scanback check to prevent adding to the 74638 overflow chain

@@ -1393,7 +1393,16 @@ bool CBlock::AcceptBlock()
         (pindexPrev->nHeight+1 == 68555 && hash != uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a")) ||
         (pindexPrev->nHeight+1 == 70567 && hash != uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a")) ||
         (pindexPrev->nHeight+1 == 74000 && hash != uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")))
-        return error("AcceptBlock() : rejected by checkpoint lockin");
+        return error("AcceptBlock() : rejected by checkpoint lockin at %d", pindexPrev->nHeight+1);
+
+    // Scanback checkpoint lockin
+    for (CBlockIndex* pindex = pindexPrev; pindex->nHeight >= 74000; pindex = pindex->pprev)
+    {
+        if (pindex->nHeight == 74000 && pindex->GetBlockHash() != uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
+            return error("AcceptBlock() : rejected by scanback lockin at %d", pindex->nHeight);
+        if (pindex->nHeight == 74638 && pindex->GetBlockHash() == uint256("0x0000000000790ab3f22ec756ad43b6ab569abf0bddeb97c67a6f7b1470a7ec1c"))
+            return error("AcceptBlock() : rejected by scanback lockin at %d", pindex->nHeight);
+    }
 
     // Write block to history file
     if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK)))

@@ -20,7 +20,7 @@ class CDataStream;
 class CAutoFile;
 
 static const int VERSION = 310;
-static const char* pszSubVer = ".0";
+static const char* pszSubVer = ".1";