From 21bcfbc0b7355e920a56e4348b7b51c64f746a87 Mon Sep 17 00:00:00 2001
From: Daniel Wang <dan@taiko.xyz>
Date: Wed, 13 Mar 2024 16:11:46 +0800
Subject: [PATCH] Taiko L2 offers parentTimestamp

---
 packages/protocol/contracts/L2/TaikoL2.sol | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/protocol/contracts/L2/TaikoL2.sol b/packages/protocol/contracts/L2/TaikoL2.sol
index 99f5f7e362..4dd7c2085b 100644
--- a/packages/protocol/contracts/L2/TaikoL2.sol
+++ b/packages/protocol/contracts/L2/TaikoL2.sol
@@ -49,6 +49,12 @@ contract TaikoL2 is CrossChainOwned {
     /// @notice The last synced L1 block height.
     uint64 public lastSyncedBlock;
 
+    /// @notice The parent block's timestamp.
+    uint64 public parentTimestamp;
+
+    /// @notice The current block's timestamp.
+    uint64 private __currentBlockTimestamp;
+
     uint256[47] private __gap;
 
     /// @notice Emitted when the latest L1 block details are anchored to L2.
@@ -95,6 +101,7 @@ contract TaikoL2 is CrossChainOwned {
 
         gasExcess = _gasExcess;
         (publicInputHash,) = _calcPublicInputHash(block.number);
+        __currentBlockTimestamp = uint64(block.timestamp);
     }
 
     /// @notice Anchors the latest L1 block details to L2 for cross-layer
@@ -154,6 +161,9 @@ contract TaikoL2 is CrossChainOwned {
         l2Hashes[parentId] = blockhash(parentId);
         publicInputHash = publicInputHashNew;
 
+        parentTimestamp = __currentBlockTimestamp;
+        __currentBlockTimestamp = uint64(block.timestamp);
+
         emit Anchored(blockhash(parentId), gasExcess);
     }