diff --git a/beacon_chain/rpc/rest_debug_api.nim b/beacon_chain/rpc/rest_debug_api.nim
index 8e6bc537d..8592b7cfe 100644
--- a/beacon_chain/rpc/rest_debug_api.nim
+++ b/beacon_chain/rpc/rest_debug_api.nim
@@ -72,8 +72,11 @@ proc installDebugApiHandlers*(router: var RestRouter, node: BeaconNode) =
               "/eth/v2/debug/beacon/heads") do () -> RestApiResponse:
     RestApiResponse.jsonResponse(
       node.dag.heads.mapIt(
-        (root: it.root, slot: it.slot,
-         execution_optimistic: not it.executionValid)
+        RestChainHeadV2(
+          root: it.root,
+          slot: it.slot,
+          execution_optimistic: not it.executionValid
+        )
       )
     )
 
diff --git a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
index 371a64526..e5a4d3f51 100644
--- a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
+++ b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
@@ -122,6 +122,7 @@ RestJson.useDefaultSerializationFor(
   RestBeaconStatesFinalityCheckpoints,
   RestBlockHeader,
   RestBlockHeaderInfo,
+  RestChainHeadV2,
   RestCommitteeSubscription,
   RestContributionAndProof,
   RestDepositContract,
diff --git a/beacon_chain/spec/eth2_apis/rest_debug_calls.nim b/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
index ccb69a5fd..8b56ae9ea 100644
--- a/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
+++ b/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
@@ -13,6 +13,12 @@ import
 
 export chronos, client, rest_types, eth2_rest_serialization
 
+proc getDebugChainHeadsV2*(): RestResponse[GetDebugChainHeadsV2Response] {.
+     rest, endpoint: "/eth/v2/debug/beacon/heads",
+     meth: MethodGet.}
+  ## https://ethereum.github.io/beacon-APIs/#/Beacon/getDebugChainHeadsV2
+
+
 proc getStateV2Plain*(state_id: StateIdent): RestPlainResponse {.
      rest, endpoint: "/eth/v2/debug/beacon/states/{state_id}",
      accept: preferSSZ,
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index 902437414..06bfdbdb2 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -263,9 +263,10 @@ type
     connected*: uint64
     disconnecting*: uint64
 
-  RestChainHead* = object
+  RestChainHeadV2* = object
     root*: Eth2Digest
     slot*: Slot
+    execution_optimistic*: bool
 
   RestMetadata* = object
     seq_number*: string
@@ -541,7 +542,7 @@ type
   GetBlockHeaderResponse* = DataOptimisticAndFinalizedObject[RestBlockHeaderInfo]
   GetBlockHeadersResponse* = DataEnclosedObject[seq[RestBlockHeaderInfo]]
   GetBlockRootResponse* = DataOptimisticObject[RestRoot]
-  GetDebugChainHeadsResponse* = DataEnclosedObject[seq[RestChainHead]]
+  GetDebugChainHeadsV2Response* = DataEnclosedObject[seq[RestChainHeadV2]]
   GetDepositContractResponse* = DataEnclosedObject[RestDepositContract]
   GetDepositSnapshotResponse* = DataEnclosedObject[RestDepositSnapshot]
   GetEpochCommitteesResponse* = DataEnclosedObject[seq[RestBeaconStatesCommittees]]
diff --git a/beacon_chain/spec/keystore.nim b/beacon_chain/spec/keystore.nim
index a24f71b57..73fdf7d15 100644
--- a/beacon_chain/spec/keystore.nim
+++ b/beacon_chain/spec/keystore.nim
@@ -449,7 +449,7 @@ proc validateMnemonic*(inputWords: string,
 
   # TODO consider using a SecretString type for inputWords
 
-  let words = strutils.strip(inputWords.string.toNFKD).split(Whitespace)
+  let words = strutils.strip(inputWords.toNFKD).split(Whitespace)
   if words.len < 12 or words.len > 24 or words.len mod 3 != 0:
     return false