diff --git a/beacon_chain/spec/datatypes/deneb.nim b/beacon_chain/spec/datatypes/deneb.nim
index d679bfb58..7f528f1af 100644
--- a/beacon_chain/spec/datatypes/deneb.nim
+++ b/beacon_chain/spec/datatypes/deneb.nim
@@ -134,6 +134,12 @@ type
     blob_gas_used*: uint64   # [New in Deneb:EIP4844]
     excess_blob_gas*: uint64 # [New in Deneb:EIP4844]
 
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.2/specs/deneb/validator.md#blobsbundle
+  BlobsBundle* = object
+    commitments*: seq[KZGCommitment]
+    proofs*: seq[KZGProof]
+    blobs*: seq[Blob]
+
   ExecutePayload* = proc(
     execution_payload: ExecutionPayload): bool {.gcsafe, raises: [].}
 
diff --git a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
index 08b24ff75..9c0ffe6df 100644
--- a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
+++ b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
@@ -97,6 +97,7 @@ type
     SetGasLimitRequest |
     bellatrix_mev.SignedBlindedBeaconBlock |
     capella_mev.SignedBlindedBeaconBlock |
+    deneb_mev.SignedBlindedBeaconBlockContents |
     SignedValidatorRegistrationV1 |
     SignedVoluntaryExit |
     Web3SignerRequest |
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index 9b0773cd8..db9dea68a 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -21,6 +21,7 @@ import
   ".."/mev/[capella_mev, deneb_mev]
 
 from ".."/datatypes/capella import BeaconBlockBody
+from ".."/mev/deneb_mev import ExecutionPayloadAndBlobsBundle
 
 export forks, phase0, altair, bellatrix, capella, capella_mev, deneb_mev,
        tables, httputils
@@ -545,7 +546,7 @@ type
   ProduceBlindedBlockResponse* = ForkedBlindedBeaconBlock
   ProduceSyncCommitteeContributionResponse* = DataEnclosedObject[SyncCommitteeContribution]
   SubmitBlindedBlockResponseCapella* = DataEnclosedObject[capella.ExecutionPayload]
-  SubmitBlindedBlockResponseDeneb* = DataEnclosedObject[deneb.ExecutionPayload]
+  SubmitBlindedBlockResponseDeneb* = DataEnclosedObject[deneb_mev.ExecutionPayloadAndBlobsBundle]
   GetValidatorsActivityResponse* = DataEnclosedObject[seq[RestActivityItem]]
   GetValidatorsLivenessResponse* = DataEnclosedObject[seq[RestLivenessItem]]
 
diff --git a/beacon_chain/spec/mev/deneb_mev.nim b/beacon_chain/spec/mev/deneb_mev.nim
index 22e6d2f3b..9c8633338 100644
--- a/beacon_chain/spec/mev/deneb_mev.nim
+++ b/beacon_chain/spec/mev/deneb_mev.nim
@@ -5,21 +5,28 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
+{.push raises: [].}
+
 import ".."/datatypes/[altair, capella, deneb]
 from stew/byteutils import to0xHex
 
-{.push raises: [].}
-
 type
-  # https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/builder.md#builderbid
-  # https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/capella/builder.md#executionpayloadheader
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#blindedblobsbundle
+  BlindedBlobsBundle* = object
+    commitments*: List[KZGCommitment, Limit MAX_BLOB_COMMITMENTS_PER_BLOCK]
+    proofs*: List[KZGProof, Limit MAX_BLOB_COMMITMENTS_PER_BLOCK]
+    blob_roots*: List[Eth2Digest, Limit MAX_BLOB_COMMITMENTS_PER_BLOCK]
+
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#builderbid
   BuilderBid* = object
-    header*: deneb.ExecutionPayloadHeader
+    header*: deneb.ExecutionPayloadHeader # [Modified in Deneb]
+    blinded_blobs_bundle*: BlindedBlobsBundle # [New in Deneb]
     value*: UInt256
     pubkey*: ValidatorPubKey
 
   # https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/builder.md#signedbuilderbid
   # https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/capella/builder.md#executionpayloadheader
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#executionpayloadheader
   SignedBuilderBid* = object
     message*: BuilderBid
     signature*: ValidatorSig
@@ -59,6 +66,33 @@ type
     message*: BlindedBeaconBlock
     signature*: ValidatorSig
 
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#blindedblobsidecar
+  BlindedBlobSidecar* = object
+    block_root*: Eth2Digest
+    index*: uint64
+    slot*: uint64
+    block_parent_root*: Eth2Digest
+    proposer_index*: uint64
+    blob_root*: Eth2Digest
+    kzg_commitment*: KZGCommitment
+    kzg_proof*: KZGProof
+
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#signedblindedblobsidecar
+  SignedBlindedBlobSidecar* = object
+    message*: BlindedBlobSidecar
+    signature*: ValidatorSig
+
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#signedblindedblockcontents
+  SignedBlindedBeaconBlockContents* = object
+    signed_blinded_block*: SignedBlindedBeaconBlock
+    signed_blinded_blob_sidecars*:
+      List[SignedBlindedBlobSidecar, Limit MAX_BLOBS_PER_BLOCK]
+
+  # https://github.com/ethereum/builder-specs/blob/534e4f81276b8346d785ed9aba12c4c74b927ec6/specs/deneb/builder.md#executionpayloadandblobsbundle
+  ExecutionPayloadAndBlobsBundle* = object
+    execution_payload*: deneb.ExecutionPayload
+    blobs_bundle*: BlobsBundle
+
 func shortLog*(v: BlindedBeaconBlock): auto =
   (
     slot: shortLog(v.slot),
diff --git a/beacon_chain/spec/mev/rest_deneb_mev_calls.nim b/beacon_chain/spec/mev/rest_deneb_mev_calls.nim
index 0414f8616..b1a20500c 100644
--- a/beacon_chain/spec/mev/rest_deneb_mev_calls.nim
+++ b/beacon_chain/spec/mev/rest_deneb_mev_calls.nim
@@ -18,10 +18,10 @@ proc getHeaderDeneb*(slot: Slot,
                     ): RestResponse[GetHeaderResponseDeneb] {.
      rest, endpoint: "/eth/v1/builder/header/{slot}/{parent_hash}/{pubkey}",
      meth: MethodGet, connection: {Dedicated, Close}.}
-  ## https://github.com/ethereum/builder-specs/blob/v0.3.0/apis/builder/header.yaml
+  ## https://github.com/ethereum/builder-specs/blob/34509da74237942aa15a4c0ca828f67acdf77652/apis/builder/header.yaml
 
-proc submitBlindedBlock*(body: deneb_mev.SignedBlindedBeaconBlock
+proc submitBlindedBlock*(body: deneb_mev.SignedBlindedBeaconBlockContents
                         ): RestResponse[SubmitBlindedBlockResponseDeneb] {.
      rest, endpoint: "/eth/v1/builder/blinded_blocks",
      meth: MethodPost, connection: {Dedicated, Close}.}
-  ## https://github.com/ethereum/builder-specs/blob/v0.3.0/apis/builder/blinded_blocks.yaml
+  ## https://github.com/ethereum/builder-specs/blob/34509da74237942aa15a4c0ca828f67acdf77652/apis/builder/blinded_blocks.yaml