diff --git a/beacon_chain/rpc/rest_validator_api.nim b/beacon_chain/rpc/rest_validator_api.nim
index cd864e5e9..593738e77 100644
--- a/beacon_chain/rpc/rest_validator_api.nim
+++ b/beacon_chain/rpc/rest_validator_api.nim
@@ -423,7 +423,7 @@ proc installValidatorApiHandlers*(router: var RestRouter, node: BeaconNode) =
           raiseAssert "preferredContentType() returns invalid content type"
 
   # https://ethereum.github.io/beacon-APIs/#/Validator/produceBlindedBlock
-  # https://github.com/ethereum/beacon-APIs/blob/v2.4.0/apis/validator/blinded_block.yaml
+  # https://github.com/ethereum/beacon-APIs/blob/c097f1a62c9a12c30e8175a39f205f92d3b931a9/apis/validator/blinded_block.yaml
   router.api(MethodGet, "/eth/v1/validator/blinded_blocks/{slot}") do (
       slot: Slot, randao_reveal: Option[ValidatorSig],
       graffiti: Option[GraffitiBytes],
diff --git a/beacon_chain/validators/beacon_validators.nim b/beacon_chain/validators/beacon_validators.nim
index 3ae68c6cf..8f048185e 100644
--- a/beacon_chain/validators/beacon_validators.nim
+++ b/beacon_chain/validators/beacon_validators.nim
@@ -661,9 +661,12 @@ proc constructSignableBlindedBlock[T: deneb_mev.SignedBlindedBeaconBlock](
 
   blindedBlock
 
-func constructPlainBlindedBlock[
-    T: capella_mev.BlindedBeaconBlock, EPH: capella.ExecutionPayloadHeader](
-    blck: ForkyBeaconBlock, executionPayloadHeader: EPH): T =
+func constructPlainBlindedBlock[T: capella_mev.BlindedBeaconBlock](
+    blck: ForkyBeaconBlock,
+    executionPayloadHeader: capella.ExecutionPayloadHeader): T =
+  # https://github.com/nim-lang/Nim/issues/23020 workaround
+  static: doAssert T is capella_mev.BlindedBeaconBlock
+
   const
     blckFields = getFieldNames(typeof(blck))
     blckBodyFields = getFieldNames(typeof(blck.body))
@@ -677,6 +680,25 @@ func constructPlainBlindedBlock[
 
   blindedBlock
 
+func constructPlainBlindedBlock[T: deneb_mev.BlindedBeaconBlock](
+    blck: ForkyBeaconBlock,
+    executionPayloadHeader: deneb_mev.BlindedExecutionPayloadAndBlobsBundle): T =
+  # https://github.com/nim-lang/Nim/issues/23020 workaround
+  static: doAssert T is deneb_mev.BlindedBeaconBlock
+
+  const
+    blckFields = getFieldNames(typeof(blck))
+    blckBodyFields = getFieldNames(typeof(blck.body))
+
+  var blindedBlock: T
+
+  # https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/validator.md#block-proposal
+  copyFields(blindedBlock, blck, blckFields)
+  copyFields(blindedBlock.body, blck.body, blckBodyFields)
+  assign(blindedBlock.body.execution_payload_header, executionPayloadHeader.execution_payload_header)
+
+  blindedBlock
+
 proc blindedBlockCheckSlashingAndSign[
     T:
       capella_mev.SignedBlindedBeaconBlock |
@@ -938,10 +960,10 @@ proc makeBlindedBeaconBlockForHeadAndSlot*[BBB: ForkyBlindedBeaconBlock](
   withBlck(forkedBlck):
     when consensusFork >= ConsensusFork.Capella:
       when ((consensusFork == ConsensusFork.Deneb and
-             EPH is deneb.ExecutionPayloadHeader) or
+             EPH is deneb_mev.BlindedExecutionPayloadAndBlobsBundle) or
             (consensusFork == ConsensusFork.Capella and
              EPH is capella.ExecutionPayloadHeader)):
-        return ok (constructPlainBlindedBlock[BBB, EPH](
+        return ok (constructPlainBlindedBlock[BBB](
           forkyBlck, executionPayloadHeader), bidValue)
       else:
         return err("makeBlindedBeaconBlockForHeadAndSlot: mismatched block/payload types")