diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/ZkTracer.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/ZkTracer.java
index 1734b8258d..1739244e0a 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/ZkTracer.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/ZkTracer.java
@@ -46,7 +46,6 @@
 import org.hyperledger.besu.evm.worldstate.WorldView;
 import org.hyperledger.besu.plugin.data.BlockBody;
 import org.hyperledger.besu.plugin.data.BlockHeader;
-import org.hyperledger.besu.plugin.data.ProcessableBlockHeader;
 
 @Slf4j
 public class ZkTracer implements LineCountingTracer {
@@ -164,19 +163,6 @@ public void traceEndConflation(final WorldView state) {
     }
   }
 
-  @Override
-  public void traceStartBlock(
-      WorldView world,
-      final ProcessableBlockHeader processableBlockHeader,
-      final Address miningBeneficiary) {
-    try {
-      this.hub.traceStartBlock(world, processableBlockHeader, miningBeneficiary);
-      this.debugMode.ifPresent(DebugMode::traceEndConflation);
-    } catch (final Exception e) {
-      this.tracingExceptions.add(e);
-    }
-  }
-
   @Override
   public void traceStartBlock(
       WorldView world,
diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/wcp/Wcp.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/wcp/Wcp.java
index 000b7ca097..caab09b8cf 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/wcp/Wcp.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/wcp/Wcp.java
@@ -37,10 +37,8 @@
 import net.consensys.linea.zktracer.opcode.OpCode;
 import org.apache.tuweni.bytes.Bytes;
 import org.apache.tuweni.bytes.Bytes32;
-import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.evm.frame.MessageFrame;
 import org.hyperledger.besu.evm.worldstate.WorldView;
-import org.hyperledger.besu.plugin.data.ProcessableBlockHeader;
 
 @RequiredArgsConstructor
 public class Wcp implements Module {
@@ -101,14 +99,6 @@ public void popTransactionBundle() {
     additionalRows.popTransactionBundle();
   }
 
-  @Override
-  public void traceStartBlock(
-      WorldView world,
-      final ProcessableBlockHeader processableBlockHeader,
-      final Address miningBeneficiary) {
-    additionalRows.commitTransactionBundle();
-  }
-
   @Override
   public void tracePreOpcode(MessageFrame frame, OpCode opcode) {
     if (opcode == LT
diff --git a/arithmetization/src/test/java/net/consensys/linea/LineCountingTracerTest.java b/arithmetization/src/test/java/net/consensys/linea/LineCountingTracerTest.java
index 164153b66e..f0e0883926 100644
--- a/arithmetization/src/test/java/net/consensys/linea/LineCountingTracerTest.java
+++ b/arithmetization/src/test/java/net/consensys/linea/LineCountingTracerTest.java
@@ -32,6 +32,7 @@
 import net.consensys.linea.zktracer.Fork;
 import net.consensys.linea.zktracer.ZkCounter;
 import net.consensys.linea.zktracer.ZkTracer;
+import org.hyperledger.besu.ethereum.core.BlockBody;
 import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.evm.worldstate.WorldView;
 import org.junit.jupiter.api.Test;
@@ -113,10 +114,11 @@ void startBlockStuffAreNotPopped() {
             .baseFee(DEFAULT_BASE_FEE)
             .parentBeaconBlockRoot(DEFAULT_BEACON_ROOT)
             .buildBlockHeader();
+    final BlockBody blockBody = BlockBody.empty();
 
     final ZkTracer tracer = new ZkTracer(chainConfig);
     tracer.traceStartConflation(1);
-    tracer.traceStartBlock(world, blockHeader, DEFAULT_COINBASE_ADDRESS);
+    tracer.traceStartBlock(world, blockHeader, blockBody, DEFAULT_COINBASE_ADDRESS);
     final Map<String, Integer> sizeBeforeTracer = tracer.getModulesLineCount();
     tracer.popTransactionBundle();
     final Map<String, Integer> sizeAfterTracer = tracer.getModulesLineCount();
@@ -128,7 +130,7 @@ void startBlockStuffAreNotPopped() {
 
     final ZkCounter counter = new ZkCounter(chainConfig.bridgeConfiguration);
     counter.traceStartConflation(1);
-    counter.traceStartBlock(world, blockHeader, DEFAULT_COINBASE_ADDRESS);
+    counter.traceStartBlock(world, blockHeader, blockBody, DEFAULT_COINBASE_ADDRESS);
     final Map<String, Integer> sizeBeforeCounter = counter.getModulesLineCount();
     counter.popTransactionBundle();
     final Map<String, Integer> sizeAfterCounter = counter.getModulesLineCount();
diff --git a/reference-tests/src/test/java/net/consensys/linea/BlockchainReferenceTestTools.java b/reference-tests/src/test/java/net/consensys/linea/BlockchainReferenceTestTools.java
index 54763c82c2..10c57df42f 100644
--- a/reference-tests/src/test/java/net/consensys/linea/BlockchainReferenceTestTools.java
+++ b/reference-tests/src/test/java/net/consensys/linea/BlockchainReferenceTestTools.java
@@ -611,7 +611,8 @@ public static void executeTest(final BlockchainReferenceTestCaseSpec spec) {
       try {
         final Block block = candidateBlock.getBlock();
 
-        zkTracer.traceStartBlock(worldState, block.getHeader(), block.getHeader().getCoinbase());
+        zkTracer.traceStartBlock(
+            worldState, block.getHeader(), block.getBody(), block.getHeader().getCoinbase());
 
         final ProtocolSpec protocolSpec = schedule.getByBlockHeader(block.getHeader());