add firstBlobIndex

packages/protocol/contracts/layer1/based/ITaikoInbox.sol

@@ -18,7 +18,14 @@ import "src/shared/based/LibSharedData.sol";
 /// @custom:security-contact [email protected]
 interface ITaikoInbox {
     struct BlockParams {
+        // the max nubmer of transactions in this block. Note that if there are not enough
+        // transactions in calldata or blobs, the block will contains as many transactions as
+        // possible.
         uint16 numTransactions;
+        // For the first block in a batch,  the block timestamp is the batch params' `timestamp`
+        // plus this time shift value;
+        // For all other blocks in the same batch, the block timestamp is its parent block's
+        // timestamp plus this time shift value.
         uint8 timeThift;
     }
 
@@ -31,9 +38,14 @@ interface ITaikoInbox {
         uint64 timestamp;
         uint32 txListOffset;
         uint32 txListSize;
+        // The index of the first blob in this batch.
+        uint8 firstBlobIndex;
+        // The number of blobs in this batch. Blobs are initially concatenated and subsequently
+        // decompressed via Zlib.
         uint8 numBlobs;
         bool revertIfNotFirstProposal;
         bytes32[] signalSlots;
+        // Specifies the number of blocks to be generated from this batch.
         BlockParams[] blocks;
     }
 

packages/protocol/contracts/layer1/based/TaikoInbox.sol

@@ -126,7 +126,9 @@ abstract contract TaikoInbox is EssentialContract, ITaikoInbox, ITaiko, IFork {
         // the following approach to calculate a block's difficulty:
         //  `keccak256(abi.encode("TAIKO_DIFFICULTY", block.number))`
         meta_ = BatchMetadata({
-            txListHash: calldataUsed ? keccak256(_txList) : _calcTxListHash(params.numBlobs),
+            txListHash: calldataUsed
+                ? keccak256(_txList)
+                : _calcTxListHash(params.firstBlobIndex, params.numBlobs),
             extraData: bytes32(uint256(config.baseFeeConfig.sharingPctg)),
             coinbase: params.coinbase,
             batchId: stats2.numBatches,
@@ -457,10 +459,18 @@ abstract contract TaikoInbox is EssentialContract, ITaikoInbox, ITaiko, IFork {
         state.stats2.paused = true;
     }
 
-    function _calcTxListHash(uint8 _numBlobs) internal view virtual returns (bytes32) {
+    function _calcTxListHash(
+        uint8 _firstBlobIndex,
+        uint8 _numBlobs
+    )
+        internal
+        view
+        virtual
+        returns (bytes32)
+    {
         bytes32[] memory blobHashes = new bytes32[](_numBlobs);
         for (uint256 i; i < _numBlobs; ++i) {
-            blobHashes[i] = blobhash(i);
+            blobHashes[i] = blobhash(_firstBlobIndex + i);
             require(blobHashes[i] != 0, BlobNotFound());
         }
         return keccak256(abi.encode(blobHashes));

packages/protocol/test/layer1/Layer1Test.sol

@@ -31,7 +31,7 @@ contract ConfigurableInbox is TaikoInbox {
         return __config;
     }
 
-    function _calcTxListHash(uint8) internal pure override returns (bytes32) {
+    function _calcTxListHash(uint8, uint8) internal pure override returns (bytes32) {
         return keccak256("BLOB");
     }
 }