diff --git a/.travis.yml b/.travis.yml
index ce00fd616..5dcf19297 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -78,6 +78,8 @@ before_script:
   - if [ "${COVERAGE}" != "true" ] && [ "$TRAVIS_PHP_VERSION" != "hhvm" ] && [ "$TRAVIS_PHP_VERSION" != "nightly" ]; then phpenv config-rm xdebug.ini && echo "xdebug disabled"; fi
 
 script:
+  - vendor/bin/phpunit --filter 'TaprootTest::testScript#20'
+  - vendor/bin/phpunit --filter 'TaprootTest::testScript#21'
   - travis/run_secp256k1_tests.sh || exit 1
   - if [ "$COVERAGE" = "true" ]; then pwd && vendor/bin/phpstan analyse src tests -l 1; fi
   - make phpunit-ci || exit 1
diff --git a/src/Script/Interpreter/Interpreter.php b/src/Script/Interpreter/Interpreter.php
index 4d35454b7..55e003559 100644
--- a/src/Script/Interpreter/Interpreter.php
+++ b/src/Script/Interpreter/Interpreter.php
@@ -295,10 +295,12 @@ private function verifyWitnessProgram(WitnessProgram $witnessProgram, ScriptWitn
             }
 
             if ($witnessCount === 0) {
+                echo "empty witness\n";
                 return false;
             } else if ($witnessCount >= 2 && $scriptWitness->bottom()->getSize() > 0 && ord($scriptWitness->bottom()->getBinary()[0]) === TaprootHasher::TAPROOT_ANNEX_BYTE) {
                 $annex = $scriptWitness->bottom();
                 if (($flags & self::VERIFY_DISCOURAGE_UPGRADABLE_ANNEX)) {
+                    echo "uigradable annex\n";
                     return false;
                 }
                 $execContext->setAnnexHash(Hash::sha256($annex));
@@ -311,6 +313,7 @@ private function verifyWitnessProgram(WitnessProgram $witnessProgram, ScriptWitn
                 // key spend path - doesn't use the interpreter, directly checks signature
                 $signature = $scriptWitness[count($scriptWitness) - 1];
                 if (!$checker->checkSigSchnorr($signature, $witnessProgram->getProgram(), SigHash::TAPROOT, $execContext)) {
+                    echo "invalid signature\n";
                     return false;
                 }
                 return true;
@@ -329,11 +332,13 @@ private function verifyWitnessProgram(WitnessProgram $witnessProgram, ScriptWitn
                 if ($control->getSize() < TAPROOT_CONTROL_BASE_SIZE ||
                     $control->getSize() > TAPROOT_CONTROL_MAX_SIZE ||
                     (($control->getSize() - TAPROOT_CONTROL_BASE_SIZE) % TAPROOT_CONTROL_BRANCH_SIZE !== 0)) {
+                    echo "invalid control size\n";
                     return false;
                 }
 
                 $leafHash = null;
                 if (!$this->verifyTaprootCommitment($control, $witnessProgram->getProgram(), $scriptPubKey, $leafHash)) {
+                    echo "invalid taproot commitment\n";
                     return false;
                 }
                 $execContext->setTapLeafHash($leafHash);
@@ -344,11 +349,15 @@ private function verifyWitnessProgram(WitnessProgram $witnessProgram, ScriptWitn
                 }
 
                 // return true at this stage, need further work to proceed
-                return $this->executeWitnessProgram($scriptWitness, new Script($scriptPubKey), SigHash::TAPSCRIPT, $flags, $checker, $execContext);
+                $ret = $this->executeWitnessProgram($scriptWitness, new Script($scriptPubKey), SigHash::TAPSCRIPT, $flags, $checker, $execContext);
+                var_dump("witnessExec");
+                var_dump($ret);
+                return $ret;
             }
         }
 
         if ($flags & self::VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM) {
+            echo "upgradable witness program\n";
             return false;
         }
 
@@ -614,9 +623,9 @@ public function evaluate(ScriptInterface $script, Stack $mainStack, int $sigVers
                     }
 
                     $mainStack->push($pushData);
-                    // echo " - [pushed '" . $pushData->getHex() . "']\n";
+                     echo " - [pushed '" . $pushData->getHex() . "']\n";
                 } elseif ($fExec || (Opcodes::OP_IF <= $opCode && $opCode <= Opcodes::OP_ENDIF)) {
-                    // echo "OPCODE - " . $script->getOpcodes()->getOp($opCode) . "\n";
+                     echo "OPCODE - " . $script->getOpcodes()->getOp($opCode) . "\n";
                     switch ($opCode) {
                         case Opcodes::OP_1NEGATE:
                         case Opcodes::OP_1:
@@ -1248,11 +1257,11 @@ public function evaluate(ScriptInterface $script, Stack $mainStack, int $sigVers
 
             return true;
         } catch (ScriptRuntimeException $e) {
-            // echo "\n Runtime: " . $e->getMessage() . "\n" . $e->getTraceAsString() . PHP_EOL;
+             echo "\n Runtime: " . $e->getMessage() . "\n" . $e->getTraceAsString() . PHP_EOL;
             // Failure due to script tags, can access flag: $e->getFailureFlag()
             return false;
         } catch (\Exception $e) {
-            // echo "\n General: " . $e->getMessage()  . PHP_EOL . $e->getTraceAsString() . PHP_EOL;
+             echo "\n General: " . $e->getMessage()  . PHP_EOL . $e->getTraceAsString() . PHP_EOL;
             return false;
         }
     }