Bitcoin Core  24.99.0
P2P Digital Currency
policy.h
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1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2021 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/amount.h>
10 #include <consensus/consensus.h>
11 #include <primitives/transaction.h>
12 #include <script/interpreter.h>
13 #include <script/standard.h>
14 
15 #include <cstdint>
16 #include <string>
17 
18 class CCoinsViewCache;
19 class CFeeRate;
20 class CScript;
21 
23 static constexpr unsigned int DEFAULT_BLOCK_MAX_WEIGHT{MAX_BLOCK_WEIGHT - 4000};
25 static constexpr unsigned int DEFAULT_BLOCK_MIN_TX_FEE{1000};
27 static constexpr unsigned int MAX_STANDARD_TX_WEIGHT{400000};
29 static constexpr unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE{82};
31 static constexpr unsigned int MAX_P2SH_SIGOPS{15};
33 static constexpr unsigned int MAX_STANDARD_TX_SIGOPS_COST{MAX_BLOCK_SIGOPS_COST/5};
35 static constexpr unsigned int DEFAULT_INCREMENTAL_RELAY_FEE{1000};
37 static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP{20};
39 static constexpr bool DEFAULT_PERMIT_BAREMULTISIG{true};
41 static constexpr unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS{100};
43 static constexpr unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE{80};
45 static constexpr unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE{80};
47 static constexpr unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE{3600};
49 static constexpr unsigned int MAX_STANDARD_SCRIPTSIG_SIZE{1650};
55 static constexpr unsigned int DUST_RELAY_TX_FEE{3000};
57 static constexpr unsigned int DEFAULT_MIN_RELAY_TX_FEE{1000};
59 static constexpr unsigned int DEFAULT_ANCESTOR_LIMIT{25};
61 static constexpr unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT_KVB{101};
63 static constexpr unsigned int DEFAULT_DESCENDANT_LIMIT{25};
65 static constexpr unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT_KVB{101};
71 static constexpr unsigned int EXTRA_DESCENDANT_TX_SIZE_LIMIT{10000};
97 
100 
103 
104 CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);
105 
106 bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);
107 
108 bool IsStandard(const CScript& scriptPubKey, const std::optional<unsigned>& max_datacarrier_bytes, TxoutType& whichType);
109 
110 
111 // Changing the default transaction version requires a two step process: first
112 // adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later
113 // allowing the new transaction version in the wallet/RPC.
114 static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2};
115 
120 bool IsStandardTx(const CTransaction& tx, const std::optional<unsigned>& max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
126 bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
134 bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
135 
137 int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop);
138 int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
139 int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
140 
141 static inline int64_t GetVirtualTransactionSize(const CTransaction& tx)
142 {
143  return GetVirtualTransactionSize(tx, 0, 0);
144 }
145 
146 static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx)
147 {
148  return GetVirtualTransactionInputSize(tx, 0, 0);
149 }
150 
151 #endif // BITCOIN_POLICY_POLICY_H
int64_t CAmount
Amount in satoshis (Can be negative)
Definition: amount.h:12
CCoinsView that adds a memory cache for transactions to another CCoinsView.
Definition: coins.h:213
Fee rate in satoshis per kilovirtualbyte: CAmount / kvB.
Definition: feerate.h:33
Serialized script, used inside transaction inputs and outputs.
Definition: script.h:411
The basic transaction that is broadcasted on the network and contained in blocks.
Definition: transaction.h:288
const int32_t nVersion
Definition: transaction.h:300
An input of a transaction.
Definition: transaction.h:74
An output of a transaction.
Definition: transaction.h:157
static constexpr unsigned int LOCKTIME_VERIFY_SEQUENCE
Flags for nSequence and nLockTime locks.
Definition: consensus.h:28
static const unsigned int MAX_BLOCK_WEIGHT
The maximum allowed weight for a block, see BIP 141 (network rule)
Definition: consensus.h:15
static const int64_t MAX_BLOCK_SIGOPS_COST
The maximum allowed number of signature check operations in a block (network rule)
Definition: consensus.h:17
@ SCRIPT_VERIFY_NULLDUMMY
Definition: interpreter.h:62
@ SCRIPT_VERIFY_DISCOURAGE_OP_SUCCESS
Definition: interpreter.h:139
@ SCRIPT_VERIFY_WITNESS
Definition: interpreter.h:106
@ SCRIPT_VERIFY_CONST_SCRIPTCODE
Definition: interpreter.h:128
@ SCRIPT_VERIFY_MINIMALIF
Definition: interpreter.h:116
@ SCRIPT_VERIFY_LOW_S
Definition: interpreter.h:59
@ SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY
Definition: interpreter.h:97
@ SCRIPT_VERIFY_WITNESS_PUBKEYTYPE
Definition: interpreter.h:124
@ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION
Definition: interpreter.h:136
@ SCRIPT_VERIFY_TAPROOT
Definition: interpreter.h:132
@ SCRIPT_VERIFY_STRICTENC
Definition: interpreter.h:52
@ SCRIPT_VERIFY_NULLFAIL
Definition: interpreter.h:120
@ SCRIPT_VERIFY_DERSIG
Definition: interpreter.h:55
@ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_PUBKEYTYPE
Definition: interpreter.h:142
@ SCRIPT_VERIFY_CLEANSTACK
Definition: interpreter.h:92
@ SCRIPT_VERIFY_MINIMALDATA
Definition: interpreter.h:71
@ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS
Definition: interpreter.h:83
@ SCRIPT_VERIFY_CHECKSEQUENCEVERIFY
Definition: interpreter.h:102
@ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM
Definition: interpreter.h:110
int64_t GetVirtualTransactionInputSize(const CTxIn &tx, int64_t nSigOpCost, unsigned int bytes_per_sigop)
Definition: policy.cpp:305
static constexpr unsigned int DEFAULT_BLOCK_MIN_TX_FEE
Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by min...
Definition: policy.h:25
static constexpr unsigned int EXTRA_DESCENDANT_TX_SIZE_LIMIT
An extra transaction can be added to a package, as long as it only has one ancestor and is no larger ...
Definition: policy.h:71
bool IsStandard(const CScript &scriptPubKey, const std::optional< unsigned > &max_datacarrier_bytes, TxoutType &whichType)
Definition: policy.cpp:70
static constexpr unsigned int DEFAULT_INCREMENTAL_RELAY_FEE
Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or rep...
Definition: policy.h:35
static constexpr unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT_KVB
Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors.
Definition: policy.h:61
static constexpr bool DEFAULT_PERMIT_BAREMULTISIG
Default for -permitbaremultisig.
Definition: policy.h:39
static constexpr unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS
The maximum number of witness stack items in a standard P2WSH script.
Definition: policy.h:41
static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS
Used as the flags parameter to sequence and nLocktime checks in non-consensus code.
Definition: policy.h:102
static constexpr unsigned int DUST_RELAY_TX_FEE
Min feerate for defining dust.
Definition: policy.h:55
bool AreInputsStandard(const CTransaction &tx, const CCoinsViewCache &mapInputs)
Check for standard transaction types.
Definition: policy.cpp:177
int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop)
Compute the virtual transaction size (weight reinterpreted as bytes).
Definition: policy.cpp:295
static constexpr unsigned int DEFAULT_DESCENDANT_LIMIT
Default for -limitdescendantcount, max number of in-mempool descendants.
Definition: policy.h:63
bool IsWitnessStandard(const CTransaction &tx, const CCoinsViewCache &mapInputs)
Check if the transaction is over standard P2WSH resources limit: 3600bytes witnessScript size,...
Definition: policy.cpp:211
static constexpr unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE
The maximum size in bytes of each witness stack item in a standard BIP 342 script (Taproot,...
Definition: policy.h:45
static constexpr unsigned int MAX_STANDARD_TX_WEIGHT
The maximum weight for transactions we're willing to relay/mine.
Definition: policy.h:27
static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP
Default for -bytespersigop.
Definition: policy.h:37
static constexpr unsigned int MAX_STANDARD_TX_SIGOPS_COST
The maximum number of sigops we're willing to relay/mine in a single tx.
Definition: policy.h:33
bool IsDust(const CTxOut &txout, const CFeeRate &dustRelayFee)
Definition: policy.cpp:65
static constexpr unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT_KVB
Default for -limitdescendantsize, maximum kilobytes of in-mempool descendants.
Definition: policy.h:65
static constexpr unsigned int DEFAULT_BLOCK_MAX_WEIGHT
Default for -blockmaxweight, which controls the range of block weights the mining code will create.
Definition: policy.h:23
static constexpr unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE
The minimum non-witness size for transactions we're willing to relay/mine (1 segwit input + 1 P2WPKH ...
Definition: policy.h:29
bool IsStandardTx(const CTransaction &tx, const std::optional< unsigned > &max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate &dust_relay_fee, std::string &reason)
Check for standard transaction types.
Definition: policy.cpp:94
static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS
Standard script verification flags that standard transactions will comply with.
Definition: policy.h:77
static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS
For convenience, standard but not mandatory verify flags.
Definition: policy.h:99
static constexpr unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE
The maximum size in bytes of each witness stack item in a standard P2WSH script.
Definition: policy.h:43
CAmount GetDustThreshold(const CTxOut &txout, const CFeeRate &dustRelayFee)
Definition: policy.cpp:26
static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION
Definition: policy.h:114
static constexpr unsigned int MAX_P2SH_SIGOPS
Maximum number of signature check operations in an IsStandard() P2SH script.
Definition: policy.h:31
static constexpr unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE
The maximum size in bytes of a standard witnessScript.
Definition: policy.h:47
static constexpr unsigned int DEFAULT_ANCESTOR_LIMIT
Default for -limitancestorcount, max number of in-mempool ancestors.
Definition: policy.h:59
static constexpr unsigned int MAX_STANDARD_SCRIPTSIG_SIZE
The maximum size of a standard ScriptSig.
Definition: policy.h:49
static constexpr unsigned int DEFAULT_MIN_RELAY_TX_FEE
Default for -minrelaytxfee, minimum relay fee for transactions.
Definition: policy.h:57
static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS
Mandatory script verification flags that all new blocks must comply with for them to be valid.
Definition: standard.h:49
TxoutType
Definition: standard.h:51