diff --git a/src/cryptonote_core/cryptonote_basic.h b/src/cryptonote_core/cryptonote_basic.h
index d59e37b..a681a4c 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -479,11 +479,11 @@ namespace cryptonote
 
     BEGIN_SERIALIZE_OBJECT()
       FIELDS(*static_cast<block_header *>(this))
-      if (BLOCK_MAJOR_VERSION_2 <= major_version)
-      {
-        auto sbb = make_serializable_bytecoin_block(*this, false, false);
-        FIELD_N("parent_block", sbb);
-      }
+//      if (BLOCK_MAJOR_VERSION_2 <= major_version)
+//      {
+//        auto sbb = make_serializable_bytecoin_block(*this, false, false);
+//        FIELD_N("parent_block", sbb);
+//      }
       FIELD(miner_tx)
       FIELD(tx_hashes)
     END_SERIALIZE()
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 7d8562b..739b3b6 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -650,15 +650,15 @@ namespace cryptonote
     if (!get_block_hashing_blob(b, blob))
       return false;
 
-    if (BLOCK_MAJOR_VERSION_2 <= b.major_version)
-    {
-      blobdata parent_blob;
-      auto sbb = make_serializable_bytecoin_block(b, true, false);
-      if (!t_serializable_object_to_blob(sbb, parent_blob))
-        return false;
+//    if (BLOCK_MAJOR_VERSION_2 <= b.major_version)
+//    {
+//      blobdata parent_blob;
+//      auto sbb = make_serializable_bytecoin_block(b, true, false);
+//      if (!t_serializable_object_to_blob(sbb, parent_blob))
+//        return false;
 
-      blob.append(parent_blob);
-    }
+//      blob.append(parent_blob);
+//    }
 
     return get_object_hash(blob, res);
   }
@@ -851,8 +851,8 @@ namespace cryptonote
   //---------------------------------------------------------------
   bool check_proof_of_work_v1(const block& bl, difficulty_type current_diffic, crypto::hash& proof_of_work)
   {
-    if (BLOCK_MAJOR_VERSION_1 != bl.major_version)
-      return false;
+//    if (BLOCK_MAJOR_VERSION_1 != bl.major_version)
+//      return false;
 
     proof_of_work = get_block_longhash(bl, 0);
     return check_hash(proof_of_work, current_diffic);
@@ -899,7 +899,7 @@ namespace cryptonote
     switch (bl.major_version)
     {
     case BLOCK_MAJOR_VERSION_1: return check_proof_of_work_v1(bl, current_diffic, proof_of_work);
-    case BLOCK_MAJOR_VERSION_2: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
+    case BLOCK_MAJOR_VERSION_2: return check_proof_of_work_v1(bl, current_diffic, proof_of_work);
     }
 
     CHECK_AND_ASSERT_MES(false, false, "unknown block major version: " << bl.major_version << "." << bl.minor_version);