diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index e3450491b..b4942d03a 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -1750,6 +1750,34 @@ bool Blockchain::handle_alternative_block(const block& b, const crypto::hash& id
     }
     bei.cumulative_difficulty += current_diff;
 
+    bei.block_cumulative_weight = cryptonote::get_transaction_weight(b.miner_tx);
+    for (const crypto::hash &txid: b.tx_hashes)
+    {
+      cryptonote::tx_memory_pool::tx_details td;
+      cryptonote::blobdata blob;
+      if (m_tx_pool.get_transaction_info(txid, td))
+      {
+        bei.block_cumulative_weight += td.weight;
+      }
+      else if (m_db->get_pruned_tx_blob(txid, blob))
+      {
+        cryptonote::transaction tx;
+        if (!cryptonote::parse_and_validate_tx_base_from_blob(blob, tx))
+        {
+          MERROR_VER("Block with id: " << epee::string_tools::pod_to_hex(id) << " (as alternative) refers to unparsable transaction hash " << txid << ".");
+          bvc.m_verifivation_failed = true;
+          return false;
+        }
+        bei.block_cumulative_weight += cryptonote::get_pruned_transaction_weight(tx);
+      }
+      else
+      {
+        // we can't determine the block weight, set it to 0 and break out of the loop
+        bei.block_cumulative_weight = 0;
+        break;
+      }
+    }
+
     // add block to alternate blocks storage,
     // as well as the current "alt chain" container
     CHECK_AND_ASSERT_MES(!m_db->get_alt_block(id, NULL, NULL), false, "insertion of new alternative block returned as it already exists");
diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index 3a6a3833d..648e691d0 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -518,6 +518,59 @@ namespace cryptonote
     return true;
   }
   //---------------------------------------------------------------------------------
+  bool tx_memory_pool::get_transaction_info(const crypto::hash &txid, tx_details &td) const
+  {
+    PERF_TIMER(get_transaction_info);
+    CRITICAL_REGION_LOCAL(m_transactions_lock);
+    CRITICAL_REGION_LOCAL1(m_blockchain);
+
+    try
+    {
+      LockedTXN lock(m_blockchain);
+      txpool_tx_meta_t meta;
+      if (!m_blockchain.get_txpool_tx_meta(txid, meta))
+      {
+        MERROR("Failed to find tx in txpool");
+        return false;
+      }
+      cryptonote::blobdata txblob = m_blockchain.get_txpool_tx_blob(txid);
+      auto ci = m_parsed_tx_cache.find(txid);
+      if (ci != m_parsed_tx_cache.end())
+      {
+        td.tx = ci->second;
+      }
+      else if (!(meta.pruned ? parse_and_validate_tx_base_from_blob(txblob, td.tx) : parse_and_validate_tx_from_blob(txblob, td.tx)))
+      {
+        MERROR("Failed to parse tx from txpool");
+        return false;
+      }
+      else
+      {
+        td.tx.set_hash(txid);
+      }
+      td.blob_size = txblob.size();
+      td.weight = meta.weight;
+      td.fee = meta.fee;
+      td.max_used_block_id = meta.max_used_block_id;
+      td.max_used_block_height = meta.max_used_block_height;
+      td.kept_by_block = meta.kept_by_block;
+      td.last_failed_height = meta.last_failed_height;
+      td.last_failed_id = meta.last_failed_id;
+      td.receive_time = meta.receive_time;
+      td.last_relayed_time = meta.last_relayed_time;
+      td.relayed = meta.relayed;
+      td.do_not_relay = meta.do_not_relay;
+      td.double_spend_seen = meta.double_spend_seen;
+    }
+    catch (const std::exception &e)
+    {
+      MERROR("Failed to get tx from txpool: " << e.what());
+      return false;
+    }
+
+    return true;
+  }
+  //---------------------------------------------------------------------------------
   void tx_memory_pool::on_idle()
   {
     m_remove_stuck_tx_interval.do_call([this](){return remove_stuck_transactions();});
diff --git a/src/cryptonote_core/tx_pool.h b/src/cryptonote_core/tx_pool.h
index 99182cd0d..dec7e3cd9 100644
--- a/src/cryptonote_core/tx_pool.h
+++ b/src/cryptonote_core/tx_pool.h
@@ -429,6 +429,11 @@ namespace cryptonote
       bool double_spend_seen; //!< true iff another tx was seen double spending this one
     };
 
+    /**
+     * @brief get infornation about a single transaction
+     */
+    bool get_transaction_info(const crypto::hash &txid, tx_details &td) const;
+
   private:
 
     /**