2 files changed, 8 insertions, 1 deletions
diff --git a/src/cryptonote_protocol/cryptonote_protocol_defs.h b/src/cryptonote_protocol/cryptonote_protocol_defs.h
index d582e3e9c..3083a5b4c 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_defs.h
+++ b/src/cryptonote_protocol/cryptonote_protocol_defs.h
@@ -34,6 +34,7 @@
 #include "serialization/keyvalue_serialization.h"
 #include "cryptonote_basic/cryptonote_basic.h"
 #include "cryptonote_basic/blobdatatype.h"
+
 namespace cryptonote
 {
 
@@ -208,6 +209,7 @@ namespace cryptonote
   {
     uint64_t current_height;
     uint64_t cumulative_difficulty;
+    uint64_t cumulative_difficulty_top64;
     crypto::hash  top_id;
     uint8_t top_version;
     uint32_t pruning_seed;
@@ -215,6 +217,7 @@ namespace cryptonote
     BEGIN_KV_SERIALIZE_MAP()
       KV_SERIALIZE(current_height)
       KV_SERIALIZE(cumulative_difficulty)
+      KV_SERIALIZE(cumulative_difficulty_top64)
       KV_SERIALIZE_VAL_POD_AS_BLOB(top_id)
       KV_SERIALIZE_OPT(top_version, (uint8_t)0)
       KV_SERIALIZE_OPT(pruning_seed, (uint32_t)0)
@@ -245,12 +248,14 @@ namespace cryptonote
       uint64_t start_height;
       uint64_t total_height;
       uint64_t cumulative_difficulty;
+      uint64_t cumulative_difficulty_top64;
       std::vector<crypto::hash> m_block_ids;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(start_height)
         KV_SERIALIZE(total_height)
         KV_SERIALIZE(cumulative_difficulty)
+        KV_SERIALIZE(cumulative_difficulty_top64)
         KV_SERIALIZE_CONTAINER_POD_AS_BLOB(m_block_ids)
       END_KV_SERIALIZE_MAP()
     };
diff --git a/src/cryptonote_protocol/cryptonote_protocol_handler.inl b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
index b33867e8b..32f0afceb 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_handler.inl
+++ b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
@@ -398,7 +398,9 @@ namespace cryptonote
   {
     m_core.get_blockchain_top(hshd.current_height, hshd.top_id);
     hshd.top_version = m_core.get_ideal_hard_fork_version(hshd.current_height);
-    hshd.cumulative_difficulty = m_core.get_block_cumulative_difficulty(hshd.current_height);
+    difficulty_type wide_cumulative_difficulty = m_core.get_block_cumulative_difficulty(hshd.current_height);
+    hshd.cumulative_difficulty = (wide_cumulative_difficulty << 64 >> 64).convert_to<uint64_t>();
+    hshd.cumulative_difficulty_top64 = (wide_cumulative_difficulty >> 64).convert_to<uint64_t>();
     hshd.current_height +=1;
     hshd.pruning_seed = m_core.get_blockchain_pruning_seed();
     return true;