4 files changed, 23 insertions, 0 deletions
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 61ddff3d0..14a990131 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2038,6 +2038,7 @@ bool Blockchain::find_blockchain_supplement(const std::list<crypto::hash>& qbloc
   {
     resp.m_block_ids.push_back(m_db->get_block_hash_from_height(i));
   }
+  resp.cumulative_difficulty = m_db->get_block_cumulative_difficulty(m_db->height() - 1);
   m_db->block_txn_stop();
   return true;
 }
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index 7137f50a7..7fa78584b 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -831,6 +831,16 @@ namespace cryptonote
      *
      * @return a reference to the BlockchainDB instance
      */
+    const BlockchainDB& get_db() const
+    {
+      return *m_db;
+    }
+
+    /**
+     * @brief get a reference to the BlockchainDB in use by Blockchain
+     *
+     * @return a reference to the BlockchainDB instance
+     */
     BlockchainDB& get_db()
     {
       return *m_db;
diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 046b0eca0..19f4aaca9 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -1118,6 +1118,11 @@ namespace cryptonote
     return m_blockchain_storage.get_tail_id();
   }
   //-----------------------------------------------------------------------------------------------
+  difficulty_type core::get_block_cumulative_difficulty(uint64_t height) const
+  {
+    return m_blockchain_storage.get_db().get_block_cumulative_difficulty(height);
+  }
+  //-----------------------------------------------------------------------------------------------
   size_t core::get_pool_transactions_count() const
   {
     return m_mempool.get_transactions_count();
diff --git a/src/cryptonote_core/cryptonote_core.h b/src/cryptonote_core/cryptonote_core.h
index 982d67169..f17a6dfe6 100644
--- a/src/cryptonote_core/cryptonote_core.h
+++ b/src/cryptonote_core/cryptonote_core.h
@@ -521,6 +521,13 @@ namespace cryptonote
      crypto::hash get_tail_id() const;
 
      /**
+      * @copydoc Blockchain::get_block_cumulative_difficulty
+      *
+      * @note see Blockchain::get_block_cumulative_difficulty
+      */
+     difficulty_type get_block_cumulative_difficulty(uint64_t height) const;
+
+     /**
       * @copydoc Blockchain::get_random_outs_for_amounts
       *
       * @note see Blockchain::get_random_outs_for_amounts