diff --git a/src/chain.h b/src/chain.h
--- a/src/chain.h
+++ b/src/chain.h
@@ -237,6 +237,9 @@
     //! blocks are received.
     int32_t nSequenceId;
 
+    //! (memory only) block header metadata
+    uint64_t nTimeReceived;
+
     //! (memory only) Maximum nTime in the chain upto and including this block.
     unsigned int nTimeMax;
 
@@ -258,6 +261,7 @@
         nVersion = 0;
         hashMerkleRoot = uint256();
         nTime = 0;
+        nTimeReceived = 0;
         nBits = 0;
         nNonce = 0;
     }
@@ -270,6 +274,11 @@
         nVersion = block.nVersion;
         hashMerkleRoot = block.hashMerkleRoot;
         nTime = block.nTime;
+        // Default to block time if nTimeReceived is never set, which
+        // in effect assumes that this block is honestly mined.
+        // Note that nTimeReceived isn't written to disk, so blocks read from
+        // disk will be assumed to be honestly mined.
+        nTimeReceived = block.nTime;
         nBits = block.nBits;
         nNonce = block.nNonce;
     }
@@ -311,6 +320,8 @@
 
     int64_t GetBlockTimeMax() const { return int64_t(nTimeMax); }
 
+    int64_t GetHeaderTimeReceived() const { return nTimeReceived; }
+
     enum { nMedianTimeSpan = 11 };
 
     int64_t GetMedianTimePast() const {