diff --git a/test/zkbob/ABIDecoder.t.sol b/test/zkbob/ABIDecoder.t.sol
new file mode 100644
index 0000000..f4a69c6
--- /dev/null
+++ b/test/zkbob/ABIDecoder.t.sol
@@ -0,0 +1,177 @@
+pragma solidity 0.8.15;
+
+import "forge-std/Test.sol";
+import "forge-std/console2.sol";
+
+import {SequencerABIDecoder} from "../../src/zkbob/sequencer/SequencerABIDecoder.sol";
+
+contract DummyParser is SequencerABIDecoder {
+    function _root() internal view override returns (uint256) {
+        return uint256(0);
+    }
+
+    function _pool_id() internal view override returns (uint256) {
+        return uint256(0);
+    }
+
+    function parseCommitCalldata()
+        external
+        returns (
+            uint256 nullifier,
+            uint256 outCommit,
+            // uint48 transferIndex,
+            uint256 transferDelta,
+            // int64 tokenAmount,
+            // uint256[8] calldata transferProof,
+            // uint16 txType,
+            bytes calldata memo
+        )
+    {
+        (
+            nullifier,
+            outCommit,
+            ,// transferIndex,
+            transferDelta,
+            ,// tokenAmount,
+            ,//trasgerProof
+            ,// txType,
+            memo
+        ) = _parseCommitCalldata();
+    }
+}
+uint256 constant transfer_delta_mask = (1 << (28 * 8)) - 1;
+
+contract ABIDecoder is Test {
+    address _parser;
+
+    function setUp() external {
+        DummyParser parser = new DummyParser();
+        _parser = address(parser);
+    }
+
+    function _randFR() internal view returns (uint256) {
+        return
+            uint256(keccak256(abi.encode(gasleft()))) %
+            21888242871839275222246405745257275088696311157297823662689037894645226208583;
+    }
+
+    function _encodeWithdrawal(
+        uint256 _amount,
+        uint64 _proxyFee,
+        uint64 _proverFee,
+        address _prover,
+        address receiver
+    )
+        internal
+        
+        returns (
+            bytes memory commitData,
+            bytes memory proveData,
+            bytes32 nullifier,
+            bytes memory transfer_delta_bytes,
+            bytes memory memo
+        )
+    {
+        nullifier = bytes32(_randFR());
+        transfer_delta_bytes = abi.encodePacked( //28
+            uint48(0), //index 6
+            uint112(0), //energy 14
+            int64(-int256((_amount))) //8
+        );
+
+
+        uint256 foo  = uint256(bytes32(transfer_delta_bytes)) & transfer_delta_mask;
+        emit log_uint(foo);
+        commitData = abi.encodePacked(
+            // ZkBobSequencer.commit.selector, //4
+            nullifier, //32 nullifier
+            new bytes(32), //32 out_commit
+            transfer_delta_bytes
+        ); //96
+        for (uint256 i = 0; i < 8; i++) {
+            commitData = abi.encodePacked(commitData, new bytes(32)); //tx proof(8)*32 = 256
+        }
+
+        proveData = commitData;
+
+        for (uint256 i = 0; i < 9; i++) {
+            proveData = abi.encodePacked(proveData, _randFR()); //tx proof(8)*8 + root(1)*8 + tree proof(8)*8 = 136
+        }
+
+        memo = abi.encodePacked( //100 byte
+            // fixed size 20+8+8+8+20 = 64
+            bytes20(_prover), //20
+            _proxyFee, //8
+            _proverFee, //8
+            int64(0), // native amount, 8 bytes
+            receiver, // receiver 20 bytes
+            // message = 20+8 = 28 bytes
+            bytes4(0x01000000), // 1 item
+            _randFR() //32 //out account mock
+        );
+
+        commitData = abi.encodePacked(
+            commitData,
+            uint16(2), //withdrawal,
+            uint16(memo.length),
+            memo
+        );
+
+        proveData = abi.encodePacked(
+            proveData,
+            uint16(2), //withdrawal,
+            memo.length,
+            memo
+        );
+    }
+
+    address _prover1 = makeAddr("prover1");
+    address _user1 = makeAddr("user1");
+
+    function testParseWithdrawalCommitData() external {
+        uint256 _amount = uint256(9_960_000_000);
+        uint64 _proxyFee = uint64(10_000_000);
+        uint64 _proverFee = uint64(30_000_000);
+        (
+            bytes memory commit_data,
+            bytes memory prove_data,
+            bytes32 nullifier,
+            bytes memory transfer_delta_bytes,
+            bytes memory memo
+        ) = _encodeWithdrawal(_amount, _proxyFee, _proverFee, _prover1, _user1);
+
+        (bool success, bytes memory result) = address(_parser).call(
+            abi.encodePacked(
+                DummyParser.parseCommitCalldata.selector,
+                commit_data
+            )
+        );
+        assert(success);
+        emit log_bytes(result);
+        (
+            
+            ,//uint256 parsed_nullifier,
+            ,// uint256 parsed_outCommit,
+            ,// uint48 parsed_transferIndex,
+            ,// uint256 parsed_transferDelta,
+            ,// int64 parsed_tokenAmount,
+            ,// uint256[8] memory transferProof,
+            ,// uint16 parsed_txType,
+            bytes memory parsed_memo
+        ) = abi.decode(
+                result,
+                (
+                    uint256,
+                    uint256,
+                    uint48,
+                    uint256,
+                    int64,
+                    uint256[8],
+                    uint16,
+                    bytes
+                )
+            );
+
+        // assertEq(memo, parsed_memo);
+    }
+}
diff --git a/test/zkbob/ZkBobSequencer.t.sol b/test/zkbob/ZkBobSequencer.t.sol
index 45b0b2a..ea39ed8 100644
--- a/test/zkbob/ZkBobSequencer.t.sol
+++ b/test/zkbob/ZkBobSequencer.t.sol
@@ -448,15 +448,17 @@ abstract contract AbstractZkBobPoolSequencerTest is AbstractForkTest {
         address receiver) internal view  returns (bytes memory commitData, bytes memory proveData) {
 
             bytes32 nullifier = bytes32(_randFR());
-            commitData = abi.encodePacked(nullifier);
-            
+            // commitData = abi.encodePacked(nullifier);
+            bytes memory transfer_delta_bytes =  abi.encodePacked(//28
+                    uint48(0), //index 6
+                    uint112(0), //energy 14
+                    int64(-int256((_amount)))//8
+                    );
             commitData = abi.encodePacked(
             // ZkBobSequencer.commit.selector, //4
             nullifier, //32 nullifier
             new bytes(32), //32 out_commit
-            uint48(0), //index 6
-            uint112(0), //energy 14
-            int64(-int256((_amount)))//token amount 8
+            transfer_delta_bytes
         );//96
         for (uint256 i = 0; i < 8; i++) {
             commitData = abi.encodePacked(commitData, new bytes(32)); //tx proof(8)*32 = 256