diff --git a/pyproject.toml b/pyproject.toml
index b1f91345..1650588c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,13 +18,13 @@ schema = "^0.7.5"
 websocket-client = "^1.4.1"
 confluent-kafka = "^2.2.0"
 web3 = "^6.10.0"
-pre-commit = "^3.8.0"
 
 [tool.poetry.group.dev.dependencies]
 ruff = "^0.4.4"
 pytest = "^8.2.0"
 pytest-cov = "^5.0.0"
 pyright = "^1.1.362"
+pre-commit = "^3.8.0"
 
 [tool.pytest.ini_options]
 pythonpath = [
diff --git a/src/cryptography/verify_signature.py b/src/cryptography/verify_signature.py
index a8863e2d..2384a393 100644
--- a/src/cryptography/verify_signature.py
+++ b/src/cryptography/verify_signature.py
@@ -35,6 +35,7 @@ def recover_vs(vs: str) -> tuple[VRS, VRS]:
 def compute_vs(v: int, s: str) -> str:
     """Returns aggregated _vs value."""
     if v < V_OFFSET and v not in [0, 1]:
+        logger.error({'msg': 'Signature invalid v byte.', 'data': str(v)})
         raise ValueError('Signature invalid v byte.')
     if v < V_OFFSET:
         v += V_OFFSET
diff --git a/src/transport/msg_types/common.py b/src/transport/msg_types/common.py
index aa038e81..863e39dd 100644
--- a/src/transport/msg_types/common.py
+++ b/src/transport/msg_types/common.py
@@ -5,6 +5,7 @@
 from cryptography.verify_signature import recover_vs, verify_message_with_signature
 from eth_account.account import VRS
 from metrics.metrics import UNEXPECTED_EXCEPTIONS
+from transport.msg_providers.rabbit import MessageType
 from transport.msg_types.deposit import DepositMessage
 from transport.msg_types.pause import PauseMessage
 from transport.msg_types.unvet import UnvetMessage
@@ -46,11 +47,11 @@ def _vrs(msg: DepositMessage | PauseMessage | UnvetMessage) -> tuple[VRS, VRS, V
 
 def _select_label(msg: DepositMessage | PauseMessage | UnvetMessage) -> str:
     t = msg['type']
-    if t == 'pause':
+    if t == MessageType.PAUSE:
         return 'pause_message_verification_failed'
-    elif t == 'unvet':
-        return 'get_unvet_messages_sign_filter'
-    elif t == 'deposit':
+    elif t == MessageType.UNVET:
+        return 'unvet_message_verification_failed'
+    elif t == MessageType.DEPOSIT:
         return 'deposit_message_verification_failed'
     else:
         raise ValueError('Unsupported message type')
@@ -58,13 +59,13 @@ def _select_label(msg: DepositMessage | PauseMessage | UnvetMessage) -> str:
 
 def _verification_data(web3: Web3, msg: DepositMessage | PauseMessage | UnvetMessage) -> tuple[List[Any], List[str]]:
     t = msg['type']
-    if t == 'pause':
+    if t == MessageType.PAUSE:
         prefix = web3.lido.deposit_security_module.get_pause_message_prefix()
         return _verification_data_pause(prefix, msg)
-    elif t == 'unvet':
+    elif t == MessageType.UNVET:
         prefix = web3.lido.deposit_security_module.get_unvet_message_prefix()
         return _verification_data_unvet(prefix, msg)
-    elif t == 'deposit':
+    elif t == MessageType.DEPOSIT:
         prefix = web3.lido.deposit_security_module.get_attest_message_prefix()
         return _verification_data_deposit(prefix, msg)
     else: