1 files changed, 19 insertions, 7 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index 06b9b36fca..423b93479a 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1532,14 +1532,21 @@ bool CheckInputScripts(const CTransaction& tx, TxValidationState &state, const C
         return true;
     }
 
-    if (!txdata.m_ready) {
-        txdata.Init(tx);
+    if (!txdata.m_spent_outputs_ready) {
+        std::vector<CTxOut> spent_outputs;
+        spent_outputs.reserve(tx.vin.size());
+
+        for (const auto& txin : tx.vin) {
+            const COutPoint& prevout = txin.prevout;
+            const Coin& coin = inputs.AccessCoin(prevout);
+            assert(!coin.IsSpent());
+            spent_outputs.emplace_back(coin.out);
+        }
+        txdata.Init(tx, std::move(spent_outputs));
     }
+    assert(txdata.m_spent_outputs.size() == tx.vin.size());
 
     for (unsigned int i = 0; i < tx.vin.size(); i++) {
-        const COutPoint &prevout = tx.vin[i].prevout;
-        const Coin& coin = inputs.AccessCoin(prevout);
-        assert(!coin.IsSpent());
 
         // We very carefully only pass in things to CScriptCheck which
         // are clearly committed to by tx' witness hash. This provides
@@ -1548,7 +1555,7 @@ bool CheckInputScripts(const CTransaction& tx, TxValidationState &state, const C
         // spent being checked as a part of CScriptCheck.
 
         // Verify signature
-        CScriptCheck check(coin.out, tx, i, flags, cacheSigStore, &txdata);
+        CScriptCheck check(txdata.m_spent_outputs[i], tx, i, flags, cacheSigStore, &txdata);
         if (pvChecks) {
             pvChecks->push_back(CScriptCheck());
             check.swap(pvChecks->back());
@@ -1562,7 +1569,7 @@ bool CheckInputScripts(const CTransaction& tx, TxValidationState &state, const C
                 // splitting the network between upgraded and
                 // non-upgraded nodes by banning CONSENSUS-failing
                 // data providers.
-                CScriptCheck check2(coin.out, tx, i,
+                CScriptCheck check2(txdata.m_spent_outputs[i], tx, i,
                         flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, cacheSigStore, &txdata);
                 if (check2())
                     return state.Invalid(TxValidationResult::TX_NOT_STANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError())));
@@ -1907,6 +1914,11 @@ static unsigned int GetBlockScriptFlags(const CBlockIndex* pindex, const Consens
         flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
     }
 
+    // Start enforcing Taproot using versionbits logic.
+    if (VersionBitsState(pindex->pprev, consensusparams, Consensus::DEPLOYMENT_TAPROOT, versionbitscache) == ThresholdState::ACTIVE) {
+        flags |= SCRIPT_VERIFY_TAPROOT;
+    }
+
     // Start enforcing BIP147 NULLDUMMY (activated simultaneously with segwit)
     if (IsWitnessEnabled(pindex->pprev, consensusparams)) {
         flags |= SCRIPT_VERIFY_NULLDUMMY;