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feat(protocol): allow L2 contracts to read L2's parent block timestamp #16425

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merged 2 commits into from
Mar 13, 2024
Merged

feat(protocol): allow L2 contracts to read L2's parent block timestamp #16425

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21bcfbc
Taiko L2 offers parentTimestamp
dantaik Mar 13, 2024
780a191
Merge branch 'main' into L2-parent-time
dantaik Mar 13, 2024
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10 changes: 10 additions & 0 deletions packages/protocol/contracts/L2/TaikoL2.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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);
}

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