fix(protocol): hash deposit IDs

packages/protocol/contracts/L1/TaikoData.sol

@@ -108,10 +108,11 @@ library TaikoData {
         uint24 size;
     }
 
-    // 1 slot
+    // 2 slot
     struct EthDeposit {
         address recipient;
         uint96 amount;
+        uint64 id;
     }
 
     struct State {

packages/protocol/contracts/L1/libs/LibEthDepositing.sol

@@ -38,7 +38,8 @@ library LibEthDepositing {
 
         TaikoData.EthDeposit memory deposit = TaikoData.EthDeposit({
             recipient: msg.sender,
-            amount: uint96(msg.value)
+            amount: uint96(msg.value),
+            id: uint64(state.ethDeposits.length)
         });
 
         address to = resolver.resolve("ether_vault", true);
@@ -126,19 +127,6 @@ library LibEthDepositing {
         pure
         returns (bytes32)
     {
-        bytes memory buffer = new bytes(32 * deposits.length);
-
-        for (uint256 i; i < deposits.length;) {
-            uint256 encoded = uint256(uint160(deposits[i].recipient)) << 96
-                | uint256(deposits[i].amount);
-            assembly {
-                mstore(add(buffer, mul(32, add(1, i))), encoded)
-            }
-            unchecked {
-                ++i;
-            }
-        }
-
-        return keccak256(buffer);
+        return keccak256(abi.encode(deposits));
     }
 }

packages/protocol/test/TaikoL1.t.sol

@@ -334,12 +334,12 @@ contract TaikoL1Test is TaikoL1TestBase {
             proposeBlock(Alice, 1_000_000, 1024);
 
         // Expected:
-        // 0x8117066d69ff650d78f0d7383a10cc802c2b8c0eedd932d70994252e2438c636  (pre
+        // 0x9098dca53e2412a11d456add7b3652df403e043b2a20f456d4651b9a73b70a30  (pre
         // calculated with these values)
         //console2.logBytes32(meta.depositsRoot);
         assertEq(
             LibEthDepositing.hashEthDeposits(meta.depositsProcessed),
-            0x8117066d69ff650d78f0d7383a10cc802c2b8c0eedd932d70994252e2438c636
+            0x9098dca53e2412a11d456add7b3652df403e043b2a20f456d4651b9a73b70a30
         );
     }
 }