1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 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_POLICY_POLICY_H
#define BITCOIN_POLICY_POLICY_H
#include <consensus/consensus.h>
#include <policy/feerate.h>
#include <script/interpreter.h>
#include <script/standard.h>
#include <string>
class CCoinsViewCache;
class CTxOut;
/** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
/** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/
static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000;
/** The maximum weight for transactions we're willing to relay/mine */
static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
/** The minimum non-witness size for transactions we're willing to relay/mine (1 segwit input + 1 P2WPKH output = 82 bytes) */
static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82;
/** Maximum number of signature check operations in an IsStandard() P2SH script */
static const unsigned int MAX_P2SH_SIGOPS = 15;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
/** Default for -maxmempool, maximum megabytes of mempool memory usage */
static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
/** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/
static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000;
/** Default for -bytespersigop */
static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
/** Default for -permitbaremultisig */
static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
/** The maximum number of witness stack items in a standard P2WSH script */
static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100;
/** The maximum size in bytes of each witness stack item in a standard P2WSH script */
static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80;
/** The maximum size in bytes of each witness stack item in a standard BIP 342 script (Taproot, leaf version 0xc0) */
static const unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE = 80;
/** The maximum size in bytes of a standard witnessScript */
static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600;
/** The maximum size of a standard ScriptSig */
static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650;
/** Min feerate for defining dust. Historically this has been based on the
* minRelayTxFee, however changing the dust limit changes which transactions are
* standard and should be done with care and ideally rarely. It makes sense to
* only increase the dust limit after prior releases were already not creating
* outputs below the new threshold */
static const unsigned int DUST_RELAY_TX_FEE = 3000;
/**
* Standard script verification flags that standard transactions will comply
* with. However scripts violating these flags may still be present in valid
* blocks and we must accept those blocks.
*/
static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
SCRIPT_VERIFY_DERSIG |
SCRIPT_VERIFY_STRICTENC |
SCRIPT_VERIFY_MINIMALDATA |
SCRIPT_VERIFY_NULLDUMMY |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
SCRIPT_VERIFY_CLEANSTACK |
SCRIPT_VERIFY_MINIMALIF |
SCRIPT_VERIFY_NULLFAIL |
SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
SCRIPT_VERIFY_LOW_S |
SCRIPT_VERIFY_WITNESS |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM |
SCRIPT_VERIFY_WITNESS_PUBKEYTYPE |
SCRIPT_VERIFY_CONST_SCRIPTCODE |
SCRIPT_VERIFY_TAPROOT |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION |
SCRIPT_VERIFY_DISCOURAGE_OP_SUCCESS |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_PUBKEYTYPE;
/** For convenience, standard but not mandatory verify flags. */
static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
/** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */
static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
LOCKTIME_MEDIAN_TIME_PAST;
CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);
bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);
bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType);
// Changing the default transaction version requires a two step process: first
// adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later
// allowing the new transaction version in the wallet/RPC.
static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2};
/**
* Check for standard transaction types
* @return True if all outputs (scriptPubKeys) use only standard transaction forms
*/
bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
/**
* Check for standard transaction types
* @param[in] mapInputs Map of previous transactions that have outputs we're spending
* @param[in] taproot_active Whether or taproot consensus rules are active (used to decide whether spends of them are permitted)
* @return True if all inputs (scriptSigs) use only standard transaction forms
*/
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, bool taproot_active);
/**
* Check if the transaction is over standard P2WSH resources limit:
* 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements
* These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL.
*
* Also enforce a maximum stack item size limit and no annexes for tapscript spends.
*/
bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
/** Compute the virtual transaction size (weight reinterpreted as bytes). */
int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop);
int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
static inline int64_t GetVirtualTransactionSize(const CTransaction& tx)
{
return GetVirtualTransactionSize(tx, 0, 0);
}
static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx)
{
return GetVirtualTransactionInputSize(tx, 0, 0);
}
#endif // BITCOIN_POLICY_POLICY_H
|
