diff --git a/depends/packages/libsnark.mk b/depends/packages/libsnark.mk
index d0d31097e..26d8f6677 100644
--- a/depends/packages/libsnark.mk
+++ b/depends/packages/libsnark.mk
@@ -1,10 +1,10 @@
 package=libsnark
 $(package)_version=0.1
-$(package)_download_path=https://github.com/radix42/$(package)/archive/
+$(package)_download_path=https://supernetorg.bintray.com/misc/
 $(package)_file_name=$(package)-$($(package)_git_commit).tar.gz
-$(package)_download_file=$($(package)_git_commit).tar.gz
-$(package)_sha256_hash=9dbd5b44d3443e86463e934bfe1023cab4ca5948f8d74c23a67d9535c28d2584
-$(package)_git_commit=9be18569b8abcda1245c3912877075259599c0f1
+$(package)_download_file=$(package)-$($(package)_git_commit).tar.gz
+$(package)_sha256_hash=47478adc2ae88c448dc736d59dfe007de6478e41e88d2d4d2ff4135a17ee6f90
+$(package)_git_commit=3854b20c25e8bc567aab2b558dec84d45f4a3e73
 
 $(package)_dependencies=libgmp libsodium
 
diff --git a/src/komodo.h b/src/komodo.h
index e81522eb5..e1e40448d 100644
--- a/src/komodo.h
+++ b/src/komodo.h
@@ -16,6 +16,10 @@
 #ifndef H_KOMODO_H
 #define H_KOMODO_H
 
+#ifdef _WIN32
+#define printf(...)
+#endif
+
 // Todo:
 // verify: reorgs
 
diff --git a/src/main.cpp b/src/main.cpp
index c14fd7995..1e9be1a06 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -49,6 +49,7 @@ using namespace std;
  */
 
 CCriticalSection cs_main;
+extern uint8_t NOTARY_PUBKEY33[33];
 
 BlockMap mapBlockIndex;
 CChain chainActive;
@@ -4494,7 +4495,14 @@ void static ProcessGetData(CNode* pfrom)
                     else
                     {
                         if (inv.type == MSG_BLOCK)
+                        {
+                            //uint256 hash; int32_t z;
+                            //hash = block.GetHash();
+                            //for (z=31; z>=0; z--)
+                            //    fprintf(stderr,"%02x",((uint8_t *)&hash)[z]);
+                            //fprintf(stderr," send block %d\n",komodo_block2height(&block));
                             pfrom->PushMessage("block", block);
+                        }
                         else // MSG_FILTERED_BLOCK)
                         {
                             LOCK(pfrom->cs_filter);
@@ -4583,6 +4591,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
 {
     const CChainParams& chainparams = Params();
     LogPrint("net", "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->id);
+    //fprintf(stderr, "recv: %s peer=%d\n", SanitizeString(strCommand).c_str(), (int32_t)pfrom->GetId());
     if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
     {
         LogPrintf("dropmessagestest DROPPING RECV MESSAGE\n");
@@ -4956,13 +4965,19 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         vector<CBlock> vHeaders;
         int nLimit = MAX_HEADERS_RESULTS;
         LogPrint("net", "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString(), pfrom->id);
-        for (; pindex; pindex = chainActive.Next(pindex))
+        if ( pfrom->lasthdrsreq >= chainActive.Height()-MAX_HEADERS_RESULTS || pfrom->lasthdrsreq != (int32_t)(pindex ? pindex->nHeight : -1) )
         {
-            vHeaders.push_back(pindex->GetBlockHeader());
-            if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
-                break;
+            pfrom->lasthdrsreq = (int32_t)(pindex ? pindex->nHeight : -1);
+            for (; pindex; pindex = chainActive.Next(pindex))
+            {
+                vHeaders.push_back(pindex->GetBlockHeader());
+                if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
+                    break;
+            }
+            pfrom->PushMessage("headers", vHeaders);
         }
-        pfrom->PushMessage("headers", vHeaders);
+        else if ( NOTARY_PUBKEY33[0] != 0 )
+            fprintf(stderr,"you can ignore redundant getheaders from peer.%d %d prev.%d\n",(int32_t)pfrom->id,(int32_t)(pindex ? pindex->nHeight : -1),pfrom->lasthdrsreq);
     }
 
 
@@ -5143,8 +5158,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             // Headers message had its maximum size; the peer may have more headers.
             // TODO: optimize: if pindexLast is an ancestor of chainActive.Tip or pindexBestHeader, continue
             // from there instead.
-            LogPrint("net", "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->id, pfrom->nStartingHeight);
-            pfrom->PushMessage("getheaders", chainActive.GetLocator(pindexLast), uint256());
+            if ( pfrom->sendhdrsreq >= chainActive.Height()-MAX_HEADERS_RESULTS || pindexLast->nHeight != pfrom->sendhdrsreq )
+            {
+                pfrom->sendhdrsreq = (int32_t)pindexLast->nHeight;
+                LogPrint("net", "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->id, pfrom->nStartingHeight);
+                pfrom->PushMessage("getheaders", chainActive.GetLocator(pindexLast), uint256());
+            }
         }
 
         CheckBlockIndex();
diff --git a/src/net.h b/src/net.h
index f7ebf11f6..bb79acf17 100644
--- a/src/net.h
+++ b/src/net.h
@@ -264,6 +264,7 @@ public:
     std::string addrName;
     CService addrLocal;
     int nVersion;
+    int lasthdrsreq,sendhdrsreq;
     // strSubVer is whatever byte array we read from the wire. However, this field is intended
     // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
     // store the sanitized version in cleanSubVer. The original should be used when dealing with
diff --git a/src/util.cpp b/src/util.cpp
index 4c901d586..c2d299e20 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -604,7 +604,14 @@ boost::filesystem::path GetConfigFile()
     char confname[512];
     if ( ASSETCHAINS_SYMBOL[0] != 0 )
         sprintf(confname,"%s.conf",ASSETCHAINS_SYMBOL);
-    else strcpy(confname,"komodo.conf");
+    else
+    {
+#ifdef __APPLE__
+        strcpy(confname,"Komodo.conf");
+#else
+        strcpy(confname,"komodo.conf");
+#endif
+    }
     boost::filesystem::path pathConfigFile(GetArg("-conf",confname));
     if (!pathConfigFile.is_complete())
         pathConfigFile = GetDataDir(false) / pathConfigFile;