diff --git a/test/python/test_instructions.py b/test/python/test_instructions.py
index 253a0da3..7e5c58f0 100644
--- a/test/python/test_instructions.py
+++ b/test/python/test_instructions.py
@@ -16,6 +16,7 @@
 from utils.message import (
     Preattestation,
     Attestation,
+    AttestationDal,
     Fitness,
     BlockHeader,
     Block
@@ -397,6 +398,52 @@ def test_sign_attestation(
         account.check_signature(signature, bytes(attestation))
 
 
+@pytest.mark.parametrize("account", [DEFAULT_ACCOUNT])
+@pytest.mark.parametrize("with_hash", [False, True])
+def test_sign_attestation_dal(
+        account: Account,
+        with_hash: bool,
+        client: TezosClient,
+        firmware: Firmware,
+        navigator: Navigator) -> None:
+    """Test the SIGN(_WITH_HASH) instruction on attestation."""
+
+    main_chain_id: int = 0
+    main_hwm = Hwm(0)
+    test_hwm = Hwm(0)
+
+    instructions = get_setup_app_context_instructions(firmware)
+
+    send_and_navigate(
+        send=lambda: client.setup_app_context(
+            account,
+            main_chain_id,
+            main_hwm,
+            test_hwm),
+        navigate=lambda: navigator.navigate(instructions))
+
+    attestation = AttestationDal(
+        chain_id=main_chain_id,
+        branch="0000000000000000000000000000000000000000000000000000000000000000",
+        slot=0,
+        op_level=0,
+        op_round=0,
+        block_payload_hash="0000000000000000000000000000000000000000000000000000000000000000",
+        dal_message="000000000000000000000000000000000000000000000000000000000000000000000000000"
+    )
+
+    if with_hash:
+        signature = client.sign_message(account, attestation)
+        account.check_signature(signature, bytes(attestation))
+    else:
+        attestation_hash, signature = client.sign_message_with_hash(account, attestation)
+        assert attestation_hash == attestation.hash, \
+            f"Expected hash {attestation.hash.hex()} but got {attestation_hash.hex()}"
+        account.check_signature(signature, bytes(attestation))
+
+
+
+
 @pytest.mark.parametrize("account", [DEFAULT_ACCOUNT])
 @pytest.mark.parametrize("with_hash", [False, True])
 def test_sign_block(
diff --git a/test/python/utils/message.py b/test/python/utils/message.py
index 69c10d22..341f1acd 100644
--- a/test/python/utils/message.py
+++ b/test/python/utils/message.py
@@ -81,18 +81,19 @@ class ConsensusProtocol(IntEnum):
 class OperationTag(IntEnum):
     """Class representing the operation tag."""
 
-    PROPOSAL            = 5
-    BALLOT              = 6
-    BABYLON_REVEAL      = 107
-    BABYLON_TRANSACTION = 108
-    BABYLON_ORIGINATION = 109
-    BABYLON_DELEGATION  = 110
-    ATHENS_REVEAL       = 7
-    ATHENS_TRANSACTION  = 8
-    ATHENS_ORIGINATION  = 9
-    ATHENS_DELEGATION   = 10
-    PREATTESTATION      = 20
-    ATTESTATION         = 21
+    PROPOSAL             = 5
+    BALLOT               = 6
+    BABYLON_REVEAL       = 107
+    BABYLON_TRANSACTION  = 108
+    BABYLON_ORIGINATION  = 109
+    BABYLON_DELEGATION   = 110
+    ATHENS_REVEAL        = 7
+    ATHENS_TRANSACTION   = 8
+    ATHENS_ORIGINATION   = 9
+    ATHENS_DELEGATION    = 10
+    PREATTESTATION       = 20
+    ATTESTATION          = 21
+    ATTESTATION_WITH_DAL = 23
 
 class Preattestation(Message):
     """Class representing a preattestation."""
@@ -168,6 +169,46 @@ def raw(self) -> bytes:
         raw += self.block_payload_hash
         return raw
 
+class AttestationDal(Message):
+    """Class representing an attestation + DAL."""
+    chain_id: int
+    branch: bytes
+    slot: int
+    op_level: int
+    op_round: int
+    block_payload_hash: bytes
+    dal_message: bytes
+
+    def __init__(self,
+                 chain_id: int,
+                 branch: Union[str,bytes],
+                 slot: int,
+                 op_level: int,
+                 op_round: int,
+                 block_payload_hash: Union[str,bytes],
+                 dal_message: Union[str,bytes]):
+        self.chain_id = chain_id
+        self.branch = scrub(branch)
+        assert_data_size("branch", self.branch, 32)
+        self.slot = slot
+        self.op_level = op_level
+        self.op_round = op_round
+        self.block_payload_hash = scrub(block_payload_hash)
+        assert_data_size("block_payload_hash", self.block_payload_hash, 32)
+        self.dal_message = scrub(dal_message)
+
+    def raw(self) -> bytes:
+        raw = b''
+        raw += MagicByte.TENDERBAKE_ENDORSEMENT.to_bytes(1, byteorder='big')
+        raw += self.chain_id.to_bytes(4, byteorder='big')
+        raw += self.branch
+        raw += OperationTag.ATTESTATION_WITH_DAL.to_bytes(1, byteorder='big')
+        raw += self.slot.to_bytes(2, byteorder='big')
+        raw += self.op_level.to_bytes(4, byteorder='big')
+        raw += self.op_round.to_bytes(4, byteorder='big')
+        raw += self.block_payload_hash
+        return raw
+
 class Fitness:
     """Class representing a fitness."""
     level: int