gloas beacon_block gossip rules

beacon/sync/src/testFixtures/java/tech/pegasys/teku/beacon/sync/SyncingNodeManager.java

@@ -68,9 +68,10 @@
 import tech.pegasys.teku.statetransition.util.FutureItems;
 import tech.pegasys.teku.statetransition.util.PendingPool;
 import tech.pegasys.teku.statetransition.util.PoolFactory;
-import tech.pegasys.teku.statetransition.validation.BlockGossipValidator;
 import tech.pegasys.teku.statetransition.validation.BlockValidator;
 import tech.pegasys.teku.statetransition.validation.GossipValidationHelper;
+import tech.pegasys.teku.statetransition.validation.block.BlockGossipValidator;
+import tech.pegasys.teku.statetransition.validation.block.EquivocationChecker;
 import tech.pegasys.teku.storage.api.FinalizedCheckpointChannel;
 import tech.pegasys.teku.storage.client.MemoryOnlyRecentChainData;
 import tech.pegasys.teku.storage.client.RecentChainData;
@@ -133,7 +134,8 @@ public static SyncingNodeManager create(
         new BlockGossipValidator(
             spec,
             new GossipValidationHelper(spec, recentChainData),
-            receivedBlockEventsChannelPublisher);
+            receivedBlockEventsChannelPublisher,
+            new EquivocationChecker());
     final BlockValidator blockValidator = new BlockValidator(blockGossipValidator);
 
     final TimeProvider timeProvider = new SystemTimeProvider();

ethereum/statetransition/src/main/java/tech/pegasys/teku/statetransition/validation/BlockBroadcastValidator.java

@@ -17,6 +17,7 @@
 import tech.pegasys.teku.spec.datastructures.blocks.SignedBeaconBlock;
 import tech.pegasys.teku.spec.datastructures.validator.BroadcastValidationLevel;
 import tech.pegasys.teku.spec.logic.common.statetransition.results.BlockImportResult;
+import tech.pegasys.teku.statetransition.validation.block.BlockGossipValidator;
 
 public interface BlockBroadcastValidator {
 

ethereum/statetransition/src/main/java/tech/pegasys/teku/statetransition/validation/BlockBroadcastValidatorImpl.java

@@ -26,7 +26,8 @@
 import tech.pegasys.teku.spec.datastructures.blocks.SignedBeaconBlock;
 import tech.pegasys.teku.spec.datastructures.validator.BroadcastValidationLevel;
 import tech.pegasys.teku.spec.logic.common.statetransition.results.BlockImportResult;
-import tech.pegasys.teku.statetransition.validation.BlockGossipValidator.EquivocationCheckResult;
+import tech.pegasys.teku.statetransition.validation.block.BlockGossipValidator;
+import tech.pegasys.teku.statetransition.validation.block.EquivocationChecker;
 
 class BlockBroadcastValidatorImpl implements BlockBroadcastValidator {
   private final BlockGossipValidator blockGossipValidator;
@@ -171,6 +172,6 @@ private void buildValidationPipeline(final SignedBeaconBlock block) {
   private boolean isEquivocatingBlock(final SignedBeaconBlock block, final boolean markAsReceived) {
     return blockGossipValidator
         .performBlockEquivocationCheck(markAsReceived, block)
-        .equals(EquivocationCheckResult.EQUIVOCATING_BLOCK_FOR_SLOT_PROPOSER);
+        .equals(EquivocationChecker.EquivocationCheckResult.EQUIVOCATING_BLOCK_FOR_SLOT_PROPOSER);
   }
 }

ethereum/statetransition/src/main/java/tech/pegasys/teku/statetransition/validation/BlockValidator.java

@@ -16,6 +16,7 @@
 import tech.pegasys.teku.infrastructure.async.SafeFuture;
 import tech.pegasys.teku.spec.datastructures.blocks.SignedBeaconBlock;
 import tech.pegasys.teku.spec.datastructures.validator.BroadcastValidationLevel;
+import tech.pegasys.teku.statetransition.validation.block.BlockGossipValidator;
 
 public class BlockValidator {
 

ethereum/statetransition/src/main/java/tech/pegasys/teku/statetransition/validation/StatefulValidationRule.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright Consensys Software Inc., 2025
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package tech.pegasys.teku.statetransition.validation;
+
+import java.util.Optional;
+import tech.pegasys.teku.spec.datastructures.blocks.SignedBeaconBlock;
+import tech.pegasys.teku.spec.datastructures.state.beaconstate.BeaconState;
+
+public interface StatefulValidationRule {
+
+  /**
+   * Performs a single validation check on a block.
+   *
+   * @param block The block being validated.
+   * @param parentState The state of the parent block.
+   * @return An Optional containing an InternalValidationResult if the rule fails. Returns
+   *     Optional.empty() if the rule passes.
+   */
+  Optional<InternalValidationResult> validate(SignedBeaconBlock block, BeaconState parentState);
+}