Merge pull request #1140

bba6af9 wallet: cold wallet transaction signing (moneromooo-monero)
9872dcb wallet: fix log confusion between bytes and kilobytes (moneromooo-monero)
d9b0bf9 cryptonote_core: make extra field removal more generic (moneromooo-monero)
98f19d4 serialization: add support for serializing std::pair and std::list (moneromooo-monero)

10 files changed, 852 insertions, 136 deletions

diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index d1ccfc7d1..64f8eb924 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -366,7 +366,7 @@ namespace cryptonote
     return true;
   }
   //---------------------------------------------------------------
-  bool remove_extra_nonce_tx_extra(std::vector<uint8_t>& tx_extra)
+  bool remove_field_from_tx_extra(std::vector<uint8_t>& tx_extra, const std::type_info &type)
   {
     std::string extra_str(reinterpret_cast<const char*>(tx_extra.data()), tx_extra.size());
     std::istringstream iss(extra_str);
@@ -380,7 +380,7 @@ namespace cryptonote
       tx_extra_field field;
       bool r = ::do_serialize(ar, field);
       CHECK_AND_NO_ASSERT_MES_L1(r, false, "failed to deserialize extra field. extra = " << string_tools::buff_to_hex_nodelimer(std::string(reinterpret_cast<const char*>(tx_extra.data()), tx_extra.size())));
-      if (field.type() != typeid(tx_extra_nonce))
+      if (field.type() != type)
         ::do_serialize(newar, field);
 
       std::ios_base::iostate state = iss.rdstate();
@@ -472,10 +472,7 @@ namespace cryptonote
   bool construct_tx_and_get_tx_key(const account_keys& sender_account_keys, const std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, std::vector<uint8_t> extra, transaction& tx, uint64_t unlock_time, crypto::secret_key &tx_key, bool rct)
   {
     std::vector<rct::key> amount_keys;
-    tx.vin.clear();
-    tx.vout.clear();
-    tx.signatures.clear();
-    tx.rct_signatures.type = rct::RCTTypeNull;
+    tx.set_null();
     amount_keys.clear();
 
     tx.version = rct ? 2 : 1;
@@ -512,7 +509,7 @@ namespace cryptonote
 
           std::string extra_nonce;
           set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, payment_id);
-          remove_extra_nonce_tx_extra(tx.extra);
+          remove_field_from_tx_extra(tx.extra, typeid(tx_extra_fields));
           if (!add_extra_nonce_to_tx_extra(tx.extra, extra_nonce))
           {
             LOG_ERROR("Failed to add encrypted payment id to tx extra");
@@ -615,6 +612,14 @@ namespace cryptonote
       return false;
     }
 
+    // check for watch only wallet
+    bool zero_secret_key = true;
+    for (size_t i = 0; i < sizeof(sender_account_keys.m_spend_secret_key); ++i)
+      zero_secret_key &= (sender_account_keys.m_spend_secret_key.data[i] == 0);
+    if (zero_secret_key)
+    {
+      LOG_PRINT_L1("Null secret key, skipping signatures");
+    }
 
     if (tx.version == 1)
     {
@@ -641,7 +646,8 @@ namespace cryptonote
         tx.signatures.push_back(std::vector<crypto::signature>());
         std::vector<crypto::signature>& sigs = tx.signatures.back();
         sigs.resize(src_entr.outputs.size());
-        crypto::generate_ring_signature(tx_prefix_hash, boost::get<txin_to_key>(tx.vin[i]).k_image, keys_ptrs, in_contexts[i].in_ephemeral.sec, src_entr.real_output, sigs.data());
+        if (!zero_secret_key)
+          crypto::generate_ring_signature(tx_prefix_hash, boost::get<txin_to_key>(tx.vin[i]).k_image, keys_ptrs, in_contexts[i].in_ephemeral.sec, src_entr.real_output, sigs.data());
         ss_ring_s << "signatures:" << ENDL;
         std::for_each(sigs.begin(), sigs.end(), [&](const crypto::signature& s){ss_ring_s << s << ENDL;});
         ss_ring_s << "prefix_hash:" << tx_prefix_hash << ENDL << "in_ephemeral_key: " << in_contexts[i].in_ephemeral.sec << ENDL << "real_output: " << src_entr.real_output;
diff --git a/src/cryptonote_core/cryptonote_format_utils.h b/src/cryptonote_core/cryptonote_format_utils.h
index e6a3bfba4..24db8008e 100644
--- a/src/cryptonote_core/cryptonote_format_utils.h
+++ b/src/cryptonote_core/cryptonote_format_utils.h
@@ -62,6 +62,16 @@ namespace cryptonote
     rct::key mask;                      //ringct amount mask
 
     void push_output(uint64_t idx, const crypto::public_key &k, uint64_t amount) { outputs.push_back(std::make_pair(idx, rct::ctkey({rct::pk2rct(k), rct::zeroCommit(amount)}))); }
+
+    BEGIN_SERIALIZE_OBJECT()
+      FIELD(outputs)
+      VARINT_FIELD(real_output)
+      FIELD(real_out_tx_key)
+      VARINT_FIELD(real_output_in_tx_index)
+      VARINT_FIELD(amount)
+      FIELD(rct)
+      FIELD(mask)
+    END_SERIALIZE()
   };
 
   struct tx_destination_entry
@@ -71,6 +81,11 @@ namespace cryptonote
 
     tx_destination_entry() : amount(0), addr(AUTO_VAL_INIT(addr)) { }
     tx_destination_entry(uint64_t a, const account_public_address &ad) : amount(a), addr(ad) { }
+
+    BEGIN_SERIALIZE_OBJECT()
+      VARINT_FIELD(amount)
+      FIELD(addr)
+    END_SERIALIZE()
   };
 
   //---------------------------------------------------------------
@@ -94,7 +109,7 @@ namespace cryptonote
   crypto::public_key get_tx_pub_key_from_extra(const transaction& tx);
   bool add_tx_pub_key_to_extra(transaction& tx, const crypto::public_key& tx_pub_key);
   bool add_extra_nonce_to_tx_extra(std::vector<uint8_t>& tx_extra, const blobdata& extra_nonce);
-  bool remove_extra_nonce_tx_extra(std::vector<uint8_t>& tx_extra);
+  bool remove_field_from_tx_extra(std::vector<uint8_t>& tx_extra, const std::type_info &type);
   void set_payment_id_to_tx_extra_nonce(blobdata& extra_nonce, const crypto::hash& payment_id);
   void set_encrypted_payment_id_to_tx_extra_nonce(blobdata& extra_nonce, const crypto::hash8& payment_id);
   bool get_payment_id_from_tx_extra_nonce(const blobdata& extra_nonce, crypto::hash& payment_id);
diff --git a/src/serialization/list.h b/src/serialization/list.h
new file mode 100644
index 000000000..d0fb72163
--- /dev/null
+++ b/src/serialization/list.h
@@ -0,0 +1,100 @@
+// Copyright (c) 2014-2015, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#pragma once
+
+#include "serialization.h"
+
+namespace serialization
+{
+  namespace detail
+  {
+    template <typename Archive, class T>
+    bool serialize_list_element(Archive& ar, T& e)
+    {
+      return ::do_serialize(ar, e);
+    }
+
+    template <typename Archive>
+    bool serialize_list_element(Archive& ar, uint64_t& e)
+    {
+      ar.serialize_varint(e);
+      return true;
+    }
+  }
+}
+
+template <template <bool> class Archive, class T>
+bool do_serialize(Archive<false> &ar, std::list<T> &l)
+{
+  size_t cnt;
+  ar.begin_array(cnt);
+  if (!ar.stream().good())
+    return false;
+  l.clear();
+
+  // very basic sanity check
+  if (ar.remaining_bytes() < cnt) {
+    ar.stream().setstate(std::ios::failbit);
+    return false;
+  }
+
+  for (size_t i = 0; i < cnt; i++) {
+    if (i > 0)
+      ar.delimit_array();
+    l.push_back(T());
+    T &t = l.back();
+    if (!::serialization::detail::serialize_list_element(ar, t))
+      return false;
+    if (!ar.stream().good())
+      return false;
+  }
+  ar.end_array();
+  return true;
+}
+
+template <template <bool> class Archive, class T>
+bool do_serialize(Archive<true> &ar, std::list<T> &l)
+{
+  size_t cnt = l.size();
+  ar.begin_array(cnt);
+  for (typename std::list<T>::iterator i = l.begin(); i != l.end(); ++i) {
+    if (!ar.stream().good())
+      return false;
+    if (i != l.begin())
+      ar.delimit_array();
+    if(!::serialization::detail::serialize_list_element(ar, *i))
+      return false;
+    if (!ar.stream().good())
+      return false;
+  }
+  ar.end_array();
+  return true;
+}
diff --git a/src/serialization/pair.h b/src/serialization/pair.h
new file mode 100644
index 000000000..4913a74d6
--- /dev/null
+++ b/src/serialization/pair.h
@@ -0,0 +1,96 @@
+// Copyright (c) 2014-2015, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#pragma once
+#include <memory>
+#include "serialization.h"
+
+namespace serialization
+{
+  namespace detail
+  {
+    template <typename Archive, class T>
+    bool serialize_pair_element(Archive& ar, T& e)
+    {
+      return ::do_serialize(ar, e);
+    }
+
+    template <typename Archive>
+    bool serialize_pair_element(Archive& ar, uint64_t& e)
+    {
+      ar.serialize_varint(e);
+      return true;
+    }
+  }
+}
+
+template <template <bool> class Archive, class F, class S>
+inline bool do_serialize(Archive<false>& ar, std::pair<F,S>& p)
+{
+  size_t cnt;
+  ar.begin_array(cnt);
+  if (!ar.stream().good())
+    return false;
+  if (cnt != 2)
+    return false;
+
+  if (!::serialization::detail::serialize_pair_element(ar, p.first))
+    return false;
+  if (!ar.stream().good())
+    return false;
+  ar.delimit_array();
+  if (!::serialization::detail::serialize_pair_element(ar, p.second))
+    return false;
+  if (!ar.stream().good())
+    return false;
+
+  ar.end_array();
+  return true;
+}
+
+template <template <bool> class Archive, class F, class S>
+inline bool do_serialize(Archive<true>& ar, std::pair<F,S>& p)
+{
+  ar.begin_array(2);
+  if (!ar.stream().good())
+    return false;
+  if(!::serialization::detail::serialize_pair_element(ar, p.first))
+    return false;
+  if (!ar.stream().good())
+    return false;
+  ar.delimit_array();
+  if(!::serialization::detail::serialize_pair_element(ar, p.second))
+    return false;
+  if (!ar.stream().good())
+    return false;
+  ar.end_array();
+  return true;
+}
+
diff --git a/src/serialization/serialization.h b/src/serialization/serialization.h
index 177cdf33a..dac43720b 100644
--- a/src/serialization/serialization.h
+++ b/src/serialization/serialization.h
@@ -41,6 +41,7 @@
 
 #pragma once
 #include <vector>
+#include <list>
 #include <string>
 #include <boost/type_traits/is_integral.hpp>
 #include <boost/type_traits/integral_constant.hpp>
@@ -59,6 +60,16 @@ struct is_blob_type { typedef boost::false_type type; };
 template <class T>
 struct has_free_serializer { typedef boost::true_type type; };
 
+/*! \struct is_pair_type 
+ *
+ * \brief a descriptor for dispatching serialize
+ */
+template <class T>
+struct is_pair_type { typedef boost::false_type type; };
+
+template<typename F, typename S>
+struct is_pair_type<std::pair<F,S>> { typedef boost::true_type type; };
+
 /*! \struct serializer
  *
  * \brief ... wouldn't a class be better?
@@ -75,20 +86,26 @@ struct has_free_serializer { typedef boost::true_type type; };
 template <class Archive, class T>
 struct serializer{
   static bool serialize(Archive &ar, T &v) {
-    return serialize(ar, v, typename boost::is_integral<T>::type(), typename is_blob_type<T>::type());
+    return serialize(ar, v, typename boost::is_integral<T>::type(), typename is_blob_type<T>::type(), typename is_pair_type<T>::type());
   }
-  static bool serialize(Archive &ar, T &v, boost::false_type, boost::true_type) {
+  template<typename A>
+  static bool serialize(Archive &ar, T &v, boost::false_type, boost::true_type, A a) {
     ar.serialize_blob(&v, sizeof(v));
     return true;
   }
-  static bool serialize(Archive &ar, T &v, boost::true_type, boost::false_type) {
+  template<typename A>
+  static bool serialize(Archive &ar, T &v, boost::true_type, boost::false_type, A a) {
     ar.serialize_int(v);
     return true;
   }
-  static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type) {
+  static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::false_type) {
     //serialize_custom(ar, v, typename has_free_serializer<T>::type());
     return v.do_serialize(ar);
   }
+  static bool serialize(Archive &ar, T &v, boost::false_type, boost::false_type, boost::true_type) {
+    //serialize_custom(ar, v, typename has_free_serializer<T>::type());
+    return do_serialize(ar, v);
+  }
   static void serialize_custom(Archive &ar, T &v, boost::true_type) {
   }
 };
@@ -328,3 +345,5 @@ namespace serialization {
 
 #include "string.h"
 #include "vector.h"
+#include "list.h"
+#include "pair.h"
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 279a5fa41..101a6e306 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -389,11 +389,6 @@ bool simple_wallet::seed_set_language(const std::vector<std::string> &args/* = s
 bool simple_wallet::set_always_confirm_transfers(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
 {
   bool success = false;
-  if (m_wallet->watch_only())
-  {
-    fail_msg_writer() << tr("wallet is watch-only and cannot transfer");
-    return true;
-  }
   tools::password_container pwd_container(m_wallet_file.empty());
   success = pwd_container.read_password();
   if (!success)
@@ -654,6 +649,8 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("transfer", boost::bind(&simple_wallet::transfer_new, this, _1), tr("Same as transfer_original, but using a new transaction building algorithm"));
   m_cmd_binder.set_handler("sweep_unmixable", boost::bind(&simple_wallet::sweep_unmixable, this, _1), tr("Send all unmixable outputs to yourself with mixin 0"));
   m_cmd_binder.set_handler("sweep_all", boost::bind(&simple_wallet::sweep_all, this, _1), tr("Send all unlocked balance an address"));
+  m_cmd_binder.set_handler("sign_transfer", boost::bind(&simple_wallet::sign_transfer, this, _1), tr("Sign a transaction from a file"));
+  m_cmd_binder.set_handler("submit_transfer", boost::bind(&simple_wallet::submit_transfer, this, _1), tr("Submit a signed transaction from a file"));
   m_cmd_binder.set_handler("set_log", boost::bind(&simple_wallet::set_log, this, _1), tr("set_log <level> - Change current log detail level, <0-4>"));
   m_cmd_binder.set_handler("address", boost::bind(&simple_wallet::print_address, this, _1), tr("Show current wallet public address"));
   m_cmd_binder.set_handler("integrated_address", boost::bind(&simple_wallet::print_integrated_address, this, _1), tr("integrated_address [PID] - Encode a payment ID into an integrated address for the current wallet public address (no argument uses a random payment ID), or decode an integrated address to standard address and payment ID"));
@@ -2313,12 +2310,6 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
      return true;
   }
 
-  if(m_wallet->watch_only())
-  {
-     fail_msg_writer() << tr("this is a watch only wallet");
-     return true;
-  }
-
   std::vector<uint8_t> extra;
   bool payment_id_seen = false;
   if (1 == local_args.size() % 2)
@@ -2455,7 +2446,19 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
     }
 
     // actually commit the transactions
-    while (!ptx_vector.empty())
+    if (m_wallet->watch_only())
+    {
+      bool r = m_wallet->save_tx(ptx_vector, "unsigned_monero_tx");
+      if (!r)
+      {
+        fail_msg_writer() << tr("Failed to write transaction(s) to file");
+      }
+      else
+      {
+        success_msg_writer(true) << tr("Unsigned transaction(s) successfully written to file: ") << "unsigned_monero_tx";
+      }
+    }
+    else while (!ptx_vector.empty())
     {
       auto & ptx = ptx_vector.back();
       m_wallet->commit_tx(ptx);
@@ -2562,12 +2565,6 @@ bool simple_wallet::sweep_unmixable(const std::vector<std::string> &args_)
   if (!try_connect_to_daemon())
     return true;
 
-  if(m_wallet->watch_only())
-  {
-     fail_msg_writer() << tr("this is a watch only wallet");
-     return true;
-  }
-
   LOCK_IDLE_SCOPE();
   try
   {
@@ -2617,7 +2614,19 @@ bool simple_wallet::sweep_unmixable(const std::vector<std::string> &args_)
     }
 
     // actually commit the transactions
-    while (!ptx_vector.empty())
+    if (m_wallet->watch_only())
+    {
+      bool r = m_wallet->save_tx(ptx_vector, "unsigned_monero_tx");
+      if (!r)
+      {
+        fail_msg_writer() << tr("Failed to write transaction(s) to file");
+      }
+      else
+      {
+        success_msg_writer(true) << tr("Unsigned transaction(s) successfully written to file: ") << "unsigned_monero_tx";
+      }
+    }
+    else while (!ptx_vector.empty())
     {
       auto & ptx = ptx_vector.back();
       m_wallet->commit_tx(ptx);
@@ -2714,12 +2723,6 @@ bool simple_wallet::sweep_all(const std::vector<std::string> &args_)
   if (!try_connect_to_daemon())
     return true;
 
-  if(m_wallet->watch_only())
-  {
-     fail_msg_writer() << tr("this is a watch only wallet");
-     return true;
-  }
-
   std::vector<std::string> local_args = args_;
 
   size_t fake_outs_count;
@@ -2849,7 +2852,19 @@ bool simple_wallet::sweep_all(const std::vector<std::string> &args_)
     }
 
     // actually commit the transactions
-    while (!ptx_vector.empty())
+    if (m_wallet->watch_only())
+    {
+      bool r = m_wallet->save_tx(ptx_vector, "unsigned_monero_tx");
+      if (!r)
+      {
+        fail_msg_writer() << tr("Failed to write transaction(s) to file");
+      }
+      else
+      {
+        success_msg_writer(true) << tr("Unsigned transaction(s) successfully written to file: ") << "unsigned_monero_tx";
+      }
+    }
+    else while (!ptx_vector.empty())
     {
       auto & ptx = ptx_vector.back();
       m_wallet->commit_tx(ptx);
@@ -2941,6 +2956,235 @@ bool simple_wallet::sweep_all(const std::vector<std::string> &args_)
   return true;
 }
 //----------------------------------------------------------------------------------------------------
+bool simple_wallet::accept_loaded_tx(const tools::wallet2::unsigned_tx_set &txs)
+{
+  // gather info to ask the user
+  uint64_t amount = 0, amount_to_dests = 0, change = 0;
+  size_t min_mixin = ~0;
+  std::unordered_map<std::string, uint64_t> dests;
+  const std::string wallet_address = m_wallet->get_account().get_public_address_str(m_wallet->testnet());
+  for (size_t n = 0; n < txs.txes.size(); ++n)
+  {
+    const tools::wallet2::tx_construction_data &cd = txs.txes[n];
+    for (size_t s = 0; s < cd.sources.size(); ++s)
+    {
+      amount += cd.sources[s].amount;
+      size_t mixin = cd.sources[s].outputs.size() - 1;
+      if (mixin < min_mixin)
+        min_mixin = mixin;
+    }
+    for (size_t d = 0; d < cd.destinations.size(); ++d)
+    {
+      const tx_destination_entry &entry = cd.destinations[d];
+      std::string address = get_account_address_as_str(m_wallet->testnet(), entry.addr);
+      std::unordered_map<std::string,uint64_t>::iterator i = dests.find(address);
+      if (i == dests.end())
+        dests.insert(std::make_pair(address, entry.amount));
+      else
+        i->second += entry.amount;
+      amount_to_dests += entry.amount;
+    }
+    if (cd.change_dts.amount > 0)
+    {
+      dests.insert(std::make_pair(get_account_address_as_str(m_wallet->testnet(), cd.change_dts.addr), cd.change_dts.amount));
+      amount_to_dests += cd.change_dts.amount;
+      change += cd.change_dts.amount;
+    }
+  }
+  std::string dest_string;
+  for (std::unordered_map<std::string, uint64_t>::const_iterator i = dests.begin(); i != dests.end(); )
+  {
+    dest_string += (boost::format(tr("sending %s to %s")) % print_money(i->second) % i->first).str();
+    ++i;
+    if (i != dests.end())
+      dest_string += ", ";
+  }
+  if (dest_string.empty())
+    dest_string = tr("with no destinations");
+
+  uint64_t fee = amount - amount_to_dests;
+  std::string prompt_str = (boost::format(tr("Loaded %lu transactions, for %s, fee %s, change %s, %s, with min mixin %lu (full details in log file). Is this okay? (Y/Yes/N/No)")) % (unsigned long)txs.txes.size() % print_money(amount) % print_money(fee) % print_money(change) % dest_string % (unsigned long)min_mixin).str();
+  std::string accepted = command_line::input_line(prompt_str);
+  return is_it_true(accepted);
+}
+//----------------------------------------------------------------------------------------------------
+bool simple_wallet::sign_transfer(const std::vector<std::string> &args_)
+{
+  if(m_wallet->watch_only())
+  {
+     fail_msg_writer() << tr("This is a watch only wallet");
+     return true;
+  }
+
+  try
+  {
+    bool r = m_wallet->sign_tx("unsigned_monero_tx", "signed_monero_tx", [&](const tools::wallet2::unsigned_tx_set &tx){ return accept_loaded_tx(tx); });
+    if (!r)
+    {
+      fail_msg_writer() << tr("Failed to sign transaction");
+      return true;
+    }
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Failed to sign transaction: ") << e.what();
+    return true;
+  }
+
+  success_msg_writer(true) << tr("Transaction successfully signed to file: ") << "signed_monero_tx";
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
+bool simple_wallet::submit_transfer(const std::vector<std::string> &args_)
+{
+  if (!try_connect_to_daemon())
+    return true;
+
+  try
+  {
+    std::vector<tools::wallet2::pending_tx> ptx_vector;
+    bool r = m_wallet->load_tx("signed_monero_tx", ptx_vector);
+    if (!r)
+    {
+      fail_msg_writer() << tr("Failed to load transaction from file");
+      return true;
+    }
+
+    // if more than one tx necessary, prompt user to confirm
+    if (m_wallet->always_confirm_transfers())
+    {
+        uint64_t total_fee = 0;
+        uint64_t dust_not_in_fee = 0;
+        uint64_t dust_in_fee = 0;
+        for (size_t n = 0; n < ptx_vector.size(); ++n)
+        {
+          total_fee += ptx_vector[n].fee;
+
+          if (ptx_vector[n].dust_added_to_fee)
+            dust_in_fee += ptx_vector[n].dust;
+          else
+            dust_not_in_fee += ptx_vector[n].dust;
+        }
+
+        std::stringstream prompt;
+        if (ptx_vector.size() > 1)
+        {
+          prompt << boost::format(tr("Your transaction needs to be split into %llu transactions.  "
+            "This will result in a transaction fee being applied to each transaction, for a total fee of %s")) %
+            ((unsigned long long)ptx_vector.size()) % print_money(total_fee);
+        }
+        else
+        {
+          prompt << boost::format(tr("The transaction fee is %s")) %
+            print_money(total_fee);
+        }
+        if (dust_in_fee != 0) prompt << boost::format(tr(", of which %s is dust from change")) % print_money(dust_in_fee);
+        if (dust_not_in_fee != 0)  prompt << tr(".") << ENDL << boost::format(tr("A total of %s from dust change will be sent to dust address"))
+                                                   % print_money(dust_not_in_fee);
+        prompt << tr(".") << ENDL << tr("Is this okay?  (Y/Yes/N/No)");
+
+        std::string accepted = command_line::input_line(prompt.str());
+        if (std::cin.eof())
+          return true;
+        if (accepted != "Y" && accepted != "y" && accepted != "Yes" && accepted != "yes")
+        {
+          fail_msg_writer() << tr("transaction cancelled.");
+
+          // would like to return false, because no tx made, but everything else returns true
+          // and I don't know what returning false might adversely affect.  *sigh*
+          return true;
+        }
+    }
+
+    // actually commit the transactions
+    while (!ptx_vector.empty())
+    {
+      auto & ptx = ptx_vector.back();
+      m_wallet->commit_tx(ptx);
+      success_msg_writer(true) << tr("Money successfully sent, transaction: ") << get_transaction_hash(ptx.tx);
+
+      // if no exception, remove element from vector
+      ptx_vector.pop_back();
+    }
+  }
+  catch (const tools::error::daemon_busy&)
+  {
+    fail_msg_writer() << tr("daemon is busy. Please try later");
+  }
+  catch (const tools::error::no_connection_to_daemon&)
+  {
+    fail_msg_writer() << tr("no connection to daemon. Please, make sure daemon is running.");
+  }
+  catch (const tools::error::wallet_rpc_error& e)
+  {
+    LOG_ERROR("Unknown RPC error: " << e.to_string());
+    fail_msg_writer() << tr("RPC error: ") << e.what();
+  }
+  catch (const tools::error::get_random_outs_error&)
+  {
+    fail_msg_writer() << tr("failed to get random outputs to mix");
+  }
+  catch (const tools::error::not_enough_money& e)
+  {
+    fail_msg_writer() << boost::format(tr("not enough money to transfer, available only %s, transaction amount %s = %s + %s (fee)")) %
+      print_money(e.available()) %
+      print_money(e.tx_amount() + e.fee()) %
+      print_money(e.tx_amount()) %
+      print_money(e.fee());
+  }
+  catch (const tools::error::not_enough_outs_to_mix& e)
+  {
+    auto writer = fail_msg_writer();
+    writer << tr("not enough outputs for specified mixin_count") << " = " << e.mixin_count() << ":";
+    for (std::pair<uint64_t, uint64_t> outs_for_amount : e.scanty_outs())
+    {
+      writer << "\n" << tr("output amount") << " = " << print_money(outs_for_amount.first) << ", " << tr("found outputs to mix") << " = " << outs_for_amount.second;
+    }
+  }
+  catch (const tools::error::tx_not_constructed&)
+  {
+    fail_msg_writer() << tr("transaction was not constructed");
+  }
+  catch (const tools::error::tx_rejected& e)
+  {
+    fail_msg_writer() << (boost::format(tr("transaction %s was rejected by daemon with status: ")) % get_transaction_hash(e.tx())) << e.status();
+  }
+  catch (const tools::error::tx_sum_overflow& e)
+  {
+    fail_msg_writer() << e.what();
+  }
+  catch (const tools::error::zero_destination&)
+  {
+    fail_msg_writer() << tr("one of destinations is zero");
+  }
+  catch (const tools::error::tx_too_big& e)
+  {
+    fail_msg_writer() << tr("Failed to find a suitable way to split transactions");
+  }
+  catch (const tools::error::transfer_error& e)
+  {
+    LOG_ERROR("unknown transfer error: " << e.to_string());
+    fail_msg_writer() << tr("unknown transfer error: ") << e.what();
+  }
+  catch (const tools::error::wallet_internal_error& e)
+  {
+    LOG_ERROR("internal error: " << e.to_string());
+    fail_msg_writer() << tr("internal error: ") << e.what();
+  }
+  catch (const std::exception& e)
+  {
+    LOG_ERROR("unexpected error: " << e.what());
+    fail_msg_writer() << tr("unexpected error: ") << e.what();
+  }
+  catch (...)
+  {
+    LOG_ERROR("Unknown error");
+    fail_msg_writer() << tr("unknown error");
+  }
+
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
 bool simple_wallet::get_tx_key(const std::vector<std::string> &args_)
 {
   std::vector<std::string> local_args = args_;
diff --git a/src/simplewallet/simplewallet.h b/src/simplewallet/simplewallet.h
index 6eb18ed9a..61e956ce9 100644
--- a/src/simplewallet/simplewallet.h
+++ b/src/simplewallet/simplewallet.h
@@ -125,6 +125,8 @@ namespace cryptonote
     bool transfer_new(const std::vector<std::string> &args);
     bool sweep_all(const std::vector<std::string> &args);
     bool sweep_unmixable(const std::vector<std::string> &args);
+    bool sign_transfer(const std::vector<std::string> &args);
+    bool submit_transfer(const std::vector<std::string> &args);
     std::vector<std::vector<cryptonote::tx_destination_entry>> split_amounts(
         std::vector<cryptonote::tx_destination_entry> dsts, size_t num_splits
     );
@@ -152,6 +154,7 @@ namespace cryptonote
     uint64_t get_daemon_blockchain_height(std::string& err);
     bool try_connect_to_daemon(bool silent = false);
     bool ask_wallet_create_if_needed();
+    bool accept_loaded_tx(const tools::wallet2::unsigned_tx_set &txs);
     bool get_address_from_str(const std::string &str, cryptonote::account_public_address &address, bool &has_payment_id, crypto::hash8 &payment_id);
 
     /*!
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index ed4ab93de..2cbee4812 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -74,6 +74,9 @@ using namespace cryptonote;
 // arbitrary, used to generate different hashes from the same input
 #define CHACHA8_KEY_TAIL 0x8c
 
+#define UNSIGNED_TX_PREFIX "Monero unsigned tx set\001"
+#define SIGNED_TX_PREFIX "Monero signed tx set\001"
+
 #define KILL_IOSERVICE()  \
     do { \
       work.reset(); \
@@ -173,15 +176,17 @@ bool wallet2::is_deprecated() const
   return is_old_file_format;
 }
 //----------------------------------------------------------------------------------------------------
-void wallet2::set_spent(transfer_details &td, uint64_t height)
+void wallet2::set_spent(size_t idx, uint64_t height)
 {
+  transfer_details &td = m_transfers[idx];
   LOG_PRINT_L2("Setting SPENT at " << height << ": ki " << td.m_key_image << ", amount " << print_money(td.m_amount));
   td.m_spent = true;
   td.m_spent_height = height;
 }
 //----------------------------------------------------------------------------------------------------
-void wallet2::set_unspent(transfer_details &td)
+void wallet2::set_unspent(size_t idx)
 {
+  transfer_details &td = m_transfers[idx];
   LOG_PRINT_L2("Setting UNSPENT: ki " << td.m_key_image << ", amount " << print_money(td.m_amount));
   td.m_spent = false;
   td.m_spent_height = 0;
@@ -501,7 +506,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
               td.m_mask = rct::identity();
               td.m_rct = false;
             }
-	    set_unspent(td);
+	    set_unspent(m_transfers.size()-1);
 	    m_key_images[td.m_key_image] = m_transfers.size()-1;
 	    LOG_PRINT_L0("Received money: " << print_money(td.amount()) << ", with tx: " << txid());
 	    if (0 != m_callback)
@@ -580,7 +585,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, const s
       amount = td.amount();
       LOG_PRINT_L0("Spent money: " << print_money(amount) << ", with tx: " << txid());
       tx_money_spent_in_ins += amount;
-      set_spent(td, height);
+      set_spent(it->second, height);
       if (0 != m_callback)
         m_callback->on_money_spent(height, tx, amount, tx);
     }
@@ -997,12 +1002,13 @@ void wallet2::update_pool_state()
           if (pit->second.m_tx.vin[vini].type() == typeid(txin_to_key))
           {
             txin_to_key &tx_in_to_key = boost::get<txin_to_key>(pit->second.m_tx.vin[vini]);
-            for (auto &td: m_transfers)
+            for (size_t i = 0; i < m_transfers.size(); ++i)
             {
+              const transfer_details &td = m_transfers[i];
               if (td.m_key_image == tx_in_to_key.k_image)
               {
                  LOG_PRINT_L1("Resetting spent status for output " << vini << ": " << td.m_key_image);
-                 set_unspent(td);
+                 set_unspent(i);
                  break;
               }
             }
@@ -1301,7 +1307,7 @@ void wallet2::detach_blockchain(uint64_t height)
     if (td.m_spent && td.m_spent_height >= height)
     {
       LOG_PRINT_L1("Resetting spent status for output " << i << ": " << td.m_key_image);
-      set_unspent(td);
+      set_unspent(i);
     }
   }
 
@@ -1590,7 +1596,8 @@ bool wallet2::verify_password(const std::string& password) const
   const cryptonote::account_keys& keys = account_data_check.get_keys();
 
   r = r && verify_keys(keys.m_view_secret_key,  keys.m_account_address.m_view_public_key);
-  r = r && verify_keys(keys.m_spend_secret_key, keys.m_account_address.m_spend_public_key);
+  if(!m_watch_only)
+    r = r && verify_keys(keys.m_spend_secret_key, keys.m_account_address.m_spend_public_key);
   return r;
 }
 
@@ -2128,13 +2135,13 @@ void wallet2::rescan_spent()
       if (td.m_spent)
       {
         LOG_PRINT_L0("Marking output " << i << "(" << td.m_key_image << ") as unspent, it was marked as spent");
-        set_unspent(td);
+        set_unspent(i);
         td.m_spent_height = 0;
       }
       else
       {
         LOG_PRINT_L0("Marking output " << i << "(" << td.m_key_image << ") as spent, it was marked as unspent");
-        set_spent(td, td.m_spent_height);
+        set_spent(i, td.m_spent_height);
         // unknown height, if this gets reorged, it might still be missed
       }
     }
@@ -2260,7 +2267,7 @@ float wallet2::get_output_relatedness(const transfer_details &td0, const transfe
   return 0.0f;
 }
 //----------------------------------------------------------------------------------------------------
-size_t wallet2::pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_indices, const std::list<transfer_container::iterator>& selected_transfers) const
+size_t wallet2::pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_indices, const std::list<size_t>& selected_transfers) const
 {
   std::vector<size_t> candidates;
   float best_relatedness = 1.0f;
@@ -2268,9 +2275,9 @@ size_t wallet2::pop_best_value_from(const transfer_container &transfers, std::ve
   {
     const transfer_details &candidate = transfers[unused_indices[n]];
     float relatedness = 0.0f;
-    for (const auto &i: selected_transfers)
+    for (size_t i = 0; i < selected_transfers.size(); ++i)
     {
-      float r = get_output_relatedness(candidate, *i);
+      float r = get_output_relatedness(candidate, transfers[i]);
       if (r > relatedness)
       {
         relatedness = r;
@@ -2292,7 +2299,7 @@ size_t wallet2::pop_best_value_from(const transfer_container &transfers, std::ve
   return pop_index (unused_indices, candidates[idx]);
 }
 //----------------------------------------------------------------------------------------------------
-size_t wallet2::pop_best_value(std::vector<size_t> &unused_indices, const std::list<transfer_container::iterator>& selected_transfers) const
+size_t wallet2::pop_best_value(std::vector<size_t> &unused_indices, const std::list<size_t>& selected_transfers) const
 {
   return pop_best_value_from(m_transfers, unused_indices, selected_transfers);
 }
@@ -2301,7 +2308,7 @@ size_t wallet2::pop_best_value(std::vector<size_t> &unused_indices, const std::l
 // returns:
 //    direct return: amount of money found
 //    modified reference: selected_transfers, a list of iterators/indices of input sources
-uint64_t wallet2::select_transfers(uint64_t needed_money, std::vector<size_t> unused_transfers_indices, std::list<transfer_container::iterator>& selected_transfers, bool trusted_daemon)
+uint64_t wallet2::select_transfers(uint64_t needed_money, std::vector<size_t> unused_transfers_indices, std::list<size_t>& selected_transfers, bool trusted_daemon)
 {
   uint64_t found_money = 0;
   while (found_money < needed_money && !unused_transfers_indices.empty())
@@ -2309,7 +2316,7 @@ uint64_t wallet2::select_transfers(uint64_t needed_money, std::vector<size_t> un
     size_t idx = pop_best_value(unused_transfers_indices, selected_transfers);
 
     transfer_container::iterator it = m_transfers.begin() + idx;
-    selected_transfers.push_back(it);
+    selected_transfers.push_back(idx);
     found_money += it->amount();
   }
 
@@ -2513,8 +2520,8 @@ void wallet2::commit_tx(pending_tx& ptx)
   {
     payment_id = get_payment_id(ptx);
     dests = ptx.dests;
-    BOOST_FOREACH(transfer_container::iterator it, ptx.selected_transfers)
-      amount_in += it->amount();
+    BOOST_FOREACH(size_t idx, ptx.selected_transfers)
+      amount_in += m_transfers[idx].amount();
   }
   add_unconfirmed_tx(ptx.tx, amount_in, dests, payment_id, ptx.change_dts.amount);
   if (store_tx_info())
@@ -2524,9 +2531,9 @@ void wallet2::commit_tx(pending_tx& ptx)
 
   LOG_PRINT_L2("transaction " << txid << " generated ok and sent to daemon, key_images: [" << ptx.key_images << "]");
 
-  BOOST_FOREACH(transfer_container::iterator it, ptx.selected_transfers)
+  BOOST_FOREACH(size_t idx, ptx.selected_transfers)
   {
-    set_spent(*it, 0);
+    set_spent(idx, 0);
   }
 
   //fee includes dust if dust policy specified it.
@@ -2544,7 +2551,153 @@ void wallet2::commit_tx(std::vector<pending_tx>& ptx_vector)
     commit_tx(ptx);
   }
 }
+//----------------------------------------------------------------------------------------------------
+bool wallet2::save_tx(const std::vector<pending_tx>& ptx_vector, const std::string &filename)
+{
+  LOG_PRINT_L0("saving " << ptx_vector.size() << " transactions");
+  unsigned_tx_set txs;
+  for (auto &tx: ptx_vector)
+    txs.txes.push_back(tx.construction_data);
+  std::string s = obj_to_json_str(txs);
+  if (s.empty())
+    return false;
+  LOG_PRINT_L2("Saving unsigned tx data: " << s);
+  // save as binary as there's no implementation of loading a json_archive
+  if (!::serialization::dump_binary(txs, s))
+    return false;
+  return epee::file_io_utils::save_string_to_file(filename, std::string(UNSIGNED_TX_PREFIX) + s);
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::sign_tx(const std::string &unsigned_filename, const std::string &signed_filename, std::function<bool(const unsigned_tx_set&)> accept_func)
+{
+  std::string s;
+  boost::system::error_code errcode;
+
+  if (!boost::filesystem::exists(unsigned_filename, errcode))
+  {
+    LOG_PRINT_L0("File " << unsigned_filename << " does not exist: " << errcode);
+    return false;
+  }
+  if (!epee::file_io_utils::load_file_to_string(unsigned_filename.c_str(), s))
+  {
+    LOG_PRINT_L0("Failed to load from " << unsigned_filename);
+    return false;
+  }
+  const size_t magiclen = strlen(UNSIGNED_TX_PREFIX);
+  if (strncmp(s.c_str(), UNSIGNED_TX_PREFIX, magiclen))
+  {
+    LOG_PRINT_L0("Bad magic from " << unsigned_filename);
+    return false;
+  }
+  unsigned_tx_set exported_txs;
+  if (!::serialization::parse_binary(std::string(s.c_str() + magiclen, s.size() - magiclen), exported_txs))
+  {
+    LOG_PRINT_L0("Failed to parse data from " << unsigned_filename);
+    return false;
+  }
+  LOG_PRINT_L1("Loaded tx unsigned data from binary: " << exported_txs.txes.size() << " transactions");
+
+  if (accept_func && !accept_func(exported_txs))
+  {
+    LOG_PRINT_L1("Transactions rejected by callback");
+    return false;
+  }
+
+  // sign the transactions
+  signed_tx_set signed_txes;
+  for (size_t n = 0; n < exported_txs.txes.size(); ++n)
+  {
+    const tools::wallet2::tx_construction_data &sd = exported_txs.txes[n];
+    LOG_PRINT_L1(" " << (n+1) << ": " << sd.sources.size() << " inputs, mixin " << (sd.sources[0].outputs.size()-1));
+    signed_txes.ptx.push_back(pending_tx());
+    tools::wallet2::pending_tx &ptx = signed_txes.ptx.back();
+    crypto::secret_key tx_key;
+    std::vector<cryptonote::tx_destination_entry> dests = sd.destinations;
+    if (sd.change_dts.amount > 0)
+      dests.push_back(sd.change_dts);
+    bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), sd.sources, dests, sd.extra, ptx.tx, sd.unlock_time, tx_key, sd.use_rct);
+    THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sd.sources, sd.destinations, sd.unlock_time, m_testnet);
+    // we don't test tx size, because we don't know the current limit, due to not having a blockchain,
+    // and it's a bit pointless to fail there anyway, since it'd be a (good) guess only. We sign anyway,
+    // and if we really go over limit, the daemon will reject when it gets submitted. Chances are it's
+    // OK anyway since it was generated in the first place, and rerolling should be within a few bytes.
+
+    // normally, the tx keys are saved in commit_tx, when the tx is actually sent to the daemon.
+    // we can't do that here since the tx will be sent from the compromised wallet, which we don't want
+    // to see that info, so we save it here
+    if (store_tx_info())
+    {
+      const crypto::hash txid = get_transaction_hash(ptx.tx);
+      m_tx_keys.insert(std::make_pair(txid, tx_key));
+    }
+
+    std::string key_images;
+    bool all_are_txin_to_key = std::all_of(ptx.tx.vin.begin(), ptx.tx.vin.end(), [&](const txin_v& s_e) -> bool
+    {
+      CHECKED_GET_SPECIFIC_VARIANT(s_e, const txin_to_key, in, false);
+      key_images += boost::to_string(in.k_image) + " ";
+      return true;
+    });
+    THROW_WALLET_EXCEPTION_IF(!all_are_txin_to_key, error::unexpected_txin_type, ptx.tx);
+
+    ptx.key_images = key_images;
+    ptx.fee = 0;
+    for (const auto &i: sd.sources) ptx.fee += i.amount;
+    for (const auto &i: dests) ptx.fee -= i.amount;
+    ptx.dust = 0;
+    ptx.dust_added_to_fee = false;
+    ptx.change_dts = sd.change_dts;
+//    ptx.selected_transfers = selected_transfers;
+    ptx.tx_key = rct::rct2sk(rct::identity()); // don't send it back to the untrusted view wallet
+    ptx.dests = sd.destinations;
+    ptx.construction_data = sd;
+  }
+
+  s = obj_to_json_str(signed_txes);
+  if (s.empty())
+    return false;
+  LOG_PRINT_L2("Saving signed tx data: " << s);
+  // save as binary as there's no implementation of loading a json_archive
+  if (!::serialization::dump_binary(signed_txes, s))
+    return false;
+  return epee::file_io_utils::save_string_to_file(signed_filename, std::string(SIGNED_TX_PREFIX) + s);
+}
+//----------------------------------------------------------------------------------------------------
+bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wallet2::pending_tx> &ptx)
+{
+  std::string s;
+  boost::system::error_code errcode;
+  signed_tx_set signed_txs;
+
+  if (!boost::filesystem::exists(signed_filename, errcode))
+  {
+    LOG_PRINT_L0("File " << signed_filename << " does not exist: " << errcode);
+    return false;
+  }
+
+  if (!epee::file_io_utils::load_file_to_string(signed_filename.c_str(), s))
+  {
+    LOG_PRINT_L0("Failed to load from " << signed_filename);
+    return false;
+  }
+  const size_t magiclen = strlen(SIGNED_TX_PREFIX);
+  if (strncmp(s.c_str(), SIGNED_TX_PREFIX, magiclen))
+  {
+    LOG_PRINT_L0("Bad magic from " << signed_filename);
+    return false;
+  }
+  if (!::serialization::parse_binary(std::string(s.c_str() + magiclen, s.size() - magiclen), signed_txs))
+  {
+    LOG_PRINT_L0("Failed to parse data from " << signed_filename);
+    return false;
+  }
+  LOG_PRINT_L1("Loaded signed tx data from binary: " << signed_txs.ptx.size() << " transactions");
 
+  ptx = signed_txs.ptx;
+
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
 uint64_t wallet2::get_fee_multiplier(uint32_t priority, bool use_new_fee) const
 {
   static const uint64_t old_multipliers[3] = {1, 2, 3};
@@ -2563,7 +2716,6 @@ uint64_t wallet2::get_fee_multiplier(uint32_t priority, bool use_new_fee) const
   THROW_WALLET_EXCEPTION_IF (false, error::invalid_priority);
   return 1;
 }
-
 //----------------------------------------------------------------------------------------------------
 // separated the call(s) to wallet2::transfer into their own function
 //
@@ -2613,9 +2765,9 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions(std::vector<crypto
         ptx_vector.push_back(ptx);
 
         // mark transfers to be used as "spent"
-        BOOST_FOREACH(transfer_container::iterator it, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx, ptx.selected_transfers)
         {
-          set_spent(*it, 0);
+          set_spent(idx, 0);
         }
       }
 
@@ -2625,9 +2777,9 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions(std::vector<crypto
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
 
       }
@@ -2644,9 +2796,9 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions(std::vector<crypto
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
       }
 
@@ -2663,9 +2815,9 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions(std::vector<crypto
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
       }
 
@@ -2675,7 +2827,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions(std::vector<crypto
 }
 
 template<typename entry>
-void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<transfer_container::iterator> &selected_transfers, size_t fake_outputs_count)
+void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<size_t> &selected_transfers, size_t fake_outputs_count)
 {
   LOG_PRINT_L2("fake_outputs_count: " << fake_outputs_count);
   outs.clear();
@@ -2688,8 +2840,8 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
     req_t.jsonrpc = "2.0";
     req_t.id = epee::serialization::storage_entry(0);
     req_t.method = "get_output_histogram";
-    for(auto it: selected_transfers)
-      req_t.params.amounts.push_back(it->is_rct() ? 0 : it->amount());
+    for(size_t idx: selected_transfers)
+      req_t.params.amounts.push_back(m_transfers[idx].is_rct() ? 0 : m_transfers[idx].amount());
     std::sort(req_t.params.amounts.begin(), req_t.params.amounts.end());
     auto end = std::unique(req_t.params.amounts.begin(), req_t.params.amounts.end());
     req_t.params.amounts.resize(std::distance(req_t.params.amounts.begin(), end));
@@ -2708,12 +2860,13 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
     COMMAND_RPC_GET_OUTPUTS::request req = AUTO_VAL_INIT(req);
     COMMAND_RPC_GET_OUTPUTS::response daemon_resp = AUTO_VAL_INIT(daemon_resp);
 
-    for(transfer_container::iterator it: selected_transfers)
+    for(size_t idx: selected_transfers)
     {
-      const uint64_t amount = it->is_rct() ? 0 : it->amount();
+      const transfer_details &td = m_transfers[idx];
+      const uint64_t amount = td.is_rct() ? 0 : td.amount();
       std::unordered_set<uint64_t> seen_indices;
       // request more for rct in base recent (locked) coinbases are picked, since they're locked for longer
-      size_t requested_outputs_count = base_requested_outputs_count + (it->is_rct() ? CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW - CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE : 0);
+      size_t requested_outputs_count = base_requested_outputs_count + (td.is_rct() ? CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW - CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE : 0);
       size_t start = req.outputs.size();
 
       // if there are just enough outputs to mix with, use all of them.
@@ -2745,8 +2898,8 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
       {
         // start with real one
         uint64_t num_found = 1;
-        seen_indices.emplace(it->m_global_output_index);
-        req.outputs.push_back({amount, it->m_global_output_index});
+        seen_indices.emplace(td.m_global_output_index);
+        req.outputs.push_back({amount, td.m_global_output_index});
 
         // while we still need more mixins
         while (num_found < requested_outputs_count)
@@ -2798,15 +2951,16 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
     std::unordered_map<uint64_t, uint64_t> scanty_outs;
     size_t base = 0;
     outs.reserve(selected_transfers.size());
-    for(transfer_container::iterator it: selected_transfers)
+    for(size_t idx: selected_transfers)
     {
-      size_t requested_outputs_count = base_requested_outputs_count + (it->is_rct() ? CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW - CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE : 0);
+      const transfer_details &td = m_transfers[idx];
+      size_t requested_outputs_count = base_requested_outputs_count + (td.is_rct() ? CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW - CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE : 0);
       outs.push_back(std::vector<entry>());
       outs.back().reserve(fake_outputs_count + 1);
-      const rct::key mask = it->is_rct() ? rct::commit(it->amount(), it->m_mask) : rct::zeroCommit(it->amount());
+      const rct::key mask = td.is_rct() ? rct::commit(td.amount(), td.m_mask) : rct::zeroCommit(td.amount());
 
       // pick real out first (it will be sorted when done)
-      outs.back().push_back(std::make_tuple(it->m_global_output_index, boost::get<txout_to_key>(it->m_tx.vout[it->m_internal_output_index].target).key, mask));
+      outs.back().push_back(std::make_tuple(td.m_global_output_index, boost::get<txout_to_key>(td.m_tx.vout[td.m_internal_output_index].target).key, mask));
 
       // then pick others in random order till we reach the required number
       // since we use an equiprobable pick here, we don't upset the triangular distribution
@@ -2816,12 +2970,12 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
         order[n] = n;
       std::shuffle(order.begin(), order.end(), std::default_random_engine(crypto::rand<unsigned>()));
 
-      LOG_PRINT_L2("Looking for " << (fake_outputs_count+1) << " outputs of size " << print_money(it->is_rct() ? 0 : it->amount()));
+      LOG_PRINT_L2("Looking for " << (fake_outputs_count+1) << " outputs of size " << print_money(td.is_rct() ? 0 : td.amount()));
       for (size_t o = 0; o < requested_outputs_count && outs.back().size() < fake_outputs_count + 1; ++o)
       {
         size_t i = base + order[o];
-        LOG_PRINT_L2("Index " << i << "/" << requested_outputs_count << ": idx " << req.outputs[i].index << " (real " << it->m_global_output_index << "), unlocked " << daemon_resp.outs[i].unlocked << ", key " << daemon_resp.outs[i].key);
-        if (req.outputs[i].index == it->m_global_output_index) // don't re-add real one
+        LOG_PRINT_L2("Index " << i << "/" << requested_outputs_count << ": idx " << req.outputs[i].index << " (real " << td.m_global_output_index << "), unlocked " << daemon_resp.outs[i].unlocked << ", key " << daemon_resp.outs[i].key);
+        if (req.outputs[i].index == td.m_global_output_index) // don't re-add real one
           continue;
         if (!daemon_resp.outs[i].unlocked) // don't add locked outs
           continue;
@@ -2832,7 +2986,7 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
       }
       if (outs.back().size() < fake_outputs_count + 1)
       {
-        scanty_outs[it->is_rct() ? 0 : it->amount()] = outs.back().size();
+        scanty_outs[td.is_rct() ? 0 : td.amount()] = outs.back().size();
       }
       else
       {
@@ -2845,18 +2999,19 @@ void wallet2::get_outs(std::vector<std::vector<entry>> &outs, const std::list<tr
   }
   else
   {
-    for (transfer_container::iterator it: selected_transfers)
+    for (size_t idx: selected_transfers)
     {
+      const transfer_details &td = m_transfers[idx];
       std::vector<entry> v;
-      const rct::key mask = it->is_rct() ? rct::commit(it->amount(), it->m_mask) : rct::zeroCommit(it->amount());
-      v.push_back(std::make_tuple(it->m_global_output_index, boost::get<txout_to_key>(it->m_tx.vout[it->m_internal_output_index].target).key, mask));
+      const rct::key mask = td.is_rct() ? rct::commit(td.amount(), td.m_mask) : rct::zeroCommit(td.amount());
+      v.push_back(std::make_tuple(td.m_global_output_index, boost::get<txout_to_key>(td.m_tx.vout[td.m_internal_output_index].target).key, mask));
       outs.push_back(v);
     }
   }
 }
 
 template<typename T>
-void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_entry>& dsts, const std::list<transfer_container::iterator> selected_transfers, size_t fake_outputs_count,
+void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_entry>& dsts, const std::list<size_t> selected_transfers, size_t fake_outputs_count,
   uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction& tx, pending_tx &ptx)
 {
   using namespace cryptonote;
@@ -2878,9 +3033,9 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
   }
 
   uint64_t found_money = 0;
-  BOOST_FOREACH(auto it, selected_transfers)
+  BOOST_FOREACH(size_t idx, selected_transfers)
   {
-    found_money += it->amount();
+    found_money += m_transfers[idx].amount();
   }
 
   LOG_PRINT_L2("wanted " << print_money(needed_money) << ", found " << print_money(found_money) << ", fee " << print_money(fee));
@@ -2894,11 +3049,11 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
   typedef cryptonote::tx_source_entry::output_entry tx_output_entry;
   size_t i = 0, out_index = 0;
   std::vector<cryptonote::tx_source_entry> sources;
-  BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
+  BOOST_FOREACH(size_t idx, selected_transfers)
   {
     sources.resize(sources.size()+1);
     cryptonote::tx_source_entry& src = sources.back();
-    transfer_details& td = *it;
+    const transfer_details& td = m_transfers[idx];
     src.amount = td.amount();
     src.rct = td.is_rct();
     //paste keys (fake and real)
@@ -2983,9 +3138,15 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
   ptx.selected_transfers = selected_transfers;
   ptx.tx_key = tx_key;
   ptx.dests = dsts;
+  ptx.construction_data.sources = sources;
+  ptx.construction_data.destinations = dsts;
+  ptx.construction_data.change_dts = change_dts;
+  ptx.construction_data.extra = tx.extra;
+  ptx.construction_data.unlock_time = unlock_time;
+  ptx.construction_data.use_rct = false;
 }
 
-void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry> dsts, const std::list<transfer_container::iterator> selected_transfers, size_t fake_outputs_count,
+void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry> dsts, const std::list<size_t> selected_transfers, size_t fake_outputs_count,
   uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx, pending_tx &ptx)
 {
   using namespace cryptonote;
@@ -3007,9 +3168,9 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
   }
 
   uint64_t found_money = 0;
-  BOOST_FOREACH(auto it, selected_transfers)
+  BOOST_FOREACH(size_t idx, selected_transfers)
   {
-    found_money += it->amount();
+    found_money += m_transfers[idx].amount();
   }
 
   LOG_PRINT_L2("wanted " << print_money(needed_money) << ", found " << print_money(found_money) << ", fee " << print_money(fee));
@@ -3022,11 +3183,11 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
   //prepare inputs
   size_t i = 0, out_index = 0;
   std::vector<cryptonote::tx_source_entry> sources;
-  BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
+  BOOST_FOREACH(size_t idx, selected_transfers)
   {
     sources.resize(sources.size()+1);
     cryptonote::tx_source_entry& src = sources.back();
-    transfer_details& td = *it;
+    const transfer_details& td = m_transfers[idx];
     src.amount = td.amount();
     src.rct = td.is_rct();
     //paste mixin transaction
@@ -3096,6 +3257,12 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
   ptx.selected_transfers = selected_transfers;
   ptx.tx_key = tx_key;
   ptx.dests = dsts;
+  ptx.construction_data.sources = sources;
+  ptx.construction_data.destinations = dsts;
+  ptx.construction_data.change_dts = change_dts;
+  ptx.construction_data.extra = tx.extra;
+  ptx.construction_data.unlock_time = unlock_time;
+  ptx.construction_data.use_rct = true;
 }
 
 static size_t estimate_rct_tx_size(int n_inputs, int mixin, int n_outputs)
@@ -3225,7 +3392,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
   uint64_t needed_money;
   uint64_t accumulated_fee, accumulated_outputs, accumulated_change;
   struct TX {
-    std::list<transfer_container::iterator> selected_transfers;
+    std::list<size_t> selected_transfers;
     std::vector<cryptonote::tx_destination_entry> dsts;
     cryptonote::transaction tx;
     pending_tx ptx;
@@ -3332,7 +3499,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
     LOG_PRINT_L2("Picking output " << idx << ", amount " << print_money(td.amount()));
 
     // add this output to the list to spend
-    tx.selected_transfers.push_back(m_transfers.begin() + idx);
+    tx.selected_transfers.push_back(idx);
     uint64_t available_amount = td.amount();
     accumulated_outputs += available_amount;
 
@@ -3400,7 +3567,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
       auto txBlob = t_serializable_object_to_blob(test_ptx.tx);
       needed_fee = calculate_fee(fee_per_kb, txBlob, fee_multiplier);
       available_for_fee = test_ptx.fee + test_ptx.change_dts.amount + (!test_ptx.dust_added_to_fee ? test_ptx.dust : 0);
-      LOG_PRINT_L2("Made a " << txBlob.size() << " kB tx, with " << print_money(available_for_fee) << " available for fee (" <<
+      LOG_PRINT_L2("Made a " << ((txBlob.size() + 1023) / 1024) << " kB tx, with " << print_money(available_for_fee) << " available for fee (" <<
         print_money(needed_fee) << " needed)");
 
       if (needed_fee > available_for_fee && dsts[0].amount > 0)
@@ -3472,8 +3639,8 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
   {
     TX &tx = *i;
     uint64_t tx_money = 0;
-    for (std::list<transfer_container::iterator>::const_iterator mi = tx.selected_transfers.begin(); mi != tx.selected_transfers.end(); ++mi)
-      tx_money += (*mi)->amount();
+    for (size_t idx: tx.selected_transfers)
+      tx_money += m_transfers[idx].amount();
     LOG_PRINT_L1("  Transaction " << (1+std::distance(txes.begin(), i)) << "/" << txes.size() <<
       ": " << (tx.bytes+1023)/1024 << " kB, sending " << print_money(tx_money) << " in " << tx.selected_transfers.size() <<
       " outputs to " << tx.dsts.size() << " destination(s), including " <<
@@ -3491,7 +3658,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_all(const cryptono
   std::vector<size_t> unused_dust_indices;
   uint64_t accumulated_fee, accumulated_outputs, accumulated_change;
   struct TX {
-    std::list<transfer_container::iterator> selected_transfers;
+    std::list<size_t> selected_transfers;
     std::vector<cryptonote::tx_destination_entry> dsts;
     cryptonote::transaction tx;
     pending_tx ptx;
@@ -3543,7 +3710,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_all(const cryptono
     LOG_PRINT_L2("Picking output " << idx << ", amount " << print_money(td.amount()));
 
     // add this output to the list to spend
-    tx.selected_transfers.push_back(m_transfers.begin() + idx);
+    tx.selected_transfers.push_back(idx);
     uint64_t available_amount = td.amount();
     accumulated_outputs += available_amount;
 
@@ -3576,7 +3743,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_all(const cryptono
       auto txBlob = t_serializable_object_to_blob(test_ptx.tx);
       needed_fee = calculate_fee(fee_per_kb, txBlob, fee_multiplier);
       available_for_fee = test_ptx.fee + test_ptx.dests[0].amount + test_ptx.change_dts.amount;
-      LOG_PRINT_L2("Made a " << txBlob.size() << " kB tx, with " << print_money(available_for_fee) << " available for fee (" <<
+      LOG_PRINT_L2("Made a " << ((txBlob.size() + 1023) / 1024) << " kB tx, with " << print_money(available_for_fee) << " available for fee (" <<
         print_money(needed_fee) << " needed)");
 
       THROW_WALLET_EXCEPTION_IF(needed_fee > available_for_fee, error::wallet_internal_error, "Transaction cannot pay for itself");
@@ -3620,8 +3787,8 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_all(const cryptono
   {
     TX &tx = *i;
     uint64_t tx_money = 0;
-    for (std::list<transfer_container::iterator>::const_iterator mi = tx.selected_transfers.begin(); mi != tx.selected_transfers.end(); ++mi)
-      tx_money += (*mi)->amount();
+    for (size_t idx: tx.selected_transfers)
+      tx_money += m_transfers[idx].amount();
     LOG_PRINT_L1("  Transaction " << (1+std::distance(txes.begin(), i)) << "/" << txes.size() <<
       ": " << (tx.bytes+1023)/1024 << " kB, sending " << print_money(tx_money) << " in " << tx.selected_transfers.size() <<
       " outputs to " << tx.dsts.size() << " destination(s), including " <<
@@ -3658,14 +3825,14 @@ void wallet2::transfer_from(const std::vector<size_t> &outs, size_t num_outputs,
   // select all dust inputs for transaction
   // throw if there are none
   uint64_t money = 0;
-  std::list<transfer_container::iterator> selected_transfers;
+  std::list<size_t> selected_transfers;
 #if 1
   for (size_t n = 0; n < outs.size(); ++n)
   {
     const transfer_details& td = m_transfers[outs[n]];
     if (!td.m_spent)
     {
-      selected_transfers.push_back (m_transfers.begin() + outs[n]);
+      selected_transfers.push_back (outs[n]);
       money += td.amount();
       if (selected_transfers.size() >= num_outputs)
         break;
@@ -3693,11 +3860,11 @@ void wallet2::transfer_from(const std::vector<size_t> &outs, size_t num_outputs,
   //prepare inputs
   size_t i = 0;
   std::vector<cryptonote::tx_source_entry> sources;
-  BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
+  BOOST_FOREACH(size_t idx, selected_transfers)
   {
     sources.resize(sources.size()+1);
     cryptonote::tx_source_entry& src = sources.back();
-    transfer_details& td = *it;
+    const transfer_details& td = m_transfers[idx];
     src.amount = td.amount();
     src.rct = td.is_rct();
 
@@ -3754,6 +3921,12 @@ void wallet2::transfer_from(const std::vector<size_t> &outs, size_t num_outputs,
   ptx.selected_transfers = selected_transfers;
   ptx.tx_key = tx_key;
   ptx.dests = dsts;
+  ptx.construction_data.sources = sources;
+  ptx.construction_data.destinations = dsts;
+  ptx.construction_data.change_dts = change_dts;
+  ptx.construction_data.extra = tx.extra;
+  ptx.construction_data.unlock_time = unlock_time;
+  ptx.construction_data.use_rct = false;
 }
 
 //----------------------------------------------------------------------------------------------------
@@ -3969,9 +4142,9 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
         ptx_vector.push_back(ptx);
 
         // mark transfers to be used as "spent"
-        BOOST_FOREACH(transfer_container::iterator it, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx, ptx.selected_transfers)
         {
-          set_spent(*it, 0);
+          set_spent(idx, 0);
         }
       }
 
@@ -3981,9 +4154,9 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
       }
 
@@ -3999,9 +4172,9 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
       }
 
@@ -4018,9 +4191,9 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
       for (auto & ptx : ptx_vector)
       {
         // mark transfers to be used as not spent
-        BOOST_FOREACH(transfer_container::iterator it2, ptx.selected_transfers)
+        BOOST_FOREACH(size_t idx2, ptx.selected_transfers)
         {
-          set_unspent(*it2);
+          set_unspent(idx2);
         }
       }
 
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index dd7cd19dc..c1c8edcd8 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -151,6 +151,25 @@ namespace tools
         m_amount_in(utd.m_amount_in), m_amount_out(utd.m_amount_out), m_change(utd.m_change), m_block_height(height), m_dests(utd.m_dests), m_payment_id(utd.m_payment_id), m_timestamp(utd.m_timestamp) {}
     };
 
+    struct tx_construction_data
+    {
+      std::vector<cryptonote::tx_source_entry> sources;
+      std::vector<cryptonote::tx_destination_entry> destinations;
+      cryptonote::tx_destination_entry change_dts;
+      std::vector<uint8_t> extra;
+      uint64_t unlock_time;
+      bool use_rct;
+
+      BEGIN_SERIALIZE_OBJECT()
+        FIELD(sources)
+        FIELD(destinations)
+        FIELD(change_dts)
+        FIELD(extra)
+        VARINT_FIELD(unlock_time)
+        FIELD(use_rct)
+      END_SERIALIZE()
+    };
+
     typedef std::vector<transfer_details> transfer_container;
     typedef std::unordered_multimap<crypto::hash, payment_details> payment_container;
 
@@ -160,10 +179,41 @@ namespace tools
       uint64_t dust, fee;
       bool dust_added_to_fee;
       cryptonote::tx_destination_entry change_dts;
-      std::list<transfer_container::iterator> selected_transfers;
+      std::list<size_t> selected_transfers;
       std::string key_images;
       crypto::secret_key tx_key;
       std::vector<cryptonote::tx_destination_entry> dests;
+
+      tx_construction_data construction_data;
+
+      BEGIN_SERIALIZE_OBJECT()
+        FIELD(tx)
+        VARINT_FIELD(dust)
+        VARINT_FIELD(fee)
+        FIELD(dust_added_to_fee)
+        FIELD(change_dts)
+        FIELD(selected_transfers)
+        FIELD(key_images)
+        FIELD(tx_key)
+        FIELD(dests)
+        FIELD(construction_data)
+      END_SERIALIZE()
+    };
+
+    struct unsigned_tx_set
+    {
+      std::vector<tx_construction_data> txes;
+      BEGIN_SERIALIZE_OBJECT()
+        FIELD(txes)
+      END_SERIALIZE()
+    };
+
+    struct signed_tx_set
+    {
+      std::vector<pending_tx> ptx;
+      BEGIN_SERIALIZE_OBJECT()
+        FIELD(ptx)
+      END_SERIALIZE()
     };
 
     struct keys_file_data
@@ -298,13 +348,16 @@ namespace tools
     template<typename T>
     void transfer_from(const std::vector<size_t> &outs, size_t num_outputs, uint64_t unlock_time, uint64_t needed_fee, T destination_split_strategy, const tx_dust_policy& dust_policy, const std::vector<uint8_t>& extra, cryptonote::transaction& tx, pending_tx &ptx);
     template<typename T>
-    void transfer_selected(const std::vector<cryptonote::tx_destination_entry>& dsts, const std::list<transfer_container::iterator> selected_transfers, size_t fake_outputs_count,
+    void transfer_selected(const std::vector<cryptonote::tx_destination_entry>& dsts, const std::list<size_t> selected_transfers, size_t fake_outputs_count,
       uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction& tx, pending_tx &ptx);
-    void transfer_selected_rct(std::vector<cryptonote::tx_destination_entry> dsts, const std::list<transfer_container::iterator> selected_transfers, size_t fake_outputs_count,
+    void transfer_selected_rct(std::vector<cryptonote::tx_destination_entry> dsts, const std::list<size_t> selected_transfers, size_t fake_outputs_count,
       uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx, pending_tx &ptx);
 
     void commit_tx(pending_tx& ptx_vector);
     void commit_tx(std::vector<pending_tx>& ptx_vector);
+    bool save_tx(const std::vector<pending_tx>& ptx_vector, const std::string &filename);
+    bool sign_tx(const std::string &unsigned_filename, const std::string &signed_filename, std::function<bool(const unsigned_tx_set&)> accept_func = NULL);
+    bool load_tx(const std::string &signed_filename, std::vector<tools::wallet2::pending_tx> &ptx);
     std::vector<pending_tx> create_transactions(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t> extra, bool trusted_daemon);
     std::vector<wallet2::pending_tx> create_transactions_2(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t> extra, bool trusted_daemon);
     std::vector<wallet2::pending_tx> create_transactions_all(const cryptonote::account_public_address &address, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t> extra, bool trusted_daemon);
@@ -407,8 +460,8 @@ namespace tools
     std::vector<size_t> select_available_unmixable_outputs(bool trusted_daemon);
     std::vector<size_t> select_available_mixable_outputs(bool trusted_daemon);
 
-    size_t pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_dust_indices, const std::list<transfer_container::iterator>& selected_transfers) const;
-    size_t pop_best_value(std::vector<size_t> &unused_dust_indices, const std::list<transfer_container::iterator>& selected_transfers) const;
+    size_t pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_dust_indices, const std::list<size_t>& selected_transfers) const;
+    size_t pop_best_value(std::vector<size_t> &unused_dust_indices, const std::list<size_t>& selected_transfers) const;
 
     void set_tx_note(const crypto::hash &txid, const std::string &note);
     std::string get_tx_note(const crypto::hash &txid) const;
@@ -446,7 +499,7 @@ namespace tools
     void fast_refresh(uint64_t stop_height, uint64_t &blocks_start_height, std::list<crypto::hash> &short_chain_history);
     void pull_next_blocks(uint64_t start_height, uint64_t &blocks_start_height, std::list<crypto::hash> &short_chain_history, const std::list<cryptonote::block_complete_entry> &prev_blocks, std::list<cryptonote::block_complete_entry> &blocks, std::vector<cryptonote::COMMAND_RPC_GET_BLOCKS_FAST::block_output_indices> &o_indices, bool &error);
     void process_blocks(uint64_t start_height, const std::list<cryptonote::block_complete_entry> &blocks, const std::vector<cryptonote::COMMAND_RPC_GET_BLOCKS_FAST::block_output_indices> &o_indices, uint64_t& blocks_added);
-    uint64_t select_transfers(uint64_t needed_money, std::vector<size_t> unused_transfers_indices, std::list<transfer_container::iterator>& selected_transfers, bool trusted_daemon);
+    uint64_t select_transfers(uint64_t needed_money, std::vector<size_t> unused_transfers_indices, std::list<size_t>& selected_transfers, bool trusted_daemon);
     bool prepare_file_names(const std::string& file_path);
     void process_unconfirmed(const cryptonote::transaction& tx, uint64_t height);
     void process_outgoing(const cryptonote::transaction& tx, uint64_t height, uint64_t ts, uint64_t spent, uint64_t received);
@@ -462,10 +515,10 @@ namespace tools
     uint64_t get_fee_multiplier(uint32_t priority, bool use_new_fee) const;
     float get_output_relatedness(const transfer_details &td0, const transfer_details &td1) const;
     std::vector<size_t> pick_prefered_rct_inputs(uint64_t needed_money) const;
-    void set_spent(transfer_details &td, uint64_t height);
-    void set_unspent(transfer_details &td);
+    void set_spent(size_t idx, uint64_t height);
+    void set_unspent(size_t idx);
     template<typename entry>
-    void get_outs(std::vector<std::vector<entry>> &outs, const std::list<transfer_container::iterator> &selected_transfers, size_t fake_outputs_count);
+    void get_outs(std::vector<std::vector<entry>> &outs, const std::list<size_t> &selected_transfers, size_t fake_outputs_count);
 
     cryptonote::account_base m_account;
     std::string m_daemon_address;
@@ -737,7 +790,7 @@ namespace tools
 
     // randomly select inputs for transaction
     // throw if requested send amount is greater than amount available to send
-    std::list<transfer_container::iterator> selected_transfers;
+    std::list<size_t> selected_transfers;
     uint64_t found_money = select_transfers(needed_money, unused_transfers_indices, selected_transfers, trusted_daemon);
     THROW_WALLET_EXCEPTION_IF(found_money < needed_money, error::not_enough_money, found_money, needed_money - fee, fee);
 
@@ -749,8 +802,9 @@ namespace tools
     {
       COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::request req = AUTO_VAL_INIT(req);
       req.outs_count = fake_outputs_count + 1;// add one to make possible (if need) to skip real output key
-      BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
+      BOOST_FOREACH(size_t idx, selected_transfers)
       {
+        const transfer_container::const_iterator it = m_transfers.begin() + idx;
         THROW_WALLET_EXCEPTION_IF(it->m_tx.vout.size() <= it->m_internal_output_index, error::wallet_internal_error,
           "m_internal_output_index = " + std::to_string(it->m_internal_output_index) +
           " is greater or equal to outputs count = " + std::to_string(it->m_tx.vout.size()));
@@ -781,11 +835,11 @@ namespace tools
     //prepare inputs
     size_t i = 0;
     std::vector<cryptonote::tx_source_entry> sources;
-    BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
+    BOOST_FOREACH(size_t idx, selected_transfers)
     {
       sources.resize(sources.size()+1);
       cryptonote::tx_source_entry& src = sources.back();
-      transfer_details& td = *it;
+      const transfer_details& td = m_transfers[idx];
       src.amount = td.amount();
       src.rct = false;
       //paste mixin transaction
@@ -872,6 +926,12 @@ namespace tools
     ptx.selected_transfers = selected_transfers;
     ptx.tx_key = tx_key;
     ptx.dests = dsts;
+    ptx.construction_data.sources = sources;
+    ptx.construction_data.destinations = dsts;
+    ptx.construction_data.change_dts = change_dts;
+    ptx.construction_data.extra = tx.extra;
+    ptx.construction_data.unlock_time = unlock_time;
+    ptx.construction_data.use_rct = false;
   }
 
 
diff --git a/tests/unit_tests/output_selection.cpp b/tests/unit_tests/output_selection.cpp
index 4344d1ffc..d26f5ae1a 100644
--- a/tests/unit_tests/output_selection.cpp
+++ b/tests/unit_tests/output_selection.cpp
@@ -56,14 +56,14 @@ static tools::wallet2::transfer_container make_transfers_container(size_t N)
     auto i = std::find(unused_indices.begin(), unused_indices.end(), idx); \
     ASSERT_TRUE(i != unused_indices.end()); \
     unused_indices.erase(i); \
-    selected.push_back(transfers.begin() + idx); \
+    selected.push_back(idx); \
   } while(0)
 
 #define PICK(expected) \
   do { \
     size_t idx = w.pop_best_value_from(transfers, unused_indices, selected); \
     ASSERT_EQ(expected, idx); \
-    selected.push_back(transfers.begin() + idx); \
+    selected.push_back(idx); \
   } while(0)
 
 TEST(select_outputs, one_out_of_N)
@@ -76,7 +76,7 @@ TEST(select_outputs, one_out_of_N)
   tools::wallet2::transfer_container transfers = make_transfers_container(10);
   transfers[6].m_block_height = 700;
   std::vector<size_t> unused_indices({0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
-  std::list<tools::wallet2::transfer_container::iterator> selected;
+  std::list<size_t> selected;
   SELECT(2);
   PICK(6);
 }
@@ -93,7 +93,7 @@ TEST(select_outputs, order)
   transfers[3].m_block_height = 716;
   transfers[4].m_block_height = 701;
   std::vector<size_t> unused_indices({0, 1, 2, 3, 4});
-  std::list<tools::wallet2::transfer_container::iterator> selected;
+  std::list<size_t> selected;
   SELECT(0);
   PICK(3); // first the one that's far away
   PICK(2); // then the one that's close