diff --git a/src/masternodeman.cpp b/src/masternodeman.cpp
index 2b6993ae35..002a9f031c 100644
--- a/src/masternodeman.cpp
+++ b/src/masternodeman.cpp
@@ -481,6 +481,24 @@ void CMasternodeMan::ProcessMessage(CNode* pfrom, std::string& strCommand, CData
                 return;
             }
 
+            // verify that sig time is legit in past
+            // should be at least not earlier than block when 1000 DRK tx got MASTERNODE_MIN_CONFIRMATIONS
+            uint256 hashBlock = 0;
+            GetTransaction(vin.prevout.hash, tx, hashBlock, true);
+            map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
+            if (mi != mapBlockIndex.end() && (*mi).second)
+            {
+                CBlockIndex* pMNIndex = (*mi).second; // block for 1000 DRK tx -> 1 confirmation
+                CBlockIndex* pConfIndex = chainActive[pMNIndex->nHeight + MASTERNODE_MIN_CONFIRMATIONS - 1]; // block where tx got MASTERNODE_MIN_CONFIRMATIONS
+                if(pConfIndex->GetBlockTime() > sigTime)
+                {
+                    LogPrintf("dsee - Bad sigTime %d for masternode %20s %105s (%i conf block is at %d)\n",
+                              sigTime, addr.ToString(), vin.ToString(), MASTERNODE_MIN_CONFIRMATIONS, pConfIndex->GetBlockTime());
+                    return;
+                }
+            }
+
+
             // use this as a peer
             addrman.Add(CAddress(addr), pfrom->addr, 2*60*60);