script/interpreter: introduce script_verify_flags typename

Previously the SCRIPT_VERIFY_* flags were specified as either uint32_t,
unsigned int, or unsigned. This converts them to a common type alias in
preparation for changing the underlying type.

src/bench/verify_script.cpp

@@ -24,7 +24,7 @@ static void VerifyScriptBench(benchmark::Bench& bench)
 {
     ECC_Context ecc_context{};
 
-    const uint32_t flags{SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH};
+    const script_verify_flags flags{SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH};
     const int witnessversion = 0;
 
     // Key pair.

src/consensus/params.h

@@ -6,6 +6,7 @@
 #ifndef BITCOIN_CONSENSUS_PARAMS_H
 #define BITCOIN_CONSENSUS_PARAMS_H
 
+#include <script/verify_flags.h>
 #include <uint256.h>
 
 #include <array>
@@ -89,7 +90,7 @@ struct Params {
      * - buried in the chain, and
      * - fail if the default script verify flags are applied.
      */
-    std::map<uint256, uint32_t> script_flag_exceptions;
+    std::map<uint256, script_verify_flags> script_flag_exceptions;
     /** Block height and hash at which BIP34 becomes active */
     int BIP34Height;
     uint256 BIP34Hash;

src/consensus/tx_verify.cpp

@@ -140,7 +140,7 @@ unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& in
     return nSigOps;
 }
 
-int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, uint32_t flags)
+int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, script_verify_flags flags)
 {
     int64_t nSigOps = GetLegacySigOpCount(tx) * WITNESS_SCALE_FACTOR;
 

src/consensus/tx_verify.h

@@ -6,6 +6,7 @@
 #define BITCOIN_CONSENSUS_TX_VERIFY_H
 
 #include <consensus/amount.h>
+#include <script/verify_flags.h>
 
 #include <cstdint>
 #include <vector>
@@ -52,7 +53,7 @@ unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& ma
  * @param[in] flags Script verification flags
  * @return Total signature operation cost of tx
  */
-int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, uint32_t flags);
+int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, script_verify_flags flags);
 
 /**
  * Check if transaction is final and can be included in a block with the

src/policy/policy.h

@@ -98,7 +98,7 @@ static constexpr unsigned int MAX_DUST_OUTPUTS_PER_TX{1};
  * Note that this does not affect consensus validity; see GetBlockScriptFlags()
  * for that.
  */
-static constexpr unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS{SCRIPT_VERIFY_P2SH |
+static constexpr script_verify_flags MANDATORY_SCRIPT_VERIFY_FLAGS{SCRIPT_VERIFY_P2SH |
                                                              SCRIPT_VERIFY_DERSIG |
                                                              SCRIPT_VERIFY_NULLDUMMY |
                                                              SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
@@ -112,7 +112,7 @@ static constexpr unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS{SCRIPT_VERIFY_P2SH |
  * the additional (non-mandatory) rules here, to improve forwards and
  * backwards compatibility.
  */
-static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS{MANDATORY_SCRIPT_VERIFY_FLAGS |
+static constexpr script_verify_flags STANDARD_SCRIPT_VERIFY_FLAGS{MANDATORY_SCRIPT_VERIFY_FLAGS |
                                                              SCRIPT_VERIFY_STRICTENC |
                                                              SCRIPT_VERIFY_MINIMALDATA |
                                                              SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
@@ -128,7 +128,7 @@ static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS{MANDATORY_SCRIPT_VERI
                                                              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};
+static constexpr script_verify_flags 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};

src/script/interpreter.cpp

@@ -198,7 +198,7 @@ bool static IsDefinedHashtypeSignature(const valtype &vchSig) {
     return true;
 }
 
-bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror) {
+bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, script_verify_flags flags, ScriptError* serror) {
     // Empty signature. Not strictly DER encoded, but allowed to provide a
     // compact way to provide an invalid signature for use with CHECK(MULTI)SIG
     if (vchSig.size() == 0) {
@@ -215,7 +215,7 @@ bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned i
     return true;
 }
 
-bool static CheckPubKeyEncoding(const valtype &vchPubKey, unsigned int flags, const SigVersion &sigversion, ScriptError* serror) {
+bool static CheckPubKeyEncoding(const valtype &vchPubKey, script_verify_flags flags, const SigVersion &sigversion, ScriptError* serror) {
     if ((flags & SCRIPT_VERIFY_STRICTENC) != 0 && !IsCompressedOrUncompressedPubKey(vchPubKey)) {
         return set_error(serror, SCRIPT_ERR_PUBKEYTYPE);
     }
@@ -318,7 +318,7 @@ public:
 };
 }
 
-static bool EvalChecksigPreTapscript(const valtype& vchSig, const valtype& vchPubKey, CScript::const_iterator pbegincodehash, CScript::const_iterator pend, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& fSuccess)
+static bool EvalChecksigPreTapscript(const valtype& vchSig, const valtype& vchPubKey, CScript::const_iterator pbegincodehash, CScript::const_iterator pend, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& fSuccess)
 {
     assert(sigversion == SigVersion::BASE || sigversion == SigVersion::WITNESS_V0);
 
@@ -344,7 +344,7 @@ static bool EvalChecksigPreTapscript(const valtype& vchSig, const valtype& vchPu
     return true;
 }
 
-static bool EvalChecksigTapscript(const valtype& sig, const valtype& pubkey, ScriptExecutionData& execdata, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& success)
+static bool EvalChecksigTapscript(const valtype& sig, const valtype& pubkey, ScriptExecutionData& execdata, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& success)
 {
     assert(sigversion == SigVersion::TAPSCRIPT);
 
@@ -389,7 +389,7 @@ static bool EvalChecksigTapscript(const valtype& sig, const valtype& pubkey, Scr
  * A return value of false means the script fails entirely. When true is returned, the
  * success variable indicates whether the signature check itself succeeded.
  */
-static bool EvalChecksig(const valtype& sig, const valtype& pubkey, CScript::const_iterator pbegincodehash, CScript::const_iterator pend, ScriptExecutionData& execdata, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& success)
+static bool EvalChecksig(const valtype& sig, const valtype& pubkey, CScript::const_iterator pbegincodehash, CScript::const_iterator pend, ScriptExecutionData& execdata, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& success)
 {
     switch (sigversion) {
     case SigVersion::BASE:
@@ -404,7 +404,7 @@ static bool EvalChecksig(const valtype& sig, const valtype& pubkey, CScript::con
     assert(false);
 }
 
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptExecutionData& execdata, ScriptError* serror)
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptExecutionData& execdata, ScriptError* serror)
 {
     static const CScriptNum bnZero(0);
     static const CScriptNum bnOne(1);
@@ -1234,7 +1234,7 @@ bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript&
     return set_success(serror);
 }
 
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror)
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror)
 {
     ScriptExecutionData execdata;
     return EvalScript(stack, script, flags, checker, sigversion, execdata, serror);
@@ -1825,7 +1825,7 @@ bool GenericTransactionSignatureChecker<T>::CheckSequence(const CScriptNum& nSeq
 template class GenericTransactionSignatureChecker<CTransaction>;
 template class GenericTransactionSignatureChecker<CMutableTransaction>;
 
-static bool ExecuteWitnessScript(const std::span<const valtype>& stack_span, const CScript& exec_script, unsigned int flags, SigVersion sigversion, const BaseSignatureChecker& checker, ScriptExecutionData& execdata, ScriptError* serror)
+static bool ExecuteWitnessScript(const std::span<const valtype>& stack_span, const CScript& exec_script, script_verify_flags flags, SigVersion sigversion, const BaseSignatureChecker& checker, ScriptExecutionData& execdata, ScriptError* serror)
 {
     std::vector<valtype> stack{stack_span.begin(), stack_span.end()};
 
@@ -1910,7 +1910,7 @@ static bool VerifyTaprootCommitment(const std::vector<unsigned char>& control, c
     return q.CheckTapTweak(p, merkle_root, control[0] & 1);
 }
 
-static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion, const std::vector<unsigned char>& program, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror, bool is_p2sh)
+static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion, const std::vector<unsigned char>& program, script_verify_flags flags, const BaseSignatureChecker& checker, ScriptError* serror, bool is_p2sh)
 {
     CScript exec_script; //!< Actually executed script (last stack item in P2WSH; implied P2PKH script in P2WPKH; leaf script in P2TR)
     std::span stack{witness.stack};
@@ -1995,7 +1995,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
     // There is intentionally no return statement here, to be able to use "control reaches end of non-void function" warnings to detect gaps in the logic above.
 }
 
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
+bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, script_verify_flags flags, const BaseSignatureChecker& checker, ScriptError* serror)
 {
     static const CScriptWitness emptyWitness;
     if (witness == nullptr) {
@@ -2132,7 +2132,7 @@ size_t static WitnessSigOps(int witversion, const std::vector<unsigned char>& wi
     return 0;
 }
 
-size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags)
+size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, script_verify_flags flags)
 {
     static const CScriptWitness witnessEmpty;
 
@@ -2189,13 +2189,13 @@ const std::map<std::string, uint32_t> g_verify_flag_names{
 };
 #undef FLAG_NAME
 
-std::vector<std::string> GetScriptFlagNames(uint32_t flags)
+std::vector<std::string> GetScriptFlagNames(script_verify_flags flags)
 {
     std::vector<std::string> res;
     if (flags == SCRIPT_VERIFY_NONE) {
         return res;
     }
-    uint32_t leftover = flags;
+    script_verify_flags leftover = flags;
     for (const auto& [name, flag] : g_verify_flag_names) {
         if ((flags & flag) != 0) {
             res.push_back(name);

src/script/interpreter.h

@@ -10,6 +10,7 @@
 #include <hash.h>
 #include <primitives/transaction.h>
 #include <script/script_error.h> // IWYU pragma: export
+#include <script/verify_flags.h> // IWYU pragma: export
 #include <span.h>
 #include <uint256.h>
 
@@ -148,7 +149,7 @@ enum : uint32_t {
     SCRIPT_VERIFY_END_MARKER
 };
 
-bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
+bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, script_verify_flags flags, ScriptError* serror);
 
 struct PrecomputedTransactionData
 {
@@ -363,16 +364,16 @@ uint256 ComputeTapbranchHash(std::span<const unsigned char> a, std::span<const u
  *  Requires control block to have valid length (33 + k*32, with k in {0,1,..,128}). */
 uint256 ComputeTaprootMerkleRoot(std::span<const unsigned char> control, const uint256& tapleaf_hash);
 
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptExecutionData& execdata, ScriptError* error = nullptr);
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptExecutionData& execdata, ScriptError* error = nullptr);
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = nullptr);
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = nullptr);
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = nullptr);
+bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, script_verify_flags flags, const BaseSignatureChecker& checker, ScriptError* serror = nullptr);
 
-size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags);
+size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, script_verify_flags flags);
 
 int FindAndDelete(CScript& script, const CScript& b);
 
 extern const std::map<std::string, uint32_t> g_verify_flag_names;
 
-std::vector<std::string> GetScriptFlagNames(uint32_t flags);
+std::vector<std::string> GetScriptFlagNames(script_verify_flags flags);
 
 #endif // BITCOIN_SCRIPT_INTERPRETER_H

src/script/verify_flags.h

@@ -0,0 +1,13 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-present 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_SCRIPT_VERIFY_FLAGS_H
+#define BITCOIN_SCRIPT_VERIFY_FLAGS_H
+
+#include <cstdint>
+
+using script_verify_flags = uint32_t;
+
+#endif // BITCOIN_SCRIPT_VERIFY_FLAGS_H

src/signet.cpp

@@ -26,7 +26,7 @@
 
 static constexpr uint8_t SIGNET_HEADER[4] = {0xec, 0xc7, 0xda, 0xa2};
 
-static constexpr unsigned int BLOCK_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_DERSIG | SCRIPT_VERIFY_NULLDUMMY;
+static constexpr script_verify_flags BLOCK_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_DERSIG | SCRIPT_VERIFY_NULLDUMMY;
 
 static bool FetchAndClearCommitmentSection(const std::span<const uint8_t> header, CScript& witness_commitment, std::vector<uint8_t>& result)
 {

src/test/fuzz/eval_script.cpp

@@ -12,7 +12,7 @@
 FUZZ_TARGET(eval_script)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
-    const unsigned int flags = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
+    const script_verify_flags flags = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
     const std::vector<uint8_t> script_bytes = [&] {
         if (fuzzed_data_provider.remaining_bytes() != 0) {
             return fuzzed_data_provider.ConsumeRemainingBytes<uint8_t>();

src/test/fuzz/script.cpp

@@ -119,7 +119,7 @@ FUZZ_TARGET(script, .init = initialize_script)
         }
         const std::vector<std::string> random_string_vector = ConsumeRandomLengthStringVector(fuzzed_data_provider);
         const uint32_t u32{fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
-        const uint32_t flags{u32 | SCRIPT_VERIFY_P2SH};
+        const script_verify_flags flags{u32 | SCRIPT_VERIFY_P2SH};
         {
             CScriptWitness wit;
             for (const auto& s : random_string_vector) {

src/test/fuzz/script_assets_test_minimizer.cpp

@@ -90,22 +90,22 @@ CScriptWitness ScriptWitnessFromJSON(const UniValue& univalue)
     return scriptwitness;
 }
 
-const std::map<std::string, unsigned int> FLAG_NAMES = {
+const std::map<std::string, uint32_t> FLAG_NAMES = {
-    {std::string("P2SH"), (unsigned int)SCRIPT_VERIFY_P2SH},
+    {std::string("P2SH"), SCRIPT_VERIFY_P2SH},
-    {std::string("DERSIG"), (unsigned int)SCRIPT_VERIFY_DERSIG},
+    {std::string("DERSIG"), SCRIPT_VERIFY_DERSIG},
-    {std::string("NULLDUMMY"), (unsigned int)SCRIPT_VERIFY_NULLDUMMY},
+    {std::string("NULLDUMMY"), SCRIPT_VERIFY_NULLDUMMY},
-    {std::string("CHECKLOCKTIMEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY},
+    {std::string("CHECKLOCKTIMEVERIFY"), SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY},
-    {std::string("CHECKSEQUENCEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKSEQUENCEVERIFY},
+    {std::string("CHECKSEQUENCEVERIFY"), SCRIPT_VERIFY_CHECKSEQUENCEVERIFY},
-    {std::string("WITNESS"), (unsigned int)SCRIPT_VERIFY_WITNESS},
+    {std::string("WITNESS"), SCRIPT_VERIFY_WITNESS},
-    {std::string("TAPROOT"), (unsigned int)SCRIPT_VERIFY_TAPROOT},
+    {std::string("TAPROOT"), SCRIPT_VERIFY_TAPROOT},
 };
 
-std::vector<unsigned int> AllFlags()
+std::vector<script_verify_flags> AllFlags()
 {
-    std::vector<unsigned int> ret;
+    std::vector<script_verify_flags> ret;
 
     for (unsigned int i = 0; i < 128; ++i) {
-        unsigned int flag = 0;
+        script_verify_flags flag = 0;
         if (i & 1) flag |= SCRIPT_VERIFY_P2SH;
         if (i & 2) flag |= SCRIPT_VERIFY_DERSIG;
         if (i & 4) flag |= SCRIPT_VERIFY_NULLDUMMY;
@@ -125,13 +125,13 @@ std::vector<unsigned int> AllFlags()
     return ret;
 }
 
-const std::vector<unsigned int> ALL_FLAGS = AllFlags();
+const std::vector<script_verify_flags> ALL_FLAGS = AllFlags();
 
-unsigned int ParseScriptFlags(const std::string& str)
+script_verify_flags ParseScriptFlags(const std::string& str)
 {
     if (str.empty()) return 0;
 
-    unsigned int flags = 0;
+    script_verify_flags flags = 0;
     std::vector<std::string> words = SplitString(str, ',');
 
     for (const std::string& word : words) {
@@ -153,7 +153,7 @@ void Test(const std::string& str)
     if (prevouts.size() != tx.vin.size()) throw std::runtime_error("Incorrect number of prevouts");
     size_t idx = test["index"].getInt<int64_t>();
     if (idx >= tx.vin.size()) throw std::runtime_error("Invalid index");
-    unsigned int test_flags = ParseScriptFlags(test["flags"].get_str());
+    script_verify_flags test_flags = ParseScriptFlags(test["flags"].get_str());
     bool final = test.exists("final") && test["final"].get_bool();
 
     if (test.exists("success")) {

src/test/fuzz/script_flags.cpp

@@ -22,12 +22,12 @@ FUZZ_TARGET(script_flags)
     try {
         const CTransaction tx(deserialize, TX_WITH_WITNESS, ds);
 
-        unsigned int verify_flags;
+        script_verify_flags verify_flags;
         ds >> verify_flags;
 
         if (!IsValidFlagCombination(verify_flags)) return;
 
-        unsigned int fuzzed_flags;
+        script_verify_flags fuzzed_flags;
         ds >> fuzzed_flags;
 
         std::vector<CTxOut> spent_outputs;

src/test/fuzz/signature_checker.cpp

@@ -51,7 +51,7 @@ public:
 FUZZ_TARGET(signature_checker)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
-    const unsigned int flags = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
+    const script_verify_flags flags = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
     const SigVersion sig_version = fuzzed_data_provider.PickValueInArray({SigVersion::BASE, SigVersion::WITNESS_V0});
     const auto script_1{ConsumeScript(fuzzed_data_provider)};
     const auto script_2{ConsumeScript(fuzzed_data_provider)};

src/test/multisig_tests.cpp

@@ -38,7 +38,7 @@ sign_multisig(const CScript& scriptPubKey, const std::vector<CKey>& keys, const
 
 BOOST_AUTO_TEST_CASE(multisig_verify)
 {
-    unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
+    script_verify_flags flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
 
     ScriptError err;
     CKey key[4];

src/test/script_assets_tests.cpp

@@ -25,7 +25,7 @@
 
 #include <univalue.h>
 
-unsigned int ParseScriptFlags(std::string strFlags);
+script_verify_flags ParseScriptFlags(std::string strFlags);
 
 BOOST_AUTO_TEST_SUITE(script_assets_tests)
 
@@ -71,12 +71,12 @@ static CScriptWitness ScriptWitnessFromJSON(const UniValue& univalue)
     return scriptwitness;
 }
 
-static std::vector<unsigned int> AllConsensusFlags()
+static std::vector<script_verify_flags> AllConsensusFlags()
 {
-    std::vector<unsigned int> ret;
+    std::vector<script_verify_flags> ret;
 
     for (unsigned int i = 0; i < 128; ++i) {
-        unsigned int flag = 0;
+        script_verify_flags flag = 0;
         if (i & 1) flag |= SCRIPT_VERIFY_P2SH;
         if (i & 2) flag |= SCRIPT_VERIFY_DERSIG;
         if (i & 4) flag |= SCRIPT_VERIFY_NULLDUMMY;
@@ -97,7 +97,7 @@ static std::vector<unsigned int> AllConsensusFlags()
 }
 
 /** Precomputed list of all valid combinations of consensus-relevant script validation flags. */
-static const std::vector<unsigned int> ALL_CONSENSUS_FLAGS = AllConsensusFlags();
+static const std::vector<script_verify_flags> ALL_CONSENSUS_FLAGS = AllConsensusFlags();
 
 static void AssetTest(const UniValue& test, SignatureCache& signature_cache)
 {
@@ -107,7 +107,7 @@ static void AssetTest(const UniValue& test, SignatureCache& signature_cache)
     const std::vector<CTxOut> prevouts = TxOutsFromJSON(test["prevouts"]);
     BOOST_CHECK(prevouts.size() == mtx.vin.size());
     size_t idx = test["index"].getInt<int64_t>();
-    uint32_t test_flags{ParseScriptFlags(test["flags"].get_str())};
+    script_verify_flags test_flags{ParseScriptFlags(test["flags"].get_str())};
     bool fin = test.exists("final") && test["final"].get_bool();
 
     if (test.exists("success")) {

src/test/script_tests.cpp

@@ -40,9 +40,9 @@
 
 using namespace util::hex_literals;
 
-static const unsigned int gFlags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
+static const script_verify_flags gFlags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
 
-unsigned int ParseScriptFlags(std::string strFlags);
+script_verify_flags ParseScriptFlags(std::string strFlags);
 
 struct ScriptErrorDesc
 {
@@ -120,7 +120,7 @@ static ScriptError_t ParseScriptError(const std::string& name)
 }
 
 struct ScriptTest : BasicTestingSetup {
-void DoTest(const CScript& scriptPubKey, const CScript& scriptSig, const CScriptWitness& scriptWitness, uint32_t flags, const std::string& message, int scriptError, CAmount nValue = 0)
+void DoTest(const CScript& scriptPubKey, const CScript& scriptSig, const CScriptWitness& scriptWitness, script_verify_flags flags, const std::string& message, int scriptError, CAmount nValue = 0)
 {
     bool expect = (scriptError == SCRIPT_ERR_OK);
     if (flags & SCRIPT_VERIFY_CLEANSTACK) {
@@ -232,7 +232,7 @@ private:
     bool havePush{false};
     std::vector<unsigned char> push;
     std::string comment;
-    uint32_t flags;
+    script_verify_flags flags;
     int scriptError{SCRIPT_ERR_OK};
     CAmount nValue;
 
@@ -252,7 +252,7 @@ private:
     }
 
 public:
-    TestBuilder(const CScript& script_, const std::string& comment_, uint32_t flags_, bool P2SH = false, WitnessMode wm = WitnessMode::NONE, int witnessversion = 0, CAmount nValue_ = 0) : script(script_), comment(comment_), flags(flags_), nValue(nValue_)
+    TestBuilder(const CScript& script_, const std::string& comment_, script_verify_flags flags_, bool P2SH = false, WitnessMode wm = WitnessMode::NONE, int witnessversion = 0, CAmount nValue_ = 0) : script(script_), comment(comment_), flags(flags_), nValue(nValue_)
     {
         CScript scriptPubKey = script;
         if (wm == WitnessMode::PKH) {
@@ -969,7 +969,7 @@ BOOST_AUTO_TEST_CASE(script_json_test)
         } else {
             scriptPubKey = ParseScript(scriptPubKeyString);
         }
-        unsigned int scriptflags = ParseScriptFlags(test[pos++].get_str());
+        script_verify_flags scriptflags = ParseScriptFlags(test[pos++].get_str());
         int scriptError = ParseScriptError(test[pos++].get_str());
 
         DoTest(scriptPubKey, scriptSig, witness, scriptflags, strTest, scriptError, nValue);

src/test/sigopcount_tests.cpp

@@ -69,7 +69,7 @@ BOOST_AUTO_TEST_CASE(GetSigOpCount)
  * Verifies script execution of the zeroth scriptPubKey of tx output and
  * zeroth scriptSig and witness of tx input.
  */
-static ScriptError VerifyWithFlag(const CTransaction& output, const CMutableTransaction& input, uint32_t flags)
+static ScriptError VerifyWithFlag(const CTransaction& output, const CMutableTransaction& input, script_verify_flags flags)
 {
     ScriptError error;
     CTransaction inputi(input);
@@ -122,7 +122,7 @@ BOOST_AUTO_TEST_CASE(GetTxSigOpCost)
     CKey key = GenerateRandomKey();
     CPubKey pubkey = key.GetPubKey();
     // Default flags
-    const uint32_t flags{SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH};
+    const script_verify_flags flags{SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH};
 
     // Multisig script (legacy counting)
     {

src/test/transaction_tests.cpp

@@ -52,9 +52,9 @@ static bool g_bare_multi{DEFAULT_PERMIT_BAREMULTISIG};
 
 static const std::map<std::string, unsigned int>& mapFlagNames = g_verify_flag_names;
 
-unsigned int ParseScriptFlags(std::string strFlags)
+script_verify_flags ParseScriptFlags(std::string strFlags)
 {
-    unsigned int flags = SCRIPT_VERIFY_NONE;
+    script_verify_flags flags = SCRIPT_VERIFY_NONE;
     if (strFlags.empty() || strFlags == "NONE") return flags;
 
     std::vector<std::string> words = SplitString(strFlags, ',');
@@ -72,7 +72,7 @@ unsigned int ParseScriptFlags(std::string strFlags)
 // Check that all flags in STANDARD_SCRIPT_VERIFY_FLAGS are present in mapFlagNames.
 bool CheckMapFlagNames()
 {
-    unsigned int standard_flags_missing{STANDARD_SCRIPT_VERIFY_FLAGS};
+    script_verify_flags standard_flags_missing{STANDARD_SCRIPT_VERIFY_FLAGS};
     for (const auto& pair : mapFlagNames) {
         standard_flags_missing &= ~(pair.second);
     }
@@ -83,7 +83,7 @@ bool CheckMapFlagNames()
 * Check that the input scripts of a transaction are valid/invalid as expected.
 */
 bool CheckTxScripts(const CTransaction& tx, const std::map<COutPoint, CScript>& map_prevout_scriptPubKeys,
-    const std::map<COutPoint, int64_t>& map_prevout_values, unsigned int flags,
+    const std::map<COutPoint, int64_t>& map_prevout_values, script_verify_flags flags,
     const PrecomputedTransactionData& txdata, const std::string& strTest, bool expect_valid)
 {
     bool tx_valid = true;
@@ -117,18 +117,18 @@ bool CheckTxScripts(const CTransaction& tx, const std::map<COutPoint, CScript>&
  * CLEANSTACK must be used WITNESS and P2SH
  */
 
-unsigned int TrimFlags(unsigned int flags)
+script_verify_flags TrimFlags(script_verify_flags flags)
 {
     // WITNESS requires P2SH
-    if (!(flags & SCRIPT_VERIFY_P2SH)) flags &= ~(unsigned int)SCRIPT_VERIFY_WITNESS;
+    if (!(flags & SCRIPT_VERIFY_P2SH)) flags &= ~SCRIPT_VERIFY_WITNESS;
 
     // CLEANSTACK requires WITNESS (and transitively CLEANSTACK requires P2SH)
-    if (!(flags & SCRIPT_VERIFY_WITNESS)) flags &= ~(unsigned int)SCRIPT_VERIFY_CLEANSTACK;
+    if (!(flags & SCRIPT_VERIFY_WITNESS)) flags &= ~SCRIPT_VERIFY_CLEANSTACK;
     Assert(IsValidFlagCombination(flags));
     return flags;
 }
 
-unsigned int FillFlags(unsigned int flags)
+script_verify_flags FillFlags(script_verify_flags flags)
 {
     // CLEANSTACK implies WITNESS
     if (flags & SCRIPT_VERIFY_CLEANSTACK) flags |= SCRIPT_VERIFY_WITNESS;
@@ -143,11 +143,11 @@ unsigned int FillFlags(unsigned int flags)
 // that are valid and without duplicates. For example: if flags=1111 and the 4 possible flags are
 // 0001, 0010, 0100, and 1000, this should return the set {0111, 1011, 1101, 1110}.
 // Assumes that mapFlagNames contains all script verify flags.
-std::set<unsigned int> ExcludeIndividualFlags(unsigned int flags)
+std::set<script_verify_flags> ExcludeIndividualFlags(script_verify_flags flags)
 {
-    std::set<unsigned int> flags_combos;
+    std::set<script_verify_flags> flags_combos;
     for (const auto& pair : mapFlagNames) {
-        const unsigned int flags_excluding_one = TrimFlags(flags & ~(pair.second));
+        script_verify_flags flags_excluding_one = TrimFlags(flags & ~(pair.second));
         if (flags != flags_excluding_one) {
             flags_combos.insert(flags_excluding_one);
         }
@@ -212,7 +212,7 @@ BOOST_AUTO_TEST_CASE(tx_valid)
             BOOST_CHECK(state.IsValid());
 
             PrecomputedTransactionData txdata(tx);
-            unsigned int verify_flags = ParseScriptFlags(test[2].get_str());
+            script_verify_flags verify_flags = ParseScriptFlags(test[2].get_str());
 
             // Check that the test gives a valid combination of flags (otherwise VerifyScript will throw). Don't edit the flags.
             if (~verify_flags != FillFlags(~verify_flags)) {
@@ -225,7 +225,7 @@ BOOST_AUTO_TEST_CASE(tx_valid)
             // Backwards compatibility of script verification flags: Removing any flag(s) should not invalidate a valid transaction
             for (const auto& [name, flag] : mapFlagNames) {
                 // Removing individual flags
-                unsigned int flags = TrimFlags(~(verify_flags | flag));
+                script_verify_flags flags = TrimFlags(~(verify_flags | flag));
                 if (!CheckTxScripts(tx, mapprevOutScriptPubKeys, mapprevOutValues, flags, txdata, strTest, /*expect_valid=*/true)) {
                     BOOST_ERROR("Tx unexpectedly failed with flag " << name << " unset: " << strTest);
                 }
@@ -302,7 +302,7 @@ BOOST_AUTO_TEST_CASE(tx_invalid)
             }
 
             PrecomputedTransactionData txdata(tx);
-            unsigned int verify_flags = ParseScriptFlags(test[2].get_str());
+            script_verify_flags verify_flags = ParseScriptFlags(test[2].get_str());
 
             // Check that the test gives a valid combination of flags (otherwise VerifyScript will throw). Don't edit the flags.
             if (verify_flags != FillFlags(verify_flags)) {
@@ -315,7 +315,7 @@ BOOST_AUTO_TEST_CASE(tx_invalid)
 
             // Backwards compatibility of script verification flags: Adding any flag(s) should not validate an invalid transaction
             for (const auto& [name, flag] : mapFlagNames) {
-                unsigned int flags = FillFlags(verify_flags | flag);
+                script_verify_flags flags = FillFlags(verify_flags | flag);
                 // Adding individual flags
                 if (!CheckTxScripts(tx, mapprevOutScriptPubKeys, mapprevOutValues, flags, txdata, strTest, /*expect_valid=*/false)) {
                     BOOST_ERROR("Tx unexpectedly passed with flag " << name << " set: " << strTest);
@@ -453,7 +453,7 @@ static void CreateCreditAndSpend(const FillableSigningProvider& keystore, const
     assert(input.vin[0].scriptWitness.stack == inputm.vin[0].scriptWitness.stack);
 }
 
-static void CheckWithFlag(const CTransactionRef& output, const CMutableTransaction& input, uint32_t flags, bool success)
+static void CheckWithFlag(const CTransactionRef& output, const CMutableTransaction& input, script_verify_flags flags, bool success)
 {
     ScriptError error;
     CTransaction inputi(input);

src/test/txvalidationcache_tests.cpp

@@ -21,7 +21,7 @@ struct Dersig100Setup : public TestChain100Setup {
 };
 
 bool CheckInputScripts(const CTransaction& tx, TxValidationState& state,
-                       const CCoinsViewCache& inputs, unsigned int flags, bool cacheSigStore,
+                       const CCoinsViewCache& inputs, script_verify_flags flags, bool cacheSigStore,
                        bool cacheFullScriptStore, PrecomputedTransactionData& txdata,
                        ValidationCache& validation_cache,
                        std::vector<CScriptCheck>* pvChecks) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
@@ -120,7 +120,7 @@ BOOST_FIXTURE_TEST_CASE(tx_mempool_block_doublespend, Dersig100Setup)
 // should fail.
 // Capture this interaction with the upgraded_nop argument: set it when evaluating
 // any script flag that is implemented as an upgraded NOP code.
-static void ValidateCheckInputsForAllFlags(const CTransaction &tx, uint32_t failing_flags, bool add_to_cache, CCoinsViewCache& active_coins_tip, ValidationCache& validation_cache) EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
+static void ValidateCheckInputsForAllFlags(const CTransaction &tx, script_verify_flags failing_flags, bool add_to_cache, CCoinsViewCache& active_coins_tip, ValidationCache& validation_cache) EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
 {
     PrecomputedTransactionData txdata;
 
@@ -130,7 +130,7 @@ static void ValidateCheckInputsForAllFlags(const CTransaction &tx, uint32_t fail
         TxValidationState state;
 
         // Randomly selects flag combinations
-        uint32_t test_flags = (uint32_t) insecure_rand.randrange((SCRIPT_VERIFY_END_MARKER - 1) << 1);
+        script_verify_flags test_flags = (uint32_t) insecure_rand.randrange((SCRIPT_VERIFY_END_MARKER - 1) << 1);
 
         // Filter out incompatible flag choices
         if ((test_flags & SCRIPT_VERIFY_CLEANSTACK)) {

src/test/util/script.cpp

@@ -5,7 +5,7 @@
 #include <script/interpreter.h>
 #include <test/util/script.h>
 
-bool IsValidFlagCombination(unsigned flags)
+bool IsValidFlagCombination(script_verify_flags flags)
 {
     if (flags & SCRIPT_VERIFY_CLEANSTACK && ~flags & (SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS)) return false;
     if (flags & SCRIPT_VERIFY_WITNESS && ~flags & SCRIPT_VERIFY_P2SH) return false;

src/test/util/script.h

@@ -7,6 +7,7 @@
 
 #include <crypto/sha256.h>
 #include <script/script.h>
+#include <script/verify_flags.h>
 
 static const std::vector<uint8_t> WITNESS_STACK_ELEM_OP_TRUE{uint8_t{OP_TRUE}};
 static const CScript P2WSH_OP_TRUE{
@@ -31,6 +32,6 @@ static const std::vector<std::vector<uint8_t>> P2WSH_EMPTY_TRUE_STACK{{static_ca
 static const std::vector<std::vector<uint8_t>> P2WSH_EMPTY_TWO_STACK{{static_cast<uint8_t>(OP_2)}, {}};
 
 /** Flags that are not forbidden by an assert in script validation */
-bool IsValidFlagCombination(unsigned flags);
+bool IsValidFlagCombination(script_verify_flags flags);
 
 #endif // BITCOIN_TEST_UTIL_SCRIPT_H

src/validation.cpp

@@ -139,7 +139,7 @@ const CBlockIndex* Chainstate::FindForkInGlobalIndex(const CBlockLocator& locato
 }
 
 bool CheckInputScripts(const CTransaction& tx, TxValidationState& state,
-                       const CCoinsViewCache& inputs, unsigned int flags, bool cacheSigStore,
+                       const CCoinsViewCache& inputs, script_verify_flags flags, bool cacheSigStore,
                        bool cacheFullScriptStore, PrecomputedTransactionData& txdata,
                        ValidationCache& validation_cache,
                        std::vector<CScriptCheck>* pvChecks = nullptr)
@@ -395,7 +395,7 @@ void Chainstate::MaybeUpdateMempoolForReorg(
 * */
 static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, TxValidationState& state,
                 const CCoinsViewCache& view, const CTxMemPool& pool,
-                unsigned int flags, PrecomputedTransactionData& txdata, CCoinsViewCache& coins_tip,
+                script_verify_flags flags, PrecomputedTransactionData& txdata, CCoinsViewCache& coins_tip,
                 ValidationCache& validation_cache)
                 EXCLUSIVE_LOCKS_REQUIRED(cs_main, pool.cs)
 {
@@ -1246,7 +1246,7 @@ bool MemPoolAccept::PolicyScriptChecks(const ATMPArgs& args, Workspace& ws)
     const CTransaction& tx = *ws.m_ptx;
     TxValidationState& state = ws.m_state;
 
-    constexpr unsigned int scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS;
+    constexpr script_verify_flags scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS;
 
     // Check input scripts and signatures.
     // This is done last to help prevent CPU exhaustion denial-of-service attacks.
@@ -1285,7 +1285,7 @@ bool MemPoolAccept::ConsensusScriptChecks(const ATMPArgs& args, Workspace& ws)
     // There is a similar check in CreateNewBlock() to prevent creating
     // invalid blocks (using TestBlockValidity), however allowing such
     // transactions into the mempool can be exploited as a DoS attack.
-    unsigned int currentBlockScriptVerifyFlags{GetBlockScriptFlags(*m_active_chainstate.m_chain.Tip(), m_active_chainstate.m_chainman)};
+    script_verify_flags currentBlockScriptVerifyFlags{GetBlockScriptFlags(*m_active_chainstate.m_chain.Tip(), m_active_chainstate.m_chainman)};
     if (!CheckInputsFromMempoolAndCache(tx, state, m_view, m_pool, currentBlockScriptVerifyFlags,
                                         ws.m_precomputed_txdata, m_active_chainstate.CoinsTip(), GetValidationCache())) {
         LogPrintf("BUG! PLEASE REPORT THIS! CheckInputScripts failed against latest-block but not STANDARD flags %s, %s\n", hash.ToString(), state.ToString());
@@ -2093,7 +2093,7 @@ std::optional<std::pair<ScriptError, std::string>> CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     const CScriptWitness *witness = &ptxTo->vin[nIn].scriptWitness;
     ScriptError error{SCRIPT_ERR_UNKNOWN_ERROR};
-    if (VerifyScript(scriptSig, m_tx_out.scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, m_tx_out.nValue, cacheStore, *m_signature_cache, *txdata), &error)) {
+    if (VerifyScript(scriptSig, m_tx_out.scriptPubKey, witness, m_flags, CachingTransactionSignatureChecker(ptxTo, nIn, m_tx_out.nValue, cacheStore, *m_signature_cache, *txdata), &error)) {
         return std::nullopt;
     } else {
         auto debug_str = strprintf("input %i of %s (wtxid %s), spending %s:%i", nIn, ptxTo->GetHash().ToString(), ptxTo->GetWitnessHash().ToString(), ptxTo->vin[nIn].prevout.hash.ToString(), ptxTo->vin[nIn].prevout.n);
@@ -2137,7 +2137,7 @@ ValidationCache::ValidationCache(const size_t script_execution_cache_bytes, cons
  * Non-static (and redeclared) in src/test/txvalidationcache_tests.cpp
  */
 bool CheckInputScripts(const CTransaction& tx, TxValidationState& state,
-                       const CCoinsViewCache& inputs, unsigned int flags, bool cacheSigStore,
+                       const CCoinsViewCache& inputs, script_verify_flags flags, bool cacheSigStore,
                        bool cacheFullScriptStore, PrecomputedTransactionData& txdata,
                        ValidationCache& validation_cache,
                        std::vector<CScriptCheck>* pvChecks)
@@ -2325,7 +2325,7 @@ DisconnectResult Chainstate::DisconnectBlock(const CBlock& block, const CBlockIn
     return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
 }
 
-unsigned int GetBlockScriptFlags(const CBlockIndex& block_index, const ChainstateManager& chainman)
+script_verify_flags GetBlockScriptFlags(const CBlockIndex& block_index, const ChainstateManager& chainman)
 {
     const Consensus::Params& consensusparams = chainman.GetConsensus();
 
@@ -2337,7 +2337,7 @@ unsigned int GetBlockScriptFlags(const CBlockIndex& block_index, const Chainstat
     // mainnet.
     // For simplicity, always leave P2SH+WITNESS+TAPROOT on except for the two
     // violating blocks.
-    uint32_t flags{SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_TAPROOT};
+    script_verify_flags flags{SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_TAPROOT};
     const auto it{consensusparams.script_flag_exceptions.find(*Assert(block_index.phashBlock))};
     if (it != consensusparams.script_flag_exceptions.end()) {
         flags = it->second;
@@ -2551,7 +2551,7 @@ bool Chainstate::ConnectBlock(const CBlock& block, BlockValidationState& state,
     }
 
     // Get the script flags for this block
-    unsigned int flags{GetBlockScriptFlags(*pindex, m_chainman)};
+    script_verify_flags flags{GetBlockScriptFlags(*pindex, m_chainman)};
 
     const auto time_2{SteadyClock::now()};
     m_chainman.time_forks += time_2 - time_1;

src/validation.h

@@ -23,6 +23,7 @@
 #include <policy/policy.h>
 #include <script/script_error.h>
 #include <script/sigcache.h>
+#include <script/verify_flags.h>
 #include <sync.h>
 #include <txdb.h>
 #include <txmempool.h>
@@ -336,14 +337,14 @@ private:
     CTxOut m_tx_out;
     const CTransaction *ptxTo;
     unsigned int nIn;
-    unsigned int nFlags;
+    script_verify_flags m_flags;
     bool cacheStore;
     PrecomputedTransactionData *txdata;
     SignatureCache* m_signature_cache;
 
 public:
-    CScriptCheck(const CTxOut& outIn, const CTransaction& txToIn, SignatureCache& signature_cache, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
+    CScriptCheck(const CTxOut& outIn, const CTransaction& txToIn, SignatureCache& signature_cache, unsigned int nInIn, script_verify_flags flags, bool cacheIn, PrecomputedTransactionData* txdataIn) :
-        m_tx_out(outIn), ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), txdata(txdataIn), m_signature_cache(&signature_cache) { }
+        m_tx_out(outIn), ptxTo(&txToIn), nIn(nInIn), m_flags(flags), cacheStore(cacheIn), txdata(txdataIn), m_signature_cache(&signature_cache) { }
 
     CScriptCheck(const CScriptCheck&) = delete;
     CScriptCheck& operator=(const CScriptCheck&) = delete;
@@ -1359,6 +1360,6 @@ bool IsBIP30Repeat(const CBlockIndex& block_index);
 bool IsBIP30Unspendable(const uint256& block_hash, int block_height);
 
 // Returns the script flags which should be checked for a given block
-unsigned int GetBlockScriptFlags(const CBlockIndex& block_index, const ChainstateManager& chainman);
+script_verify_flags GetBlockScriptFlags(const CBlockIndex& block_index, const ChainstateManager& chainman);
 
 #endif // BITCOIN_VALIDATION_H