diff --git a/src/server/poolserver/Stratum/Client.cpp b/src/server/poolserver/Stratum/Client.cpp
index 4bf1906..fde4a79 100644
--- a/src/server/poolserver/Stratum/Client.cpp
+++ b/src/server/poolserver/Stratum/Client.cpp
@@ -166,9 +166,13 @@ namespace Stratum
             return;
         }
         
-        ByteBuffer share;
-        share << extranonce2 << timebuf << noncebuf;
-        if (!job.SubmitShare(share.Binary())) {
+        // Pack two 32bit ints into 64bit
+        ByteBuffer sharebuf;
+        sharebuf << noncebuf << extranonce2;
+        uint64 share;
+        sharebuf >> share;
+        sLog.Debug(LOG_STRATUM, "Job::SubmitShare: Nonce: %s, Extranonse: %s, Share: %u", Util::BinToASCII(noncebuf.Binary()).c_str(), Util::BinToASCII(extranonce2).c_str(), share);
+        if (!job.SubmitShare(share)) {
             sLog.Error(LOG_STRATUM, "%s: Duplicate share", username.c_str());
             DataMgr::Instance()->Push(Share(_ip, username, false, "Duplicate share", Util::Date(), job.diff));
             _shareLimiter.LogBad();
@@ -209,7 +213,7 @@ namespace Stratum
         BigInt target(Util::BinToASCII(Util::Reverse(hash)), 16);
         
         // Check if difficulty meets job diff
-        if (target > job.target) {
+        if (target > job.jobTarget) {
             sLog.Error(LOG_STRATUM, "%s: Share above target", username.c_str());
             DataMgr::Instance()->Push(Share(_ip, username, false, "Share above target", Util::Date(), job.diff));
             _shareLimiter.LogBad();
@@ -225,7 +229,7 @@ namespace Stratum
         }
         
         // Check if block meets criteria
-        if (target <= job.blockCriteria) {
+        if (target <= job.blockTarget) {
             sLog.Info(LOG_SERVER, "We have found a block candidate!");
             
             if (_server->SubmitBlock(block)) {
@@ -317,7 +321,8 @@ namespace Stratum
         Job job;
         job.block = _server->GetWork();
         job.diff = _diff;
-        job.target = Bitcoin::DiffToTarget(job.diff);
+        job.jobTarget = Bitcoin::DiffToTarget(job.diff);
+        job.blockTarget = Bitcoin::TargetFromBits(job.block->bits);
         
         // Serialize transaction
         ByteBuffer coinbasebuf;
@@ -334,8 +339,6 @@ namespace Stratum
         job.coinbase1 = BinaryData(coinbase.begin(), coinbase.begin() + cbsplit);
         job.coinbase2 = BinaryData(coinbase.begin() + cbsplit + 8, coinbase.end()); // plus extranonce size
         
-        job.blockCriteria = Bitcoin::TargetFromBits(job.block->bits);
-        
         return job;
     }
     
diff --git a/src/server/poolserver/Stratum/Job.h b/src/server/poolserver/Stratum/Job.h
index e6d8e41..26aba4b 100644
--- a/src/server/poolserver/Stratum/Job.h
+++ b/src/server/poolserver/Stratum/Job.h
@@ -16,18 +16,17 @@ namespace Stratum
         Bitcoin::BlockPtr block;
         BinaryData coinbase1;
         BinaryData coinbase2;
-        std::set<std::string> shares;
-        BigInt blockCriteria;
-        BigInt target;
+        std::set<uint64> shares;
+        BigInt blockTarget;
+        BigInt jobTarget;
         
         // Submits share to a job
         // Returns false if the same share already exists
-        bool SubmitShare(BinaryData share)
+        bool SubmitShare(uint64 share)
         {
-            std::string sharestr = Util::BinToASCII(Crypto::SHA256(share));
-            std::set<std::string>::iterator it = shares.find(sharestr);
+            std::set<uint64>::iterator it = shares.find(share);
             if (it == shares.end()) {
-                shares.insert(sharestr);
+                shares.insert(share);
                 return true;
             } else
                 return false;