diff --git a/packages/protocol/contracts/L1/TaikoEvents.sol b/packages/protocol/contracts/L1/TaikoEvents.sol
index 618b0f9f22..4259ae8361 100644
--- a/packages/protocol/contracts/L1/TaikoEvents.sol
+++ b/packages/protocol/contracts/L1/TaikoEvents.sol
@@ -26,6 +26,11 @@ abstract contract TaikoEvents {
         TaikoData.EthDeposit[] depositsProcessed
     );
 
+    /// @notice Emitted when a block's txList is in the calldata.
+    /// @param blockId The ID of the proposed block.
+    /// @param txList The txList.
+    event CalldataTxList(uint256 indexed blockId, bytes txList);
+
     /// @dev Emitted when a block is verified.
     /// @param blockId The ID of the verified block.
     /// @param prover The prover whose transition is used for verifying the
diff --git a/packages/protocol/contracts/L1/libs/LibProposing.sol b/packages/protocol/contracts/L1/libs/LibProposing.sol
index 10c36e0bd5..db07f7c34d 100644
--- a/packages/protocol/contracts/L1/libs/LibProposing.sol
+++ b/packages/protocol/contracts/L1/libs/LibProposing.sol
@@ -32,6 +32,11 @@ library LibProposing {
         TaikoData.EthDeposit[] depositsProcessed
     );
 
+    /// @notice Emitted when a block's txList is in the calldata.
+    /// @param blockId The ID of the proposed block.
+    /// @param txList The txList.
+    event CalldataTxList(uint256 indexed blockId, bytes txList);
+
     // Warning: Any errors defined here must also be defined in TaikoErrors.sol.
     error L1_BLOB_NOT_AVAILABLE();
     error L1_BLOB_NOT_FOUND();
@@ -130,6 +135,8 @@ library LibProposing {
             ) {
                 revert L1_INVALID_SIG();
             }
+
+            emit CalldataTxList(meta_.id, _txList);
         }
 
         // Following the Merge, the L1 mixHash incorporates the