diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 9dccf4a..fac0caa 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -3,10 +3,11 @@
 #define CURRENT_TRANSACTION_VERSION 1
 
 enum BLOB_TYPE {
-  BLOB_TYPE_CRYPTONOTE  = 0,
-  BLOB_TYPE_FORKNOTE1   = 1,
-  BLOB_TYPE_FORKNOTE2   = 2,
-  BLOB_TYPE_CRYPTONOTE2 = 3, // Masari
-  BLOB_TYPE_CRYPTONOTE_RYO = 4, // Ryo
+  BLOB_TYPE_CRYPTONOTE      = 0,
+  BLOB_TYPE_FORKNOTE1       = 1,
+  BLOB_TYPE_FORKNOTE2       = 2,
+  BLOB_TYPE_CRYPTONOTE2     = 3, // Masari
+  BLOB_TYPE_CRYPTONOTE_RYO  = 4, // Ryo
   BLOB_TYPE_CRYPTONOTE_LOKI = 5, // Loki
+  BLOB_TYPE_CRYPTONOTE3     = 6, // Masari
 };
\ No newline at end of file
diff --git a/src/cryptonote_core/cryptonote_basic.h b/src/cryptonote_core/cryptonote_basic.h
index a7e2ac1..83e94c6 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -398,6 +398,7 @@ namespace cryptonote
 
     transaction miner_tx;
     std::vector<crypto::hash> tx_hashes;
+    mutable crypto::hash uncle = cryptonote::null_hash;
 
     void set_blob_type(enum BLOB_TYPE bt) { miner_tx.blob_type = blob_type = bt; }
 
@@ -410,6 +411,10 @@ namespace cryptonote
       }
       FIELD(miner_tx)
       FIELD(tx_hashes)
+      if (blob_type == BLOB_TYPE_CRYPTONOTE3)
+      {
+        FIELD(uncle)
+      }
     END_SERIALIZE()
   };
 
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index d66dc5d..bf51cfd 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -433,7 +433,9 @@ namespace cryptonote
     crypto::hash tree_root_hash = get_tx_tree_hash(b);
     blob.append(reinterpret_cast<const char*>(&tree_root_hash), sizeof(tree_root_hash));
     blob.append(tools::get_varint_data(b.tx_hashes.size()+1));
-
+    if (b.blob_type == BLOB_TYPE_CRYPTONOTE3) {
+      blob.append(reinterpret_cast<const char*>(&b.uncle), sizeof(b.uncle));
+    }
     return true;
   }
   //---------------------------------------------------------------