diff --git a/beacon_chain/nimbus_beacon_node.nim b/beacon_chain/nimbus_beacon_node.nim
index 4f964b35ac..e3522eec1b 100644
--- a/beacon_chain/nimbus_beacon_node.nim
+++ b/beacon_chain/nimbus_beacon_node.nim
@@ -23,8 +23,7 @@ import
   ./validators/[keystore_management, beacon_validators],
   "."/[
     beacon_node, beacon_node_light_client, deposits,
-    nimbus_binary_common, statusbar, trusted_node_sync, wallets,
-    winservice]
+    nimbus_binary_common, statusbar, trusted_node_sync, wallets]
 
 when defined(posix):
   import system/ansi_c
@@ -1508,6 +1507,9 @@ func syncStatus(node: BeaconNode, wallSlot: Slot): string =
   else:
     "synced"
 
+when defined(windows):
+  from winservice import establishWindowsService, reportServiceStatusSuccess
+
 proc onSlotStart(node: BeaconNode, wallTime: BeaconTime,
                  lastSlot: Slot): Future[bool] {.async.} =
   ## Called at the beginning of a slot - usually every slot, but sometimes might
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index a10168706e..916f0580f0 100644
--- a/beacon_chain/spec/state_transition_block.nim
+++ b/beacon_chain/spec/state_transition_block.nim
@@ -7,10 +7,10 @@
 
 # State transition - block processing, as described in
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/beacon-chain.md#block-processing
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/bellatrix/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#block-processing
-# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/deneb/beacon-chain.md#block-processing
 #
 # The entry point is `process_block` which is at the bottom of this file.
 #
@@ -726,22 +726,14 @@ func kzg_commitment_to_versioned_hash*(
   res[1 .. 31] = eth2digest(kzg_commitment).data.toOpenArray(1, 31)
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/fork-choice.md#validate_blobs
-proc validate_blobs*(expected_kzg_commitments: seq[KzgCommitment],
-                     blobs: seq[KzgBlob],
-                     proofs: seq[KzgProof]):
-                       Result[void, cstring] =
-  if expected_kzg_commitments.len != blobs.len:
-    return err("validate_blobs: different commitment and blob lengths")
-
-  if proofs.len != blobs.len:
-    return err("validate_blobs: different proof and blob lengths")
-
+proc validate_blobs*(
+    expected_kzg_commitments: seq[KzgCommitment], blobs: seq[KzgBlob],
+    proofs: seq[KzgProof]): Result[void, string] =
   let res = verifyProofs(blobs, expected_kzg_commitments, proofs).valueOr:
-    return err("validate_blobs: proof verification error")
+    return err("validate_blobs proof verification error: " & error())
 
   if not res:
-    return err("validate_blobs: proof verification failed")
+    return err("validate_blobs proof verification failed")
 
   ok()
 
diff --git a/beacon_chain/validators/message_router.nim b/beacon_chain/validators/message_router.nim
index dd0aef5572..0bff89d915 100644
--- a/beacon_chain/validators/message_router.nim
+++ b/beacon_chain/validators/message_router.nim
@@ -82,7 +82,7 @@ template blockProcessor(router: MessageRouter): ref BlockProcessor =
 template getCurrentBeaconTime(router: MessageRouter): BeaconTime =
   router.processor[].getCurrentBeaconTime()
 
-type RouteBlockResult = Result[Opt[BlockRef], cstring]
+type RouteBlockResult = Result[Opt[BlockRef], string]
 proc routeSignedBeaconBlock*(
     router: ref MessageRouter, blck: ForkySignedBeaconBlock,
     blobsOpt: Opt[seq[BlobSidecar]]): Future[RouteBlockResult] {.async.} =
@@ -101,7 +101,7 @@ proc routeSignedBeaconBlock*(
       warn "Block failed validation",
         blockRoot = shortLog(blck.root), blck = shortLog(blck.message),
         signature = shortLog(blck.signature), error = res.error()
-      return err(res.error()[1])
+      return err($(res.error()[1]))
 
     when typeof(blck).kind >= ConsensusFork.Deneb:
       if blobsOpt.isSome: