diff --git a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/IbftJsonRpcMethodsFactory.java b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/IbftJsonRpcMethodsFactory.java
index dd4a91a9b5..416290b11d 100644
--- a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/IbftJsonRpcMethodsFactory.java
+++ b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/IbftJsonRpcMethodsFactory.java
@@ -12,9 +12,11 @@
  */
 package tech.pegasys.pantheon.consensus.ibft.jsonrpc;
 
+import tech.pegasys.pantheon.consensus.common.BlockInterface;
 import tech.pegasys.pantheon.consensus.ibft.IbftBlockInterface;
 import tech.pegasys.pantheon.consensus.ibft.IbftContext;
 import tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods.IbftDiscardValidatorVote;
+import tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods.IbftGetValidatorsByBlockHash;
 import tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods.IbftGetValidatorsByBlockNumber;
 import tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods.IbftProposeValidatorVote;
 import tech.pegasys.pantheon.ethereum.ProtocolContext;
@@ -37,16 +39,18 @@ public Map<String, JsonRpcMethod> methods(
     final Map<String, JsonRpcMethod> rpcMethods = new HashMap<>();
 
     if (jsonRpcApis.contains(IbftRpcApis.IBFT)) {
-      BlockchainQueries blockchainQueries =
+      final BlockchainQueries blockchainQueries =
           new BlockchainQueries(context.getBlockchain(), context.getWorldStateArchive());
+      final BlockInterface blockInterface = new IbftBlockInterface();
       addMethods(
           rpcMethods,
           new IbftProposeValidatorVote(
               context.getConsensusState().getVoteProposer(), jsonRpcParameter),
-          new IbftGetValidatorsByBlockNumber(
-              blockchainQueries, new IbftBlockInterface(), jsonRpcParameter),
+          new IbftGetValidatorsByBlockNumber(blockchainQueries, blockInterface, jsonRpcParameter),
           new IbftDiscardValidatorVote(
-              context.getConsensusState().getVoteProposer(), jsonRpcParameter));
+              context.getConsensusState().getVoteProposer(), jsonRpcParameter),
+          new IbftGetValidatorsByBlockHash(
+              context.getBlockchain(), blockInterface, jsonRpcParameter));
     }
 
     return rpcMethods;
diff --git a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockHash.java b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockHash.java
index 81a8e3bf30..19f5edebb9 100644
--- a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockHash.java
+++ b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockHash.java
@@ -12,7 +12,7 @@
  */
 package tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods;
 
-import tech.pegasys.pantheon.consensus.ibft.IbftBlockInterface;
+import tech.pegasys.pantheon.consensus.common.BlockInterface;
 import tech.pegasys.pantheon.ethereum.chain.Blockchain;
 import tech.pegasys.pantheon.ethereum.core.BlockHeader;
 import tech.pegasys.pantheon.ethereum.core.Hash;
@@ -28,15 +28,15 @@
 public class IbftGetValidatorsByBlockHash implements JsonRpcMethod {
 
   private final Blockchain blockchain;
-  private final IbftBlockInterface ibftBlockInterface;
+  private final BlockInterface blockInterface;
   private final JsonRpcParameter parameters;
 
   public IbftGetValidatorsByBlockHash(
       final Blockchain blockchain,
-      final IbftBlockInterface ibftBlockInterface,
+      final BlockInterface blockInterface,
       final JsonRpcParameter parameters) {
     this.blockchain = blockchain;
-    this.ibftBlockInterface = ibftBlockInterface;
+    this.blockInterface = blockInterface;
     this.parameters = parameters;
   }
 
@@ -56,7 +56,7 @@ private Object blockResult(final JsonRpcRequest request) {
     return blockHeader
         .map(
             header ->
-                ibftBlockInterface
+                blockInterface
                     .validatorsInBlock(header)
                     .stream()
                     .map(validator -> validator.toString())
diff --git a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockNumber.java b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockNumber.java
index 2b60efeff1..8faf0332aa 100644
--- a/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockNumber.java
+++ b/consensus/ibft/src/main/java/tech/pegasys/pantheon/consensus/ibft/jsonrpc/methods/IbftGetValidatorsByBlockNumber.java
@@ -12,7 +12,7 @@
  */
 package tech.pegasys.pantheon.consensus.ibft.jsonrpc.methods;
 
-import tech.pegasys.pantheon.consensus.ibft.IbftBlockInterface;
+import tech.pegasys.pantheon.consensus.common.BlockInterface;
 import tech.pegasys.pantheon.ethereum.core.BlockHeader;
 import tech.pegasys.pantheon.ethereum.jsonrpc.internal.JsonRpcRequest;
 import tech.pegasys.pantheon.ethereum.jsonrpc.internal.methods.AbstractBlockParameterMethod;
@@ -27,14 +27,14 @@
 public class IbftGetValidatorsByBlockNumber extends AbstractBlockParameterMethod
     implements JsonRpcMethod {
 
-  private final IbftBlockInterface ibftBlockInterface;
+  private final BlockInterface blockInterface;
 
   public IbftGetValidatorsByBlockNumber(
       final BlockchainQueries blockchainQueries,
-      final IbftBlockInterface ibftBlockInterface,
+      final BlockInterface blockInterface,
       final JsonRpcParameter parameters) {
     super(blockchainQueries, parameters);
-    this.ibftBlockInterface = ibftBlockInterface;
+    this.blockInterface = blockInterface;
   }
 
   @Override
@@ -49,7 +49,7 @@ protected Object resultByBlockNumber(final JsonRpcRequest request, final long bl
     return blockHeader
         .map(
             header ->
-                ibftBlockInterface
+                blockInterface
                     .validatorsInBlock(header)
                     .stream()
                     .map(validator -> validator.toString())