diff --git a/iconservice/icon_service_engine.py b/iconservice/icon_service_engine.py
index 0f0e0012b..6ec7ad01b 100644
--- a/iconservice/icon_service_engine.py
+++ b/iconservice/icon_service_engine.py
@@ -454,7 +454,8 @@ def invoke(self,
             tx_timer.start()
 
             for index, tx_request in enumerate(tx_requests):
-                Logger.debug(_TAG, f"INVOKE tx: {tx_request}")
+                tx_hash: Optional[bytes] = tx_request["params"].get("txHash")
+                Logger.debug(_TAG, f"INVOKE tx: tx_hash={bytes_to_hex(tx_hash)} {tx_request}")
 
                 # Adjust the number of transactions in a block to make sure that
                 # a leader can broadcast a block candidate to validators in a specific period.
diff --git a/iconservice/iconscore/icon_score_result.py b/iconservice/iconscore/icon_score_result.py
index 2cb7d7601..e9411c593 100644
--- a/iconservice/iconscore/icon_score_result.py
+++ b/iconservice/iconscore/icon_score_result.py
@@ -21,6 +21,7 @@
 from ..base.block import Block
 from ..base.exception import ExceptionCode
 from ..icon_constant import DATA_BYTE_ORDER
+from ..utils import bytes_to_hex
 from ..utils.bloom import BloomFilter
 
 if TYPE_CHECKING:
@@ -98,7 +99,13 @@ def __init__(
         self.traces = None
 
     def __str__(self) -> str:
-        return '\n'.join([f'{k}: {v}' for k, v in self.__dict__.items()])
+        def func():
+            for k, v in self.__dict__.items():
+                if isinstance(v, bytes):
+                    v = bytes_to_hex(v)
+                yield f'{k}: {v}'
+
+        return '\n'.join(func())
 
     def to_dict(self, casing: Optional[callable] = None) -> dict:
         """