxmempool, maximum megabytes of mempool memory usage */ # 32 : : static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300; # 33 : : /** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/ # 34 : : static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000; # 35 : : /** Default for -bytespersigop */ # 36 : : static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20; # 37 : : /** Default for -permitbaremultisig */ # 38 : : static const bool DEFAULT_PERMIT_BAREMULTISIG = true; # 39 : : /** The maximum number of witness stack items in a standard P2WSH script */ # 40 : : static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100; # 41 : : /** The maximum size in bytes of each witness stack item in a standard P2WSH script */ # 42 : : static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80; # 43 : : /** The maximum size in bytes of each witness stack item in a standard BIP 342 script (Taproot, leaf version 0xc0) */ # 44 : : static const unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE = 80; # 45 : : /** The maximum size in bytes of a standard witnessScript */ # 46 : : static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600; # 47 : : /** The maximum size of a standard ScriptSig */ # 48 : : static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650; # 49 : : /** Min feerate for defining dust. Historically this has been based on the # 50 : : * minRelayTxFee, however changing the dust limit changes which transactions are # 51 : : * standard and should be done with care and ideally rarely. It makes sense to # 52 : : * only increase the dust limit after prior releases were already not creating # 53 : : * outputs below the new threshold */ # 54 : : static const unsigned int DUST_RELAY_TX_FEE = 3000; # 55 : : /** # 56 : : * Standard script verification flags that standard transactions will comply # 57 : : * with. However scripts violating these flags may still be present in valid # 58 : : * blocks and we must accept those blocks. # 59 : : */ # 60 : : static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS | # 61 : : SCRIPT_VERIFY_DERSIG | # 62 : : SCRIPT_VERIFY_STRICTENC | # 63 : : SCRIPT_VERIFY_MINIMALDATA | # 64 : : SCRIPT_VERIFY_NULLDUMMY | # 65 : : SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS | # 66 : : SCRIPT_VERIFY_CLEANSTACK | # 67 : : SCRIPT_VERIFY_MINIMALIF | # 68 : : SCRIPT_VERIFY_NULLFAIL | # 69 : : SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY | # 70 : : SCRIPT_VERIFY_CHECKSEQUENCEVERIFY | # 71 : : SCRIPT_VERIFY_LOW_S | # 72 : : SCRIPT_VERIFY_WITNESS | # 73 : : SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM | # 74 : : SCRIPT_VERIFY_WITNESS_PUBKEYTYPE | # 75 : : SCRIPT_VERIFY_CONST_SCRIPTCODE | # 76 : : SCRIPT_VERIFY_TAPROOT | # 77 : : SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION | # 78 : : SCRIPT_VERIFY_DISCOURAGE_OP_SUCCESS | # 79 : : SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_PUBKEYTYPE; # 80 : : # 81 : : /** For convenience, standard but not mandatory verify flags. */ # 82 : : static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS; # 83 : : # 84 : : /** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */ # 85 : : static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE | # 86 : : LOCKTIME_MEDIAN_TIME_PAST; # 87 : : # 88 : : CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee); # 89 : : # 90 : : bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee); # 91 : : # 92 : : bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType); # 93 : : # 94 : : # 95 : : // Changing the default transaction version requires a two step process: first # 96 : : // adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later # 97 : : // allowing the new transaction version in the wallet/RPC. # 98 : : static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2}; # 99 : : # 100 : : /** # 101 : : * Check for standard transaction types # 102 : : * @return True if all outputs (scriptPubKeys) use only standard transaction forms # 103 : : */ # 104 : : bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason); # 105 : : /** # 106 : : * Check for standard transaction types # 107 : : * @param[in] mapInputs Map of previous transactions that have outputs we're spending # 108 : : * @param[in] taproot_active Whether or taproot consensus rules are active (used to decide whether spends of them are permitted) # 109 : : * @return True if all inputs (scriptSigs) use only standard transaction forms # 110 : : */ # 111 : : bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, bool taproot_active); # 112 : : /** # 113 : : * Check if the transaction is over standard P2WSH resources limit: # 114 : : * 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements # 115 : : * These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL. # 116 : : * # 117 : : * Also enforce a maximum stack item size limit and no annexes for tapscript spends. # 118 : : */ # 119 : : bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs); # 120 : : # 121 : : /** Compute the virtual transaction size (weight reinterpreted as bytes). */ # 122 : : int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop); # 123 : : int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop); # 124 : : int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop); # 125 : : # 126 : : static inline int64_t GetVirtualTransactionSize(const CTransaction& tx) # 127 : 18499 : { # 128 : 18499 : return GetVirtualTransactionSize(tx, 0, 0); # 129 : 18499 : } # 130 : : # 131 : : static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx) # 132 : 406527 : { # 133 : 406527 : return GetVirtualTransactionInputSize(tx, 0, 0); # 134 : 406527 : } # 135 : : # 136 : : #endif // BITCOIN_POLICY_POLICY_H