diff --git a/src/daemon/MoneroDaemonModel.cpp b/src/daemon/MoneroDaemonModel.cpp
index c66b020..635fb5a 100644
--- a/src/daemon/MoneroDaemonModel.cpp
+++ b/src/daemon/MoneroDaemonModel.cpp
@@ -175,7 +175,8 @@ namespace monero {
 
   // ------------------------------- MONERO TX --------------------------------
 
-  shared_ptr<MoneroTx> MoneroTx::copy(const shared_ptr<MoneroTx>& self) const {
+  shared_ptr<MoneroTx> MoneroTx::copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const {
+    MTRACE("MoneroTx::copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt)");
     throw runtime_error("MoneroTx::copy() not implemented");
   }
 
@@ -370,7 +371,7 @@ namespace monero {
 
   // ------------------------------ MONERO OUTPUT -----------------------------
 
-  shared_ptr<MoneroOutput> MoneroOutput::copy(const shared_ptr<MoneroOutput>& self) const {
+  shared_ptr<MoneroOutput> MoneroOutput::copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const {
     throw runtime_error("MoneroOutput::copy() not implemented");
   }
 
diff --git a/src/daemon/MoneroDaemonModel.h b/src/daemon/MoneroDaemonModel.h
index 3c4d498..d3b1f87 100644
--- a/src/daemon/MoneroDaemonModel.h
+++ b/src/daemon/MoneroDaemonModel.h
@@ -192,7 +192,7 @@ namespace monero {
     boost::optional<string> maxUsedBlockId;
     vector<string> signatures;
 
-    shared_ptr<MoneroTx> copy(const shared_ptr<MoneroTx>& self) const;
+    shared_ptr<MoneroTx> copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const;
     boost::property_tree::ptree toPropertyTree() const;
     virtual void merge(const shared_ptr<MoneroTx>& self, const shared_ptr<MoneroTx>& other);
     boost::optional<uint64_t> getHeight() const;
@@ -220,7 +220,7 @@ namespace monero {
     vector<uint32_t> ringOutputIndices;
     boost::optional<string> stealthPublicKey;
 
-    shared_ptr<MoneroOutput> copy(const shared_ptr<MoneroOutput>& self) const;
+    shared_ptr<MoneroOutput> copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const;
     boost::property_tree::ptree toPropertyTree() const;
     virtual void merge(const shared_ptr<MoneroOutput>& self, const shared_ptr<MoneroOutput>& other);
   };
diff --git a/src/wallet/MoneroWallet.cpp b/src/wallet/MoneroWallet.cpp
index 37abe12..b884318 100644
--- a/src/wallet/MoneroWallet.cpp
+++ b/src/wallet/MoneroWallet.cpp
@@ -1391,20 +1391,38 @@ namespace monero {
     }
 
     // copy and normalize request
+    MTRACE("initializing shared pointer");
     shared_ptr<MoneroTransferRequest> req;
-    if (request.txRequest == boost::none) req = request.copy(make_shared<MoneroTransferRequest>(request));
+    if (request.txRequest == boost::none) {
+        MTRACE("copying transfer request");
+        req = request.copy(make_shared<MoneroTransferRequest>(request), shared_ptr<MoneroTransferRequest>());
+        MTRACE("done copying request!!!");
+    }
     else {
-      shared_ptr<MoneroTxRequest> txReq = request.txRequest.get()->copy(request.txRequest.get());
-      if (request.txRequest.get()->transferRequest.get().get() == &request) req = txReq->transferRequest.get();
+        MTRACE("copying tx request");
+      shared_ptr<MoneroTxRequest> txReq = request.txRequest.get()->copy(request.txRequest.get(), shared_ptr<MoneroTxRequest>());
+      MTRACE("1");
+      if (request.txRequest.get()->transferRequest.get().get() == &request) {
+          req = txReq->transferRequest.get();
+          MTRACE("2");
+      }
       else {
+          MTRACE("3");
         if (request.txRequest.get()->transferRequest != boost::none) throw new runtime_error("Transfer request's tx request must be a circular reference or null");
-        req = request.copy(make_shared<MoneroTransferRequest>(request));
+        MTRACE("4");
+        req = request.copy(make_shared<MoneroTransferRequest>(request), shared_ptr<MoneroTransferRequest>());
+        MTRACE("5");
         req->txRequest = txReq;
+        MTRACE("6");
       }
     }
+    MTRACE("7");
     if (req->txRequest == boost::none) req->txRequest = shared_ptr<MoneroTxRequest>();
+    MTRACE("8");
     shared_ptr<MoneroTxRequest> txReq = req->txRequest.get();
+    MTRACE("9");
     txReq->transferRequest = boost::none; // break circular link for meetsCriteria()
+    MTRACE("10");
 
 //    // copy and normalize request
 //    MoneroTransferRequest req;
diff --git a/src/wallet/MoneroWalletModel.cpp b/src/wallet/MoneroWalletModel.cpp
index 6694dc6..05d7e43 100644
--- a/src/wallet/MoneroWalletModel.cpp
+++ b/src/wallet/MoneroWalletModel.cpp
@@ -105,11 +105,17 @@ namespace monero {
 
   // --------------------------- MONERO TX WALLET -----------------------------
 
-  shared_ptr<MoneroTxWallet> MoneroTxWallet::copy(const shared_ptr<MoneroTx>& self) const {
-    throw runtime_error("MoneroOutputWallet::copy(tx) not implemented");
+  shared_ptr<MoneroTxWallet> MoneroTxWallet::copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const {
+    return MoneroTxWallet::copy(static_pointer_cast<MoneroTxWallet>(src), static_pointer_cast<MoneroTxWallet>(tgt));
   };
 
-  shared_ptr<MoneroTxWallet> MoneroTxWallet::copy(const shared_ptr<MoneroTxWallet>& self) const {
+  shared_ptr<MoneroTxWallet> MoneroTxWallet::copy(const shared_ptr<MoneroTxWallet>& src, const shared_ptr<MoneroTxWallet>& tgt) const {
+    MTRACE("MoneroTxWallet::copy(const shared_ptr<MoneroTxWallet>& src, const shared_ptr<MoneroTxWallet>& tgt)");
+    if (this != src.get()) throw runtime_error("this != src");
+
+    // copy base class
+    MoneroTx::copy(static_pointer_cast<MoneroTx>(src), static_pointer_cast<MoneroTx>(tgt));
+
     throw runtime_error("MoneroTxWallet::copy(txWallet) not implemented");
   };
 
@@ -161,15 +167,22 @@ namespace monero {
 
   // -------------------------- MONERO TX REQUEST -----------------------------
 
-  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTx>& self) const {
-    throw runtime_error("MoneroOutputWallet::copy(tx) not implemented");
+  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const {
+    return copy(static_pointer_cast<MoneroTxRequest>(src), static_pointer_cast<MoneroTxRequest>(tgt));
   };
 
-  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTxWallet>& self) const {
-    throw runtime_error("MoneroTxRequest::copy(txWallet) not implemented");
+  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTxWallet>& src, const shared_ptr<MoneroTxWallet>& tgt) const {
+    return copy(static_pointer_cast<MoneroTxRequest>(src), static_pointer_cast<MoneroTxRequest>(tgt));
   };
 
-  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTxRequest>& self) const {
+  shared_ptr<MoneroTxRequest> MoneroTxRequest::copy(const shared_ptr<MoneroTxRequest>& src, const shared_ptr<MoneroTxRequest>& tgt) const {
+    MTRACE("MoneroTxRequest::copy(const shared_ptr<MoneroTxRequest>& src, const shared_ptr<MoneroTxRequest>& tgt)");
+    if (this != src.get()) throw runtime_error("this != src");
+
+    // copy base class
+    MTRACE("copying base");
+    MoneroTxWallet::copy(static_pointer_cast<MoneroTx>(src), static_pointer_cast<MoneroTx>(tgt));
+
     throw runtime_error("MoneroTxRequest::copy(txRequest) not implemented");
   };
 
@@ -250,9 +263,9 @@ namespace monero {
 
   // ---------------------------- MONERO TRANSFER -----------------------------
 
-//  shared_ptr<MoneroTransfer> MoneroTransfer::copy(const shared_ptr<MoneroTransfer>& self) const {
-//    throw runtime_error("MoneroTransfer::copy() not implemented");
-//  };
+  shared_ptr<MoneroTransfer> MoneroTransfer::copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const {
+    throw runtime_error("MoneroTransfer::copy() not implemented");
+  };
 
   boost::property_tree::ptree MoneroTransfer::toPropertyTree() const {
     boost::property_tree::ptree node;
@@ -288,11 +301,11 @@ namespace monero {
 
   // ----------------------- MONERO INCOMING TRANSFER -------------------------
 
-  shared_ptr<MoneroIncomingTransfer> MoneroIncomingTransfer::copy(const shared_ptr<MoneroTransfer>& self) const {
+  shared_ptr<MoneroIncomingTransfer> MoneroIncomingTransfer::copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const {
     throw runtime_error("MoneroIncomingTransfer::copy(transfer) not implemented");
   };
 
-  shared_ptr<MoneroIncomingTransfer> MoneroIncomingTransfer::copy(const shared_ptr<MoneroIncomingTransfer>& self) const {
+  shared_ptr<MoneroIncomingTransfer> MoneroIncomingTransfer::copy(const shared_ptr<MoneroIncomingTransfer>& src, const shared_ptr<MoneroIncomingTransfer>& tgt) const {
     throw runtime_error("MoneroIncomingTransfer::copy(inTransfer) not implemented");
   };
 
@@ -318,11 +331,11 @@ namespace monero {
 
   // ----------------------- MONERO OUTGOING TRANSFER -------------------------
 
-  shared_ptr<MoneroOutgoingTransfer> MoneroOutgoingTransfer::copy(const shared_ptr<MoneroTransfer>& self) const {
+  shared_ptr<MoneroOutgoingTransfer> MoneroOutgoingTransfer::copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const {
     throw runtime_error("MoneroOutgoingTransfer::copy(transfer) not implemented");
   };
 
-  shared_ptr<MoneroOutgoingTransfer> MoneroOutgoingTransfer::copy(const shared_ptr<MoneroOutgoingTransfer>& self) const {
+  shared_ptr<MoneroOutgoingTransfer> MoneroOutgoingTransfer::copy(const shared_ptr<MoneroOutgoingTransfer>& src, const shared_ptr<MoneroOutgoingTransfer>& tgt) const {
     throw runtime_error("MoneroOutgoingTransfer::copy(outTransfer) not implemented");
   };
 
@@ -350,11 +363,13 @@ namespace monero {
 
   // ----------------------- MONERO TRANSFER REQUEST --------------------------
 
-  shared_ptr<MoneroTransferRequest> MoneroTransferRequest::copy(const shared_ptr<MoneroTransfer>& self) const {
+  shared_ptr<MoneroTransferRequest> MoneroTransferRequest::copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const {
+    MTRACE("MoneroTransferRequest::copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt");
     throw runtime_error("MoneroTransferRequest::copy(transfer) not implemented");
   };
 
-  shared_ptr<MoneroTransferRequest> MoneroTransferRequest::copy(const shared_ptr<MoneroTransferRequest>& self) const {
+  shared_ptr<MoneroTransferRequest> MoneroTransferRequest::copy(const shared_ptr<MoneroTransferRequest>& src, const shared_ptr<MoneroTransferRequest>& tgt) const {
+    MTRACE("MoneroTransferRequest::copy(const shared_ptr<MoneroTransferRequest>& src, const shared_ptr<MoneroTransferRequest>& tgt)");
     throw runtime_error("MoneroTransferRequest::copy(request) not implemented");
   };
 
@@ -446,11 +461,18 @@ namespace monero {
 
   // ------------------------- MONERO OUTPUT WALLET ---------------------------
 
-  shared_ptr<MoneroOutputWallet> MoneroOutputWallet::copy(const shared_ptr<MoneroOutput>& self) const {
-    throw runtime_error("MoneroOutputWallet::copy(output) not implemented");
+  shared_ptr<MoneroOutputWallet> MoneroOutputWallet::copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const {
+    MTRACE("MoneroOutputWallet::copy(output)");
+    return MoneroOutputWallet::copy(static_pointer_cast<MoneroOutputWallet>(src), static_pointer_cast<MoneroOutputWallet>(tgt));
   };
 
-  shared_ptr<MoneroOutputWallet> MoneroOutputWallet::copy(const shared_ptr<MoneroOutputWallet>& self) const {
+  shared_ptr<MoneroOutputWallet> MoneroOutputWallet::copy(const shared_ptr<MoneroOutputWallet>& src, const shared_ptr<MoneroOutputWallet>& tgt) const {
+    MTRACE("MoneroOutputWallet::copy(outputWallet)");
+    if (this != src.get()) throw runtime_error("this != src");
+
+    // copy base class
+    MoneroOutputWallet::copy(static_pointer_cast<MoneroOutput>(src), static_pointer_cast<MoneroOutput>(tgt));
+
     throw runtime_error("MoneroOutputWallet::copy(outputWallet) not implemented");
   };
 
@@ -474,15 +496,15 @@ namespace monero {
 
   // ------------------------ MONERO OUTPUT REQUEST ---------------------------
 
-  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutput>& self) const {
+  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const {
     throw runtime_error("MoneroOutputRequest::copy(output) not implemented");
   };
 
-  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutputWallet>& self) const {
+  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutputWallet>& src, const shared_ptr<MoneroOutputWallet>& tgt) const {
     throw runtime_error("MoneroOutputRequest::copy(outputWallet) not implemented");
   };
 
-  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutputRequest>& self) const {
+  shared_ptr<MoneroOutputRequest> MoneroOutputRequest::copy(const shared_ptr<MoneroOutputRequest>& src, const shared_ptr<MoneroOutputRequest>& tgt) const {
     throw runtime_error("MoneroOutputRequest::copy(outputRequest) not implemented");
   };
 
diff --git a/src/wallet/MoneroWalletModel.h b/src/wallet/MoneroWalletModel.h
index a8fea09..879f196 100644
--- a/src/wallet/MoneroWalletModel.h
+++ b/src/wallet/MoneroWalletModel.h
@@ -148,9 +148,7 @@ namespace monero {
     boost::optional<uint32_t> numSuggestedConfirmations;
 
     virtual boost::optional<bool> getIsIncoming() const = 0;  // derived class must implement
-    shared_ptr<MoneroTransfer> copy(const shared_ptr<MoneroTransfer>& self) const { // not virtual in order for subclasses to return shared_ptr of derived types
-      throw runtime_error("Subclasses must implement");
-    };
+    shared_ptr<MoneroTransfer> copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const;
     boost::optional<bool> getIsOutgoing() const {
 			if (getIsIncoming() == boost::none) return boost::none;
       return !(*getIsIncoming());
@@ -166,8 +164,8 @@ namespace monero {
     boost::optional<uint32_t> subaddressIndex;
     boost::optional<string> address;
 
-    shared_ptr<MoneroIncomingTransfer> copy(const shared_ptr<MoneroTransfer>& self) const;
-    shared_ptr<MoneroIncomingTransfer> copy(const shared_ptr<MoneroIncomingTransfer>& self) const;
+    shared_ptr<MoneroIncomingTransfer> copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const;
+    shared_ptr<MoneroIncomingTransfer> copy(const shared_ptr<MoneroIncomingTransfer>& src, const shared_ptr<MoneroIncomingTransfer>& tgt) const;
     boost::optional<bool> getIsIncoming() const;
     boost::property_tree::ptree toPropertyTree() const;
     void merge(const shared_ptr<MoneroTransfer>& self, const shared_ptr<MoneroTransfer>& other);
@@ -182,8 +180,8 @@ namespace monero {
     vector<string> addresses;
     vector<shared_ptr<MoneroDestination>> destinations;
 
-    shared_ptr<MoneroOutgoingTransfer> copy(const shared_ptr<MoneroTransfer>& self) const;
-    shared_ptr<MoneroOutgoingTransfer> copy(const shared_ptr<MoneroOutgoingTransfer>& self) const;
+    shared_ptr<MoneroOutgoingTransfer> copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const;
+    shared_ptr<MoneroOutgoingTransfer> copy(const shared_ptr<MoneroOutgoingTransfer>& src, const shared_ptr<MoneroOutgoingTransfer>& tgt) const;
     boost::optional<bool> getIsIncoming() const;
     boost::property_tree::ptree toPropertyTree() const;
     void merge(const shared_ptr<MoneroTransfer>& self, const shared_ptr<MoneroTransfer>& other);
@@ -205,8 +203,8 @@ namespace monero {
     boost::optional<bool> hasDestinations;
     boost::optional<shared_ptr<MoneroTxRequest>> txRequest;
 
-    shared_ptr<MoneroTransferRequest> copy(const shared_ptr<MoneroTransfer>& self) const;
-    shared_ptr<MoneroTransferRequest> copy(const shared_ptr<MoneroTransferRequest>& self) const;
+    shared_ptr<MoneroTransferRequest> copy(const shared_ptr<MoneroTransfer>& src, const shared_ptr<MoneroTransfer>& tgt) const;
+    shared_ptr<MoneroTransferRequest> copy(const shared_ptr<MoneroTransferRequest>& src, const shared_ptr<MoneroTransferRequest>& tgt) const;
     boost::optional<bool> getIsIncoming() const;
     boost::property_tree::ptree toPropertyTree() const;
     bool meetsCriteria(MoneroTransfer* transfer) const;
@@ -222,8 +220,8 @@ namespace monero {
     boost::optional<bool> isUnlocked;
     boost::optional<bool> isFrozen;
 
-    shared_ptr<MoneroOutputWallet> copy(const shared_ptr<MoneroOutput>& self) const;
-    shared_ptr<MoneroOutputWallet> copy(const shared_ptr<MoneroOutputWallet>& self) const;
+    shared_ptr<MoneroOutputWallet> copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const;
+    shared_ptr<MoneroOutputWallet> copy(const shared_ptr<MoneroOutputWallet>& src, const shared_ptr<MoneroOutputWallet>& tgt) const;
     boost::property_tree::ptree toPropertyTree() const;
     void merge(const shared_ptr<MoneroOutput>& self, const shared_ptr<MoneroOutput>& other);
     void merge(const shared_ptr<MoneroOutputWallet>& self, const shared_ptr<MoneroOutputWallet>& other);
@@ -240,9 +238,9 @@ namespace monero {
     boost::optional<shared_ptr<MoneroTxRequest>> txRequest;
 
     // TODO: necessary to override all super classes?
-    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutput>& self) const;
-    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutputWallet>& self) const;
-    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutputRequest>& self) const;
+    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutput>& src, const shared_ptr<MoneroOutput>& tgt) const;
+    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutputWallet>& src, const shared_ptr<MoneroOutputWallet>& tgt) const;
+    shared_ptr<MoneroOutputRequest> copy(const shared_ptr<MoneroOutputRequest>& src, const shared_ptr<MoneroOutputRequest>& tgt) const;
     boost::property_tree::ptree toPropertyTree() const;
     bool meetsCriteria(MoneroOutputWallet* output) const;
   };
@@ -255,8 +253,8 @@ namespace monero {
     boost::optional<shared_ptr<MoneroOutgoingTransfer>> outgoingTransfer;
     boost::optional<string> note;
 
-    shared_ptr<MoneroTxWallet> copy(const shared_ptr<MoneroTx>& self) const;
-    shared_ptr<MoneroTxWallet> copy(const shared_ptr<MoneroTxWallet>& self) const;
+    shared_ptr<MoneroTxWallet> copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const;
+    shared_ptr<MoneroTxWallet> copy(const shared_ptr<MoneroTxWallet>& src, const shared_ptr<MoneroTxWallet>& tgt) const;
     bool getIsIncoming() const;
     bool getIsOutgoing() const;
     boost::property_tree::ptree toPropertyTree() const;
@@ -283,9 +281,9 @@ namespace monero {
     boost::optional<shared_ptr<MoneroOutputRequest>> outputRequest;
 
     // TODO: necessary to override all super classes?
-    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTx>& self) const;
-    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTxWallet>& self) const;
-    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTxRequest>& self) const;
+    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTx>& src, const shared_ptr<MoneroTx>& tgt) const;
+    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTxWallet>& src, const shared_ptr<MoneroTxWallet>& tgt) const;
+    shared_ptr<MoneroTxRequest> copy(const shared_ptr<MoneroTxRequest>& src, const shared_ptr<MoneroTxRequest>& tgt) const;
     boost::property_tree::ptree toPropertyTree() const;
     bool meetsCriteria(MoneroTxWallet* tx) const;
   };