diff --git a/src/blockchain_utilities/cn_deserialize.cpp b/src/blockchain_utilities/cn_deserialize.cpp
index b8d38c9af..a8448dcee 100644
--- a/src/blockchain_utilities/cn_deserialize.cpp
+++ b/src/blockchain_utilities/cn_deserialize.cpp
@@ -160,8 +160,9 @@ int main(int argc, char* argv[])
         std::cout << "field " << n << ": ";
         if (typeid(cryptonote::tx_extra_padding) == fields[n].type()) std::cout << "extra padding: " << boost::get<cryptonote::tx_extra_padding>(fields[n]).size << " bytes";
         else if (typeid(cryptonote::tx_extra_pub_key) == fields[n].type()) std::cout << "extra pub key: " << boost::get<cryptonote::tx_extra_pub_key>(fields[n]).pub_key;
-        else if (typeid(cryptonote::tx_extra_nonce) == fields[n].type()) std::cout << "extra nonce: " << boost::get<cryptonote::tx_extra_nonce>(fields[n]).nonce;
+        else if (typeid(cryptonote::tx_extra_nonce) == fields[n].type()) std::cout << "extra nonce: " << epee::string_tools::buff_to_hex_nodelimer(boost::get<cryptonote::tx_extra_nonce>(fields[n]).nonce);
         else if (typeid(cryptonote::tx_extra_merge_mining_tag) == fields[n].type()) std::cout << "extra merge mining tag: depth " << boost::get<cryptonote::tx_extra_merge_mining_tag>(fields[n]).depth << ", merkle root " << boost::get<cryptonote::tx_extra_merge_mining_tag>(fields[n]).merkle_root;
+        else if (typeid(cryptonote::tx_extra_mysterious_minergate) == fields[n].type()) std::cout << "extra minergate custom: " << epee::string_tools::buff_to_hex_nodelimer(boost::get<cryptonote::tx_extra_mysterious_minergate>(fields[n]).data);
         else std::cout << "unknown";
         std::cout << std::endl;
       }
diff --git a/src/cryptonote_core/tx_extra.h b/src/cryptonote_core/tx_extra.h
index 93d2e21b3..6f5fbe466 100644
--- a/src/cryptonote_core/tx_extra.h
+++ b/src/cryptonote_core/tx_extra.h
@@ -38,6 +38,7 @@
 #define TX_EXTRA_TAG_PUBKEY                 0x01
 #define TX_EXTRA_NONCE                      0x02
 #define TX_EXTRA_MERGE_MINING_TAG           0x03
+#define TX_EXTRA_MYSTERIOUS_MINERGATE_TAG   0xDE
 
 #define TX_EXTRA_NONCE_PAYMENT_ID           0x00
 #define TX_EXTRA_NONCE_ENCRYPTED_PAYMENT_ID 0x01
@@ -158,14 +159,24 @@ namespace cryptonote
     }
   };
 
+  struct tx_extra_mysterious_minergate
+  {
+    std::string data;
+
+    BEGIN_SERIALIZE()
+      FIELD(data)
+    END_SERIALIZE()
+  };
+
   // tx_extra_field format, except tx_extra_padding and tx_extra_pub_key:
   //   varint tag;
   //   varint size;
   //   varint data[];
-  typedef boost::variant<tx_extra_padding, tx_extra_pub_key, tx_extra_nonce, tx_extra_merge_mining_tag> tx_extra_field;
+  typedef boost::variant<tx_extra_padding, tx_extra_pub_key, tx_extra_nonce, tx_extra_merge_mining_tag, tx_extra_mysterious_minergate> tx_extra_field;
 }
 
 VARIANT_TAG(binary_archive, cryptonote::tx_extra_padding, TX_EXTRA_TAG_PADDING);
 VARIANT_TAG(binary_archive, cryptonote::tx_extra_pub_key, TX_EXTRA_TAG_PUBKEY);
 VARIANT_TAG(binary_archive, cryptonote::tx_extra_nonce, TX_EXTRA_NONCE);
 VARIANT_TAG(binary_archive, cryptonote::tx_extra_merge_mining_tag, TX_EXTRA_MERGE_MINING_TAG);
+VARIANT_TAG(binary_archive, cryptonote::tx_extra_mysterious_minergate, TX_EXTRA_MYSTERIOUS_MINERGATE_TAG);