Initial Vexta Core v0.1.0 release
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src/policy/policy.h
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src/policy/policy.h
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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2020 The Bitcoin Core developers
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// Copyright (c) 2014-2020 The DigiByte 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 DIGIBYTE_POLICY_POLICY_H
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#define DIGIBYTE_POLICY_POLICY_H
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#include <consensus/consensus.h>
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#include <policy/feerate.h>
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#include <script/interpreter.h>
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#include <script/standard.h>
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#include <string>
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class CCoinsViewCache;
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class CTxOut;
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/** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
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static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 0;
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/** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
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static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
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/** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/
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static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 100000;
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/** The maximum weight for transactions we're willing to relay/mine */
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static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
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/** The minimum non-witness size for transactions we're willing to relay/mine (1 segwit input + 1 P2WPKH output = 82 bytes) */
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static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82;
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/** Maximum number of signature check operations in an IsStandard() P2SH script */
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static const unsigned int MAX_P2SH_SIGOPS = 15;
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/** The maximum number of sigops we're willing to relay/mine in a single tx */
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static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
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/** Default for -maxmempool, maximum megabytes of mempool memory usage */
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static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
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/** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/
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static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 10000;
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/** Default for -bytespersigop */
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static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
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/** Default for -permitbaremultisig */
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static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
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/** The maximum number of witness stack items in a standard P2WSH script */
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static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100;
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/** The maximum size in bytes of each witness stack item in a standard P2WSH script */
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static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80;
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/** The maximum size in bytes of each witness stack item in a standard BIP 342 script (Taproot, leaf version 0xc0) */
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static const unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE = 80;
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/** The maximum size in bytes of a standard witnessScript */
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static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600;
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/** The maximum size of a standard ScriptSig */
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static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650;
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/** Min feerate for defining dust. Historically this has been based on the
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* minRelayTxFee, however changing the dust limit changes which transactions are
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* standard and should be done with care and ideally rarely. It makes sense to
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* only increase the dust limit after prior releases were already not creating
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* outputs below the new threshold */
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static const unsigned int DUST_RELAY_TX_FEE = 30000;
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/**
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* Standard script verification flags that standard transactions will comply
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* with. However scripts violating these flags may still be present in valid
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* blocks and we must accept those blocks.
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*/
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static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
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SCRIPT_VERIFY_DERSIG |
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SCRIPT_VERIFY_STRICTENC |
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SCRIPT_VERIFY_MINIMALDATA |
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SCRIPT_VERIFY_NULLDUMMY |
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
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SCRIPT_VERIFY_CLEANSTACK |
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SCRIPT_VERIFY_MINIMALIF |
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SCRIPT_VERIFY_NULLFAIL |
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SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
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SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
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SCRIPT_VERIFY_LOW_S |
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SCRIPT_VERIFY_WITNESS |
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM |
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SCRIPT_VERIFY_WITNESS_PUBKEYTYPE |
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SCRIPT_VERIFY_CONST_SCRIPTCODE |
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SCRIPT_VERIFY_TAPROOT |
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION |
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SCRIPT_VERIFY_DISCOURAGE_OP_SUCCESS |
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_PUBKEYTYPE;
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/** For convenience, standard but not mandatory verify flags. */
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static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
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/** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */
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static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
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LOCKTIME_MEDIAN_TIME_PAST;
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CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);
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bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);
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bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType);
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// Changing the default transaction version requires a two step process: first
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// adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later
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// allowing the new transaction version in the wallet/RPC.
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static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2};
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/**
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* Check for standard transaction types
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* @return True if all outputs (scriptPubKeys) use only standard transaction forms
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*/
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bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
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/**
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* Check for standard transaction types
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* @param[in] mapInputs Map of previous transactions that have outputs we're spending
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* @param[in] taproot_active Whether or taproot consensus rules are active (used to decide whether spends of them are permitted)
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* @return True if all inputs (scriptSigs) use only standard transaction forms
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*/
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bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, bool taproot_active);
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/**
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* Check if the transaction is over standard P2WSH resources limit:
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* 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements
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* These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL.
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*
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* Also enforce a maximum stack item size limit and no annexes for tapscript spends.
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*/
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bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
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/** Compute the virtual transaction size (weight reinterpreted as bytes). */
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int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop);
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int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
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int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
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static inline int64_t GetVirtualTransactionSize(const CTransaction& tx)
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{
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return GetVirtualTransactionSize(tx, 0, 0);
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}
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static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx)
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{
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return GetVirtualTransactionInputSize(tx, 0, 0);
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}
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#endif // DIGIBYTE_POLICY_POLICY_H
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