Enforce zk-SNARK validity during consensus.

src/test/sighash_tests.cpp

@@ -227,6 +227,7 @@ BOOST_AUTO_TEST_CASE(sighash_from_data)
           stream >> tx;
 
           CValidationState state;
+          state.SetPerformPourVerification(false); // don't verify the snark
           BOOST_CHECK_MESSAGE(CheckTransaction(tx, state), strTest);
           BOOST_CHECK(state.IsValid());
 

src/test/transaction_tests.cpp

@@ -391,6 +391,9 @@ BOOST_AUTO_TEST_CASE(test_simple_pour_invalidity)
         // pours.
         CMutableTransaction newTx(tx);
         CValidationState state;
+
+        state.SetPerformPourVerification(false); // don't verify the snark
+
         // No pours, vin and vout, means it should be invalid.
         BOOST_CHECK(!CheckTransaction(newTx, state));
         BOOST_CHECK(state.GetRejectReason() == "bad-txns-vin-empty");