device/trezor: HF10 support added, wallet::API

- import only key images generated by cold signing process
- wallet_api: trezor methods added
- wallet: button request code added
- const added to methods
- wallet2::get_tx_key_device() tries to decrypt stored tx private keys using the device.
- simplewallet supports get_tx_key and get_tx_proof on hw device using the get_tx_key feature
- live refresh enables refresh with trezor i.e. computing key images on the fly. More convenient and efficient for users.
- device: has_ki_live_refresh added
- a thread is watching whether live refresh is being computed, if not for 30 seconds, it terminates the live refresh process - switches Trezor state

19 files changed, 1272 insertions, 241 deletions

diff --git a/external/trezor-common b/external/trezor-common
-Subproject 588f8e03f5ac111adf719f0a437de67481a26ae
+Subproject cb238cb1f134accc4200217d9511115a8f61c6c
diff --git a/src/cryptonote_basic/cryptonote_format_utils.cpp b/src/cryptonote_basic/cryptonote_format_utils.cpp
index f4e7c9d36..4695a16e1 100644
--- a/src/cryptonote_basic/cryptonote_format_utils.cpp
+++ b/src/cryptonote_basic/cryptonote_format_utils.cpp
@@ -282,6 +282,11 @@ namespace cryptonote
   //---------------------------------------------------------------
   bool generate_key_image_helper_precomp(const account_keys& ack, const crypto::public_key& out_key, const crypto::key_derivation& recv_derivation, size_t real_output_index, const subaddress_index& received_index, keypair& in_ephemeral, crypto::key_image& ki, hw::device &hwdev)
   {
+    if (hwdev.compute_key_image(ack, out_key, recv_derivation, real_output_index, received_index, in_ephemeral, ki))
+    {
+      return true;
+    }
+
     if (ack.m_spend_secret_key == crypto::null_skey)
     {
       // for watch-only wallet, simply copy the known output pubkey
diff --git a/src/device/device.hpp b/src/device/device.hpp
index 408f64c8b..471302bc4 100644
--- a/src/device/device.hpp
+++ b/src/device/device.hpp
@@ -70,6 +70,7 @@ namespace cryptonote
     struct account_keys;
     struct subaddress_index;
     struct tx_destination_entry;
+    struct keypair;
 }
 
 namespace hw {
@@ -81,11 +82,18 @@ namespace hw {
            return false;
     }
 
+    class device_progress {
+    public:
+      virtual double progress() const { return 0; }
+      virtual bool indeterminate() const { return false; }
+    };
+
     class i_device_callback {
     public:
-        virtual void on_button_request() {}
-        virtual void on_pin_request(epee::wipeable_string & pin) {}
-        virtual void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase) {}
+        virtual void on_button_request(uint64_t code=0) {}
+        virtual boost::optional<epee::wipeable_string> on_pin_request() { return boost::none; }
+        virtual boost::optional<epee::wipeable_string> on_passphrase_request(bool on_device) { return boost::none; }
+        virtual void on_progress(const device_progress& event) {}
         virtual ~i_device_callback() = default;
     };
 
@@ -141,6 +149,9 @@ namespace hw {
         virtual void set_callback(i_device_callback * callback) {};
         virtual void set_derivation_path(const std::string &derivation_path) {};
 
+        virtual void set_pin(const epee::wipeable_string & pin) {}
+        virtual void set_passphrase(const epee::wipeable_string & passphrase) {}
+
         /* ======================================================================= */
         /*  LOCKER                                                                 */
         /* ======================================================================= */ 
@@ -229,7 +240,9 @@ namespace hw {
 
         virtual bool  has_ki_cold_sync(void) const { return false; }
         virtual bool  has_tx_cold_sign(void) const { return false; }
-
+        virtual bool  has_ki_live_refresh(void) const { return true; }
+        virtual bool  compute_key_image(const cryptonote::account_keys& ack, const crypto::public_key& out_key, const crypto::key_derivation& recv_derivation, size_t real_output_index, const cryptonote::subaddress_index& received_index, cryptonote::keypair& in_ephemeral, crypto::key_image& ki) { return false; }
+        virtual void  computing_key_images(bool started) {};
         virtual void  set_network_type(cryptonote::network_type network_type) { }
 
     protected:
diff --git a/src/device/device_cold.hpp b/src/device/device_cold.hpp
index 22128cec1..44c42020a 100644
--- a/src/device/device_cold.hpp
+++ b/src/device/device_cold.hpp
@@ -31,6 +31,7 @@
 #define MONERO_DEVICE_COLD_H
 
 #include "wallet/wallet2.h"
+#include <boost/optional/optional.hpp>
 #include <boost/function.hpp>
 
 
@@ -44,6 +45,8 @@ namespace hw {
   public:
     std::vector<std::string> tx_device_aux;  // device generated aux data
     std::vector<cryptonote::address_parse_info> tx_recipients;  // as entered by user
+    boost::optional<int> bp_version;  // BP version to use
+    boost::optional<unsigned> client_version;  // Signing client version to use (testing)
   };
 
   class device_cold {
@@ -51,6 +54,53 @@ namespace hw {
 
     using exported_key_image = std::vector<std::pair<crypto::key_image, crypto::signature>>;
 
+    class op_progress : public hw::device_progress {
+    public:
+      op_progress():m_progress(0), m_indeterminate(false) {};
+      explicit op_progress(double progress, bool indeterminate=false): m_progress(progress), m_indeterminate(indeterminate){}
+
+      double progress() const override { return m_progress; }
+      bool indeterminate() const override { return m_indeterminate; }
+    protected:
+      double m_progress;
+      bool m_indeterminate;
+    };
+
+    class tx_progress : public op_progress {
+    public:
+      tx_progress():
+        m_cur_tx(0), m_max_tx(1),
+        m_cur_step(0), m_max_step(1),
+        m_cur_substep(0), m_max_substep(1){};
+
+      tx_progress(size_t cur_tx, size_t max_tx, size_t cur_step, size_t max_step, size_t cur_substep, size_t max_substep):
+        m_cur_tx(cur_tx), m_max_tx(max_tx),
+        m_cur_step(cur_tx), m_max_step(max_tx),
+        m_cur_substep(cur_tx), m_max_substep(max_tx){}
+
+      double progress() const override {
+        return std::max(1.0, (double)m_cur_tx / m_max_tx
+          + (double)m_cur_step / (m_max_tx * m_max_step)
+          + (double)m_cur_substep / (m_max_tx * m_max_step * m_max_substep));
+      }
+      bool indeterminate() const override { return false; }
+
+    protected:
+      size_t m_cur_tx;
+      size_t m_max_tx;
+      size_t m_cur_step;
+      size_t m_max_step;
+      size_t m_cur_substep;
+      size_t m_max_substep;
+    };
+
+    typedef struct {
+      std::string salt1;
+      std::string salt2;
+      std::string tx_enc_keys;
+      std::string tx_prefix_hash;
+    } tx_key_data_t;
+
     /**
      * Key image sync with the cold protocol.
      */
@@ -65,6 +115,52 @@ namespace hw {
                  const ::tools::wallet2::unsigned_tx_set & unsigned_tx,
                  ::tools::wallet2::signed_tx_set & signed_tx,
                  tx_aux_data & aux_data) =0;
+
+    /**
+     * Get tx key support check.
+     */
+    virtual bool is_get_tx_key_supported() const { return false; }
+
+    /**
+     * Loads TX aux data required for tx key.
+     */
+    virtual void load_tx_key_data(tx_key_data_t & res, const std::string & tx_aux_data) =0;
+
+    /**
+     * Decrypts TX keys.
+     */
+    virtual void get_tx_key(
+        std::vector<::crypto::secret_key> & tx_keys,
+        const tx_key_data_t & tx_aux_data,
+        const ::crypto::secret_key & view_key_priv) =0;
+
+    /**
+     * Live refresh support check
+     */
+    virtual bool is_live_refresh_supported() const { return false; };
+
+    /**
+     * Starts live refresh process with the device
+     */
+    virtual void live_refresh_start() =0;
+
+    /**
+     * One live refresh step
+     */
+    virtual void live_refresh(
+        const ::crypto::secret_key & view_key_priv,
+        const crypto::public_key& out_key,
+        const crypto::key_derivation& recv_derivation,
+        size_t real_output_index,
+        const cryptonote::subaddress_index& received_index,
+        cryptonote::keypair& in_ephemeral,
+        crypto::key_image& ki
+    ) =0;
+
+    /**
+     * Live refresh process termination
+     */
+    virtual void live_refresh_finish() =0;
   };
 }
 
diff --git a/src/device_trezor/device_trezor.cpp b/src/device_trezor/device_trezor.cpp
index e1b079044..0c3f1bd31 100644
--- a/src/device_trezor/device_trezor.cpp
+++ b/src/device_trezor/device_trezor.cpp
@@ -57,7 +57,9 @@ namespace trezor {
     }
 
     device_trezor::device_trezor() {
-
+      m_live_refresh_in_progress = false;
+      m_live_refresh_enabled = true;
+      m_live_refresh_thread_running = false;
     }
 
     device_trezor::~device_trezor() {
@@ -69,6 +71,89 @@ namespace trezor {
       }
     }
 
+    bool device_trezor::init()
+    {
+      m_live_refresh_in_progress = false;
+      bool r = device_trezor_base::init();
+      if (r && !m_live_refresh_thread)
+      {
+        m_live_refresh_thread_running = true;
+        m_live_refresh_thread.reset(new boost::thread(boost::bind(&device_trezor::live_refresh_thread_main, this)));
+      }
+      return r;
+    }
+
+    bool device_trezor::release()
+    {
+      m_live_refresh_in_progress = false;
+      m_live_refresh_thread_running = false;
+      if (m_live_refresh_thread)
+      {
+        m_live_refresh_thread->join();
+        m_live_refresh_thread = nullptr;
+      }
+      return device_trezor_base::release();
+    }
+
+    bool device_trezor::disconnect()
+    {
+      m_live_refresh_in_progress = false;
+      return device_trezor_base::disconnect();
+    }
+
+    void device_trezor::device_state_reset_unsafe()
+    {
+      require_connected();
+      if (m_live_refresh_in_progress)
+      {
+        try
+        {
+          live_refresh_finish_unsafe();
+        }
+        catch(const std::exception & e)
+        {
+          MERROR("Live refresh could not be terminated: " << e.what());
+        }
+      }
+
+      m_live_refresh_in_progress = false;
+      device_trezor_base::device_state_reset_unsafe();
+    }
+
+    void device_trezor::live_refresh_thread_main()
+    {
+      while(m_live_refresh_thread_running)
+      {
+        boost::this_thread::sleep_for(boost::chrono::milliseconds(100));
+        if (!m_live_refresh_in_progress)
+        {
+          continue;
+        }
+
+        TREZOR_AUTO_LOCK_DEVICE();
+        if (!m_transport || !m_live_refresh_in_progress)
+        {
+          continue;
+        }
+
+        auto current_time = std::chrono::steady_clock::now();
+        if (current_time - m_last_live_refresh_time <= std::chrono::seconds(20))
+        {
+          continue;
+        }
+
+        MTRACE("Closing live refresh process due to inactivity");
+        try
+        {
+          live_refresh_finish();
+        }
+        catch(const std::exception &e)
+        {
+          MWARNING("Live refresh auto-finish failed: " << e.what());
+        }
+      }
+    }
+
     /* ======================================================================= */
     /*                             WALLET & ADDRESS                            */
     /* ======================================================================= */
@@ -126,7 +211,7 @@ namespace trezor {
     std::shared_ptr<messages::monero::MoneroAddress> device_trezor::get_address(
         const boost::optional<std::vector<uint32_t>> & path,
         const boost::optional<cryptonote::network_type> & network_type){
-      AUTO_LOCK_CMD();
+      TREZOR_AUTO_LOCK_CMD();
       require_connected();
       device_state_reset_unsafe();
       require_initialized();
@@ -142,7 +227,7 @@ namespace trezor {
     std::shared_ptr<messages::monero::MoneroWatchKey> device_trezor::get_view_key(
         const boost::optional<std::vector<uint32_t>> & path,
         const boost::optional<cryptonote::network_type> & network_type){
-      AUTO_LOCK_CMD();
+      TREZOR_AUTO_LOCK_CMD();
       require_connected();
       device_state_reset_unsafe();
       require_initialized();
@@ -155,11 +240,43 @@ namespace trezor {
       return response;
     }
 
+    bool device_trezor::is_get_tx_key_supported() const
+    {
+      require_initialized();
+      return get_version() > pack_version(2, 0, 10);
+    }
+
+    void device_trezor::load_tx_key_data(::hw::device_cold::tx_key_data_t & res, const std::string & tx_aux_data)
+    {
+      protocol::tx::load_tx_key_data(res, tx_aux_data);
+    }
+
+    void device_trezor::get_tx_key(
+        std::vector<::crypto::secret_key> & tx_keys,
+        const ::hw::device_cold::tx_key_data_t & tx_aux_data,
+        const ::crypto::secret_key & view_key_priv)
+    {
+      TREZOR_AUTO_LOCK_CMD();
+      require_connected();
+      device_state_reset_unsafe();
+      require_initialized();
+
+      auto req = protocol::tx::get_tx_key(tx_aux_data);
+      this->set_msg_addr<messages::monero::MoneroGetTxKeyRequest>(req.get());
+
+      auto response = this->client_exchange<messages::monero::MoneroGetTxKeyAck>(req);
+      MTRACE("Get TX key response received");
+
+      protocol::tx::get_tx_key_ack(tx_keys, tx_aux_data.tx_prefix_hash, view_key_priv, response);
+    }
+
     void device_trezor::ki_sync(wallet_shim * wallet,
                                 const std::vector<tools::wallet2::transfer_details> & transfers,
                                 hw::device_cold::exported_key_image & ski)
     {
-      AUTO_LOCK_CMD();
+#define EVENT_PROGRESS(P) do { if (m_callback) {(m_callback)->on_progress(device_cold::op_progress(P)); } }while(0)
+
+      TREZOR_AUTO_LOCK_CMD();
       require_connected();
       device_state_reset_unsafe();
       require_initialized();
@@ -171,6 +288,7 @@ namespace trezor {
       protocol::ki::key_image_data(wallet, transfers, mtds);
       protocol::ki::generate_commitment(mtds, transfers, req);
 
+      EVENT_PROGRESS(0.);
       this->set_msg_addr<messages::monero::MoneroKeyImageExportInitRequest>(req.get());
       auto ack1 = this->client_exchange<messages::monero::MoneroKeyImageExportInitAck>(req);
 
@@ -194,27 +312,160 @@ namespace trezor {
         }
 
         MTRACE("Batch " << cur << " / " << num_batches << " batches processed");
+        EVENT_PROGRESS((double)cur * batch_size / mtds.size());
       }
+      EVENT_PROGRESS(1.);
 
       auto final_req = std::make_shared<messages::monero::MoneroKeyImageSyncFinalRequest>();
       auto final_ack = this->client_exchange<messages::monero::MoneroKeyImageSyncFinalAck>(final_req);
       ski.reserve(kis.size());
 
       for(auto & sub : kis){
-        char buff[32*3];
+        ::crypto::signature sig{};
+        ::crypto::key_image ki;
+        char buff[sizeof(ki.data)*3];
+
+        size_t buff_len = sizeof(buff);
+
         protocol::crypto::chacha::decrypt(sub.blob().data(), sub.blob().size(),
                                           reinterpret_cast<const uint8_t *>(final_ack->enc_key().data()),
-                                          reinterpret_cast<const uint8_t *>(sub.iv().data()), buff);
+                                          reinterpret_cast<const uint8_t *>(sub.iv().data()), buff, &buff_len);
+        CHECK_AND_ASSERT_THROW_MES(buff_len == sizeof(buff), "Plaintext size invalid");
 
-        ::crypto::signature sig{};
-        ::crypto::key_image ki;
-        memcpy(ki.data, buff, 32);
-        memcpy(sig.c.data, buff + 32, 32);
-        memcpy(sig.r.data, buff + 64, 32);
+        memcpy(ki.data, buff, sizeof(ki.data));
+        memcpy(sig.c.data, buff + sizeof(ki.data), sizeof(ki.data));
+        memcpy(sig.r.data, buff + 2*sizeof(ki.data), sizeof(ki.data));
         ski.push_back(std::make_pair(ki, sig));
       }
+#undef EVENT_PROGRESS
+    }
+
+    bool device_trezor::is_live_refresh_supported() const
+    {
+      require_initialized();
+      return get_version() > pack_version(2, 0, 10);
     }
 
+    bool device_trezor::is_live_refresh_enabled() const
+    {
+      return is_live_refresh_supported() && (mode == NONE || mode == TRANSACTION_PARSE) && m_live_refresh_enabled;
+    }
+
+    bool device_trezor::has_ki_live_refresh() const
+    {
+      try{
+        return is_live_refresh_enabled();
+      } catch(const std::exception & e){
+        MERROR("Could not detect if live refresh is enabled: " << e.what());
+      }
+      return false;
+    }
+
+    void device_trezor::live_refresh_start()
+    {
+      TREZOR_AUTO_LOCK_CMD();
+      require_connected();
+      live_refresh_start_unsafe();
+    }
+
+    void device_trezor::live_refresh_start_unsafe()
+    {
+      device_state_reset_unsafe();
+      require_initialized();
+
+      auto req = std::make_shared<messages::monero::MoneroLiveRefreshStartRequest>();
+      this->set_msg_addr<messages::monero::MoneroLiveRefreshStartRequest>(req.get());
+      this->client_exchange<messages::monero::MoneroLiveRefreshStartAck>(req);
+      m_live_refresh_in_progress = true;
+      m_last_live_refresh_time = std::chrono::steady_clock::now();
+    }
+
+    void device_trezor::live_refresh(
+        const ::crypto::secret_key & view_key_priv,
+        const crypto::public_key& out_key,
+        const crypto::key_derivation& recv_derivation,
+        size_t real_output_index,
+        const cryptonote::subaddress_index& received_index,
+        cryptonote::keypair& in_ephemeral,
+        crypto::key_image& ki
+    )
+    {
+      TREZOR_AUTO_LOCK_CMD();
+      require_connected();
+
+      if (!m_live_refresh_in_progress)
+      {
+        live_refresh_start_unsafe();
+      }
+
+      m_last_live_refresh_time = std::chrono::steady_clock::now();
+
+      auto req = std::make_shared<messages::monero::MoneroLiveRefreshStepRequest>();
+      req->set_out_key(out_key.data, 32);
+      req->set_recv_deriv(recv_derivation.data, 32);
+      req->set_real_out_idx(real_output_index);
+      req->set_sub_addr_major(received_index.major);
+      req->set_sub_addr_minor(received_index.minor);
+
+      auto ack = this->client_exchange<messages::monero::MoneroLiveRefreshStepAck>(req);
+      protocol::ki::live_refresh_ack(view_key_priv, out_key, ack, in_ephemeral, ki);
+    }
+
+    void device_trezor::live_refresh_finish_unsafe()
+    {
+      auto req = std::make_shared<messages::monero::MoneroLiveRefreshFinalRequest>();
+      this->client_exchange<messages::monero::MoneroLiveRefreshFinalAck>(req);
+      m_live_refresh_in_progress = false;
+    }
+
+    void device_trezor::live_refresh_finish()
+    {
+      TREZOR_AUTO_LOCK_CMD();
+      require_connected();
+      if (m_live_refresh_in_progress)
+      {
+        live_refresh_finish_unsafe();
+      }
+    }
+
+    void device_trezor::computing_key_images(bool started)
+    {
+      try
+      {
+        if (!is_live_refresh_enabled())
+        {
+          return;
+        }
+
+        // React only on termination as the process can auto-start itself.
+        if (!started && m_live_refresh_in_progress)
+        {
+          live_refresh_finish();
+        }
+      }
+      catch(const std::exception & e)
+      {
+        MWARNING("KI computation state change failed, started: " << started << ", e: " << e.what());
+      }
+    }
+
+    bool device_trezor::compute_key_image(
+        const ::cryptonote::account_keys& ack,
+        const ::crypto::public_key& out_key,
+        const ::crypto::key_derivation& recv_derivation,
+        size_t real_output_index,
+        const ::cryptonote::subaddress_index& received_index,
+        ::cryptonote::keypair& in_ephemeral,
+        ::crypto::key_image& ki)
+    {
+      if (!is_live_refresh_enabled())
+      {
+        return false;
+      }
+
+      live_refresh(ack.m_view_secret_key, out_key, recv_derivation, real_output_index, received_index, in_ephemeral, ki);
+      return true;
+    }
 
     void device_trezor::tx_sign(wallet_shim * wallet,
                                 const tools::wallet2::unsigned_tx_set & unsigned_tx,
@@ -222,7 +473,15 @@ namespace trezor {
                                 hw::tx_aux_data & aux_data)
     {
       CHECK_AND_ASSERT_THROW_MES(unsigned_tx.transfers.first == 0, "Unsuported non zero offset");
-      size_t num_tx = unsigned_tx.txes.size();
+
+      TREZOR_AUTO_LOCK_CMD();
+      require_connected();
+      device_state_reset_unsafe();
+      require_initialized();
+      transaction_versions_check(unsigned_tx, aux_data);
+
+      const size_t num_tx = unsigned_tx.txes.size();
+      m_num_transations_to_sign = num_tx;
       signed_tx.key_images.clear();
       signed_tx.key_images.resize(unsigned_tx.transfers.second.size());
 
@@ -267,6 +526,10 @@ namespace trezor {
         cpend.key_images = key_images;
 
         // KI sync
+        for(size_t cidx=0, trans_max=unsigned_tx.transfers.second.size(); cidx < trans_max; ++cidx){
+          signed_tx.key_images[cidx] = unsigned_tx.transfers.second[cidx].m_key_image;
+        }
+
         size_t num_sources = cdata.tx_data.sources.size();
         CHECK_AND_ASSERT_THROW_MES(num_sources == cdata.source_permutation.size(), "Invalid permutation size");
         CHECK_AND_ASSERT_THROW_MES(num_sources == cdata.tx.vin.size(), "Invalid tx.vin size");
@@ -276,12 +539,19 @@ namespace trezor {
           CHECK_AND_ASSERT_THROW_MES(src_idx < cdata.tx.vin.size(), "Invalid idx_mapped");
 
           size_t idx_map_src = cdata.tx_data.selected_transfers[idx_mapped];
-          auto vini = boost::get<cryptonote::txin_to_key>(cdata.tx.vin[src_idx]);
+          CHECK_AND_ASSERT_THROW_MES(idx_map_src >= unsigned_tx.transfers.first, "Invalid offset");
 
+          idx_map_src -= unsigned_tx.transfers.first;
           CHECK_AND_ASSERT_THROW_MES(idx_map_src < signed_tx.key_images.size(), "Invalid key image index");
+
+          const auto vini = boost::get<cryptonote::txin_to_key>(cdata.tx.vin[src_idx]);
           signed_tx.key_images[idx_map_src] = vini.k_image;
         }
       }
+
+      if (m_callback){
+        m_callback->on_progress(device_cold::tx_progress(m_num_transations_to_sign, m_num_transations_to_sign, 1, 1, 1, 1));
+      }
     }
 
     void device_trezor::tx_sign(wallet_shim * wallet,
@@ -290,10 +560,16 @@ namespace trezor {
                    hw::tx_aux_data & aux_data,
                    std::shared_ptr<protocol::tx::Signer> & signer)
     {
-      AUTO_LOCK_CMD();
+#define EVENT_PROGRESS(S, SUB, SUBMAX) do { if (m_callback) { \
+      (m_callback)->on_progress(device_cold::tx_progress(idx, m_num_transations_to_sign, S, 10, SUB, SUBMAX)); \
+} }while(0)
+
       require_connected();
-      device_state_reset_unsafe();
+      if (idx > 0)
+        device_state_reset_unsafe();
+
       require_initialized();
+      EVENT_PROGRESS(0, 1, 1);
 
       CHECK_AND_ASSERT_THROW_MES(idx < unsigned_tx.txes.size(), "Invalid transaction index");
       signer = std::make_shared<protocol::tx::Signer>(wallet, &unsigned_tx, idx, &aux_data);
@@ -305,6 +581,7 @@ namespace trezor {
       auto init_msg = signer->step_init();
       this->set_msg_addr(init_msg.get());
       transaction_pre_check(init_msg);
+      EVENT_PROGRESS(1, 1, 1);
 
       auto response = this->client_exchange<messages::monero::MoneroTransactionInitAck>(init_msg);
       signer->step_init_ack(response);
@@ -314,6 +591,7 @@ namespace trezor {
         auto src = signer->step_set_input(cur_src);
         auto ack = this->client_exchange<messages::monero::MoneroTransactionSetInputAck>(src);
         signer->step_set_input_ack(ack);
+        EVENT_PROGRESS(2, cur_src, num_sources);
       }
 
       // Step: sort
@@ -322,44 +600,82 @@ namespace trezor {
         auto perm_ack = this->client_exchange<messages::monero::MoneroTransactionInputsPermutationAck>(perm_req);
         signer->step_permutation_ack(perm_ack);
       }
+      EVENT_PROGRESS(3, 1, 1);
 
       // Step: input_vini
-      if (!signer->in_memory()){
-        for(size_t cur_src = 0; cur_src < num_sources; ++cur_src){
-          auto src = signer->step_set_vini_input(cur_src);
-          auto ack = this->client_exchange<messages::monero::MoneroTransactionInputViniAck>(src);
-          signer->step_set_vini_input_ack(ack);
-        }
+      for(size_t cur_src = 0; cur_src < num_sources; ++cur_src){
+        auto src = signer->step_set_vini_input(cur_src);
+        auto ack = this->client_exchange<messages::monero::MoneroTransactionInputViniAck>(src);
+        signer->step_set_vini_input_ack(ack);
+        EVENT_PROGRESS(4, cur_src, num_sources);
       }
 
       // Step: all inputs set
       auto all_inputs_set = signer->step_all_inputs_set();
       auto ack_all_inputs = this->client_exchange<messages::monero::MoneroTransactionAllInputsSetAck>(all_inputs_set);
       signer->step_all_inputs_set_ack(ack_all_inputs);
+      EVENT_PROGRESS(5, 1, 1);
 
       // Step: outputs
       for(size_t cur_dst = 0; cur_dst < num_outputs; ++cur_dst){
         auto src = signer->step_set_output(cur_dst);
         auto ack = this->client_exchange<messages::monero::MoneroTransactionSetOutputAck>(src);
         signer->step_set_output_ack(ack);
+
+        // If BP is offloaded to host, another step with computed BP may be needed.
+        auto offloaded_bp = signer->step_rsig(cur_dst);
+        if (offloaded_bp){
+          auto bp_ack = this->client_exchange<messages::monero::MoneroTransactionSetOutputAck>(offloaded_bp);
+          signer->step_set_rsig_ack(ack);
+        }
+
+        EVENT_PROGRESS(6, cur_dst, num_outputs);
       }
 
       // Step: all outs set
       auto all_out_set = signer->step_all_outs_set();
       auto ack_all_out_set = this->client_exchange<messages::monero::MoneroTransactionAllOutSetAck>(all_out_set);
       signer->step_all_outs_set_ack(ack_all_out_set, *this);
+      EVENT_PROGRESS(7, 1, 1);
 
       // Step: sign each input
       for(size_t cur_src = 0; cur_src < num_sources; ++cur_src){
         auto src = signer->step_sign_input(cur_src);
         auto ack_sign = this->client_exchange<messages::monero::MoneroTransactionSignInputAck>(src);
         signer->step_sign_input_ack(ack_sign);
+        EVENT_PROGRESS(8, cur_src, num_sources);
       }
 
       // Step: final
       auto final_msg = signer->step_final();
       auto ack_final = this->client_exchange<messages::monero::MoneroTransactionFinalAck>(final_msg);
       signer->step_final_ack(ack_final);
+      EVENT_PROGRESS(9, 1, 1);
+#undef EVENT_PROGRESS
+    }
+
+    void device_trezor::transaction_versions_check(const ::tools::wallet2::unsigned_tx_set & unsigned_tx, hw::tx_aux_data & aux_data)
+    {
+      auto trezor_version = get_version();
+      unsigned client_version = 1;  // default client version for tx
+
+      if (trezor_version <= pack_version(2, 0, 10)){
+        client_version = 0;
+      }
+
+      if (aux_data.client_version){
+        auto wanted_client_version = aux_data.client_version.get();
+        if (wanted_client_version > client_version){
+          throw exc::TrezorException("Trezor firmware 2.0.10 and lower does not support current transaction sign protocol. Please update.");
+        } else {
+          client_version = wanted_client_version;
+        }
+      }
+      aux_data.client_version = client_version;
+
+      if (client_version == 0 && aux_data.bp_version && aux_data.bp_version.get() != 1){
+        throw exc::TrezorException("Trezor firmware 2.0.10 and lower does not support current transaction sign protocol (BPv2+). Please update.");
+      }
     }
 
     void device_trezor::transaction_pre_check(std::shared_ptr<messages::monero::MoneroTransactionInitRequest> init_msg)
@@ -396,7 +712,7 @@ namespace trezor {
 
       const bool nonce_required = tdata.tsx_data.has_payment_id() && tdata.tsx_data.payment_id().size() > 0;
       const bool has_nonce = cryptonote::find_tx_extra_field_by_type(tx_extra_fields, nonce);
-      CHECK_AND_ASSERT_THROW_MES(has_nonce == nonce_required, "Transaction nonce presence inconsistent");
+      CHECK_AND_ASSERT_THROW_MES(has_nonce || !nonce_required, "Transaction nonce not present");
 
       if (nonce_required){
         const std::string & payment_id = tdata.tsx_data.payment_id();
diff --git a/src/device_trezor/device_trezor.hpp b/src/device_trezor/device_trezor.hpp
index 1f08be887..24960cc1f 100644
--- a/src/device_trezor/device_trezor.hpp
+++ b/src/device_trezor/device_trezor.hpp
@@ -30,18 +30,21 @@
 #ifndef MONERO_DEVICE_TREZOR_H
 #define MONERO_DEVICE_TREZOR_H
 
+#include "trezor.hpp"
+#include "device/device.hpp"
 
+#ifdef WITH_DEVICE_TREZOR
 #include <cstddef>
 #include <string>
-#include "device/device.hpp"
-#include "device/device_default.hpp"
-#include "device/device_cold.hpp"
 #include <boost/scope_exit.hpp>
 #include <boost/thread/mutex.hpp>
 #include <boost/thread/recursive_mutex.hpp>
+
+#include "device/device_default.hpp"
+#include "device/device_cold.hpp"
 #include "cryptonote_config.h"
-#include "trezor.hpp"
 #include "device_trezor_base.hpp"
+#endif
 
 namespace hw {
 namespace trezor {
@@ -57,8 +60,29 @@ namespace trezor {
    */
   class device_trezor : public hw::trezor::device_trezor_base, public hw::device_cold {
     protected:
+      std::atomic<bool> m_live_refresh_in_progress;
+      std::chrono::steady_clock::time_point m_last_live_refresh_time;
+      std::unique_ptr<boost::thread> m_live_refresh_thread;
+      std::atomic<bool> m_live_refresh_thread_running;
+      bool m_live_refresh_enabled;
+      size_t m_num_transations_to_sign;
+
+      void transaction_versions_check(const ::tools::wallet2::unsigned_tx_set & unsigned_tx, hw::tx_aux_data & aux_data);
       void transaction_pre_check(std::shared_ptr<messages::monero::MoneroTransactionInitRequest> init_msg);
       void transaction_check(const protocol::tx::TData & tdata, const hw::tx_aux_data & aux_data);
+      void device_state_reset_unsafe() override;
+      void live_refresh_start_unsafe();
+      void live_refresh_finish_unsafe();
+      void live_refresh_thread_main();
+
+      /**
+       * Signs particular transaction idx in the unsigned set, keeps state in the signer
+       */
+      virtual void tx_sign(wallet_shim * wallet,
+                   const ::tools::wallet2::unsigned_tx_set & unsigned_tx,
+                   size_t idx,
+                   hw::tx_aux_data & aux_data,
+                   std::shared_ptr<protocol::tx::Signer> & signer);
 
     public:
       device_trezor();
@@ -69,11 +93,17 @@ namespace trezor {
 
       explicit operator bool() const override {return true;}
 
+      bool init() override;
+      bool release() override;
+      bool disconnect() override;
+
       device_protocol_t device_protocol() const override { return PROTOCOL_COLD; };
 
       bool  has_ki_cold_sync() const override { return true; }
       bool  has_tx_cold_sign() const override { return true; }
       void  set_network_type(cryptonote::network_type network_type) override { this->network_type = network_type; }
+      void  set_live_refresh_enabled(bool enabled) { m_live_refresh_enabled = enabled; }
+      bool  live_refresh_enabled() const { return m_live_refresh_enabled; }
 
       /* ======================================================================= */
       /*                             WALLET & ADDRESS                            */
@@ -100,20 +130,68 @@ namespace trezor {
           const boost::optional<cryptonote::network_type> & network_type = boost::none);
 
       /**
+       * Get_tx_key support check
+       */
+      bool is_get_tx_key_supported() const override;
+
+      /**
+       * Loads tx aux data
+       */
+      void load_tx_key_data(::hw::device_cold::tx_key_data_t & res, const std::string & tx_aux_data) override;
+
+      /**
+       * TX key load with the Trezor
+       */
+      void get_tx_key(
+        std::vector<::crypto::secret_key> & tx_keys,
+        const ::hw::device_cold::tx_key_data_t & tx_aux_data,
+        const ::crypto::secret_key & view_key_priv) override;
+
+      /**
        * Key image sync with the Trezor.
        */
       void ki_sync(wallet_shim * wallet,
                    const std::vector<::tools::wallet2::transfer_details> & transfers,
                    hw::device_cold::exported_key_image & ski) override;
 
+      bool is_live_refresh_supported() const override;
+
+      bool is_live_refresh_enabled() const;
+
+      bool has_ki_live_refresh() const override;
+
+      void live_refresh_start() override;
+
+      void live_refresh(
+          const ::crypto::secret_key & view_key_priv,
+          const crypto::public_key& out_key,
+          const crypto::key_derivation& recv_derivation,
+          size_t real_output_index,
+          const cryptonote::subaddress_index& received_index,
+          cryptonote::keypair& in_ephemeral,
+          crypto::key_image& ki
+          ) override;
+
+      void live_refresh_finish() override;
+
       /**
-       * Signs particular transaction idx in the unsigned set, keeps state in the signer
+       * Letting device know the KI computation started / ended.
+       * During refresh
        */
-      void tx_sign(wallet_shim * wallet,
-                   const ::tools::wallet2::unsigned_tx_set & unsigned_tx,
-                   size_t idx,
-                   hw::tx_aux_data & aux_data,
-                   std::shared_ptr<protocol::tx::Signer> & signer);
+      void computing_key_images(bool started) override;
+
+      /**
+       * Implements hw::device interface
+       * called from generate_key_image_helper_precomp()
+       */
+      bool compute_key_image(
+          const ::cryptonote::account_keys& ack,
+          const ::crypto::public_key& out_key,
+          const ::crypto::key_derivation& recv_derivation,
+          size_t real_output_index,
+          const ::cryptonote::subaddress_index& received_index,
+          ::cryptonote::keypair& in_ephemeral,
+          ::crypto::key_image& ki) override;
 
       /**
        * Signs unsigned transaction with the Trezor.
diff --git a/src/device_trezor/device_trezor_base.cpp b/src/device_trezor/device_trezor_base.cpp
index 1f9395622..66a00c213 100644
--- a/src/device_trezor/device_trezor_base.cpp
+++ b/src/device_trezor/device_trezor_base.cpp
@@ -109,6 +109,7 @@ namespace trezor {
       disconnect();
 
       // Enumerate all available devices
+      TREZOR_AUTO_LOCK_DEVICE();
       try {
         hw::trezor::t_transport_vect trans;
 
@@ -145,6 +146,7 @@ namespace trezor {
     }
 
     bool device_trezor_base::disconnect() {
+      TREZOR_AUTO_LOCK_DEVICE();
       m_device_state.clear();
       m_features.reset();
 
@@ -203,13 +205,13 @@ namespace trezor {
     /*  Helpers                                                                */
     /* ======================================================================= */
 
-    void device_trezor_base::require_connected(){
+    void device_trezor_base::require_connected() const {
       if (!m_transport){
         throw exc::NotConnectedException();
       }
     }
 
-    void device_trezor_base::require_initialized(){
+    void device_trezor_base::require_initialized() const {
       if (!m_features){
         throw exc::TrezorException("Device state not initialized");
       }
@@ -330,7 +332,7 @@ namespace trezor {
     /* ======================================================================= */
 
     bool device_trezor_base::ping() {
-      AUTO_LOCK_CMD();
+      TREZOR_AUTO_LOCK_CMD();
       if (!m_transport){
         MINFO("Ping failed, device not connected");
         return false;
@@ -364,7 +366,7 @@ namespace trezor {
 
     void device_trezor_base::device_state_reset()
     {
-      AUTO_LOCK_CMD();
+      TREZOR_AUTO_LOCK_CMD();
       device_state_reset_unsafe();
     }
 
@@ -373,6 +375,10 @@ namespace trezor {
   if (m_debug_callback) m_debug_callback->method(__VA_ARGS__); \
   if (m_callback) m_callback->method(__VA_ARGS__);             \
 }while(0)
+#define TREZOR_CALLBACK_GET(VAR, method, ...) do { \
+  if (m_debug_callback) VAR = m_debug_callback->method(__VA_ARGS__); \
+  if (m_callback) VAR = m_callback->method(__VA_ARGS__);             \
+}while(0)
 
     void device_trezor_base::setup_debug(){
       if (!m_debug){
@@ -392,6 +398,7 @@ namespace trezor {
 
 #else
 #define TREZOR_CALLBACK(method, ...) do { if (m_callback) m_callback->method(__VA_ARGS__); } while(0)
+#define TREZOR_CALLBACK_GET(VAR, method, ...) VAR = (m_callback ? m_callback->method(__VA_ARGS__) : boost::none)
 #endif
 
     void device_trezor_base::on_button_request(GenericMessage & resp, const messages::common::ButtonRequest * msg)
@@ -402,7 +409,7 @@ namespace trezor {
       messages::common::ButtonAck ack;
       write_raw(&ack);
 
-      TREZOR_CALLBACK(on_button_request);
+      TREZOR_CALLBACK(on_button_request, msg->code());
       resp = read_raw();
     }
 
@@ -411,13 +418,18 @@ namespace trezor {
       MDEBUG("on_pin_request");
       CHECK_AND_ASSERT_THROW_MES(msg, "Empty message");
 
-      epee::wipeable_string pin;
+      boost::optional<epee::wipeable_string> pin;
+      TREZOR_CALLBACK_GET(pin, on_pin_request);
 
-      TREZOR_CALLBACK(on_pin_request, pin);
+      if (!pin && m_pin){
+        pin = m_pin;
+      }
 
       // TODO: remove PIN from memory
       messages::common::PinMatrixAck m;
-      m.set_pin(pin.data(), pin.size());
+      if (pin) {
+        m.set_pin(pin.get().data(), pin.get().size());
+      }
       resp = call_raw(&m);
     }
 
@@ -425,14 +437,19 @@ namespace trezor {
     {
       CHECK_AND_ASSERT_THROW_MES(msg, "Empty message");
       MDEBUG("on_passhprase_request, on device: " << msg->on_device());
-      epee::wipeable_string passphrase;
+      boost::optional<epee::wipeable_string> passphrase;
+      TREZOR_CALLBACK_GET(passphrase, on_passphrase_request, msg->on_device());
 
-      TREZOR_CALLBACK(on_passphrase_request, msg->on_device(), passphrase);
+      if (!passphrase && m_passphrase){
+        passphrase = m_passphrase;
+      }
+
+      m_passphrase = boost::none;
 
       messages::common::PassphraseAck m;
-      if (!msg->on_device()){
+      if (!msg->on_device() && passphrase){
         // TODO: remove passphrase from memory
-        m.set_passphrase(passphrase.data(), passphrase.size());
+        m.set_passphrase(passphrase.get().data(), passphrase.get().size());
       }
 
       if (!m_device_state.empty()){
@@ -494,16 +511,16 @@ namespace trezor {
       m_debug_link->init(debug_transport);
     }
 
-    void trezor_debug_callback::on_button_request() {
+    void trezor_debug_callback::on_button_request(uint64_t code) {
       if (m_debug_link) m_debug_link->press_yes();
     }
 
-    void trezor_debug_callback::on_pin_request(epee::wipeable_string &pin) {
-
+    boost::optional<epee::wipeable_string> trezor_debug_callback::on_pin_request() {
+      return boost::none;
     }
 
-    void trezor_debug_callback::on_passphrase_request(bool on_device, epee::wipeable_string &passphrase) {
-
+    boost::optional<epee::wipeable_string> trezor_debug_callback::on_passphrase_request(bool on_device) {
+      return boost::none;
     }
 
     void trezor_debug_callback::on_passphrase_state_request(const std::string &state) {
diff --git a/src/device_trezor/device_trezor_base.hpp b/src/device_trezor/device_trezor_base.hpp
index 7b9d92b7e..d0535a137 100644
--- a/src/device_trezor/device_trezor_base.hpp
+++ b/src/device_trezor/device_trezor_base.hpp
@@ -47,14 +47,15 @@
 #endif
 
 //automatic lock one more level on device ensuring the current thread is allowed to use it
-#define AUTO_LOCK_CMD() \
+#define TREZOR_AUTO_LOCK_CMD() \
   /* lock both mutexes without deadlock*/ \
   boost::lock(device_locker, command_locker); \
   /* make sure both already-locked mutexes are unlocked at the end of scope */ \
   boost::lock_guard<boost::recursive_mutex> lock1(device_locker, boost::adopt_lock); \
   boost::lock_guard<boost::mutex> lock2(command_locker, boost::adopt_lock)
 
-  
+#define TREZOR_AUTO_LOCK_DEVICE() boost::lock_guard<boost::recursive_mutex> lock1_device(device_locker)
+
 namespace hw {
 namespace trezor {
 
@@ -62,14 +63,14 @@ namespace trezor {
   class device_trezor_base;
 
 #ifdef WITH_TREZOR_DEBUGGING
-    class trezor_debug_callback {
+    class trezor_debug_callback : public hw::i_device_callback {
     public:
       trezor_debug_callback()=default;
       explicit trezor_debug_callback(std::shared_ptr<Transport> & debug_transport);
 
-      void on_button_request();
-      void on_pin_request(epee::wipeable_string &pin);
-      void on_passphrase_request(bool on_device, epee::wipeable_string &passphrase);
+      void on_button_request(uint64_t code=0) override;
+      boost::optional<epee::wipeable_string> on_pin_request() override;
+      boost::optional<epee::wipeable_string> on_passphrase_request(bool on_device) override;
       void on_passphrase_state_request(const std::string &state);
       void on_disconnect();
     protected:
@@ -95,6 +96,8 @@ namespace trezor {
       std::vector<unsigned int> m_wallet_deriv_path;
       std::string m_device_state;  // returned after passphrase entry, session
       std::shared_ptr<messages::management::Features> m_features;  // features from the last device reset
+      boost::optional<epee::wipeable_string> m_pin;
+      boost::optional<epee::wipeable_string> m_passphrase;
 
       cryptonote::network_type network_type;
 
@@ -109,11 +112,11 @@ namespace trezor {
       // Internal methods
       //
 
-      void require_connected();
-      void require_initialized();
+      void require_connected() const;
+      void require_initialized() const;
       void call_ping_unsafe();
       void test_ping();
-      void device_state_reset_unsafe();
+      virtual void device_state_reset_unsafe();
       void ensure_derivation_path() noexcept;
 
       // Communication methods
@@ -265,6 +268,15 @@ namespace trezor {
 
     void set_derivation_path(const std::string &deriv_path) override;
 
+    virtual bool has_ki_live_refresh(void) const override { return false; }
+
+    virtual void set_pin(const epee::wipeable_string & pin) override {
+      m_pin = pin;
+    }
+    virtual void set_passphrase(const epee::wipeable_string & passphrase) override {
+      m_passphrase = passphrase;
+    }
+
     /* ======================================================================= */
     /*                              SETUP/TEARDOWN                             */
     /* ======================================================================= */
diff --git a/src/device_trezor/trezor/protocol.cpp b/src/device_trezor/trezor/protocol.cpp
index 13506a67f..b241987d3 100644
--- a/src/device_trezor/trezor/protocol.cpp
+++ b/src/device_trezor/trezor/protocol.cpp
@@ -33,6 +33,8 @@
 #include <utility>
 #include <boost/endian/conversion.hpp>
 #include <common/apply_permutation.h>
+#include <common/json_util.h>
+#include <crypto/hmac-keccak.h>
 #include <ringct/rctSigs.h>
 #include <ringct/bulletproofs.h>
 #include "cryptonote_config.h"
@@ -40,6 +42,37 @@
 #include <sodium/crypto_verify_32.h>
 #include <sodium/crypto_aead_chacha20poly1305.h>
 
+#define GET_FIELD_STRING(name, type, jtype) field_##name = std::string(json[#name].GetString(), json[#name].GetStringLength())
+#define GET_FIELD_OTHER(name, type, jtype) field_##name = static_cast<type>(json[#name].Get##jtype())
+
+#define GET_STRING_FROM_JSON(json, name, type, mandatory, def) \
+  GET_FIELD_FROM_JSON_EX(json, name, type, String, mandatory, def, GET_FIELD_STRING)
+
+#define GET_FIELD_FROM_JSON(json, name, type, jtype, mandatory, def) \
+  GET_FIELD_FROM_JSON_EX(json, name, type, jtype, mandatory, def, GET_FIELD_OTHER)
+
+#define GET_FIELD_FROM_JSON_EX(json, name, type, jtype, mandatory, def, VAL) \
+  type field_##name = static_cast<type>(def);                        \
+  bool field_##name##_found = false;                                 \
+  (void)field_##name##_found;                                        \
+  do if (json.HasMember(#name))                                      \
+  {                                                                  \
+    if (json[#name].Is##jtype())                                     \
+    {                                                                \
+      VAL(name, type, jtype);                                        \
+      field_##name##_found = true;                                   \
+    }                                                                \
+    else                                                             \
+    {                                                                \
+      throw std::invalid_argument("Field " #name " found in JSON, but not " #jtype); \
+    }                                                                \
+  }                                                                  \
+  else if (mandatory)                                                \
+  {                                                                  \
+    throw std::invalid_argument("Field " #name " not found in JSON");\
+  } while(0)
+
+
 namespace hw{
 namespace trezor{
 namespace protocol{
@@ -84,19 +117,22 @@ namespace protocol{
 namespace crypto {
 namespace chacha {
 
-  void decrypt(const void* ciphertext, size_t length, const uint8_t* key, const uint8_t* iv, char* plaintext){
-    if (length < 16){
-      throw std::invalid_argument("Ciphertext length too small");
-    }
+  void decrypt(const void* ciphertext, size_t length, const uint8_t* key, const uint8_t* iv, char* plaintext, size_t *plaintext_len){
+    CHECK_AND_ASSERT_THROW_MES(length >= TAG_SIZE, "Ciphertext length too small");
+    CHECK_AND_ASSERT_THROW_MES(!plaintext_len || *plaintext_len >= (length - TAG_SIZE), "Plaintext length too small");
 
-    unsigned long long int cip_len = length;
+    unsigned long long int res_len = plaintext_len ? *plaintext_len : length;
     auto r = crypto_aead_chacha20poly1305_ietf_decrypt(
-        reinterpret_cast<unsigned char *>(plaintext), &cip_len, nullptr,
+        reinterpret_cast<unsigned char *>(plaintext), &res_len, nullptr,
         static_cast<const unsigned char *>(ciphertext), length, nullptr, 0, iv, key);
 
     if (r != 0){
       throw exc::Poly1305TagInvalid();
     }
+
+    if (plaintext_len){
+      *plaintext_len = (size_t) res_len;
+    }
   }
 
 }
@@ -185,6 +221,49 @@ namespace ki {
     }
   }
 
+  void live_refresh_ack(const ::crypto::secret_key & view_key_priv,
+                        const ::crypto::public_key& out_key,
+                        const std::shared_ptr<messages::monero::MoneroLiveRefreshStepAck> & ack,
+                        ::cryptonote::keypair& in_ephemeral,
+                        ::crypto::key_image& ki)
+  {
+    std::string str_out_key(out_key.data, sizeof(out_key.data));
+    auto enc_key = protocol::tx::compute_enc_key(view_key_priv, str_out_key, ack->salt());
+
+    const size_t len_ciphertext = ack->key_image().size();  // IV || keys
+    CHECK_AND_ASSERT_THROW_MES(len_ciphertext > crypto::chacha::IV_SIZE + crypto::chacha::TAG_SIZE, "Invalid size");
+
+    size_t ki_len = len_ciphertext - crypto::chacha::IV_SIZE - crypto::chacha::TAG_SIZE;
+    std::unique_ptr<uint8_t[]> plaintext(new uint8_t[ki_len]);
+    uint8_t * buff = plaintext.get();
+
+    protocol::crypto::chacha::decrypt(
+        ack->key_image().data() + crypto::chacha::IV_SIZE,
+        len_ciphertext - crypto::chacha::IV_SIZE,
+        reinterpret_cast<const uint8_t *>(enc_key.data),
+        reinterpret_cast<const uint8_t *>(ack->key_image().data()),
+        reinterpret_cast<char *>(buff), &ki_len);
+
+    CHECK_AND_ASSERT_THROW_MES(ki_len == 3*32, "Invalid size");
+    ::crypto::signature sig{};
+    memcpy(ki.data, buff, 32);
+    memcpy(sig.c.data, buff + 32, 32);
+    memcpy(sig.r.data, buff + 64, 32);
+    in_ephemeral.pub = out_key;
+    in_ephemeral.sec = ::crypto::null_skey;
+
+    // Verification
+    std::vector<const ::crypto::public_key*> pkeys;
+    pkeys.push_back(&out_key);
+
+    CHECK_AND_ASSERT_THROW_MES(rct::scalarmultKey(rct::ki2rct(ki), rct::curveOrder()) == rct::identity(),
+                               "Key image out of validity domain: key image " << epee::string_tools::pod_to_hex(ki));
+
+    CHECK_AND_ASSERT_THROW_MES(::crypto::check_ring_signature((const ::crypto::hash&)ki, ki, pkeys, &sig),
+                               "Signature failed for key image " << epee::string_tools::pod_to_hex(ki)
+                                                                 << ", signature " + epee::string_tools::pod_to_hex(sig)
+                                                                 << ", pubkey " + epee::string_tools::pod_to_hex(*pkeys[0]));
+  }
 }
 
 // Cold transaction signing
@@ -198,6 +277,8 @@ namespace tx {
   void translate_dst_entry(MoneroTransactionDestinationEntry * dst, const cryptonote::tx_destination_entry * src){
     dst->set_amount(src->amount);
     dst->set_is_subaddress(src->is_subaddress);
+    dst->set_is_integrated(src->is_integrated);
+    dst->set_original(src->original);
     translate_address(dst->mutable_addr(), &(src->addr));
   }
 
@@ -267,9 +348,29 @@ namespace tx {
     return std::string(buff, offset);
   }
 
+  ::crypto::secret_key compute_enc_key(const ::crypto::secret_key & private_view_key, const std::string & aux, const std::string & salt)
+  {
+    uint8_t hash[32];
+    KECCAK_CTX ctx;
+    ::crypto::secret_key res;
+
+    keccak_init(&ctx);
+    keccak_update(&ctx, (const uint8_t *) private_view_key.data, sizeof(private_view_key.data));
+    if (!aux.empty()){
+      keccak_update(&ctx, (const uint8_t *) aux.data(), aux.size());
+    }
+    keccak_finish(&ctx, hash);
+    keccak(hash, sizeof(hash), hash, sizeof(hash));
+
+    hmac_keccak_hash(hash, (const uint8_t *) salt.data(), salt.size(), hash, sizeof(hash));
+    memcpy(res.data, hash, sizeof(hash));
+    memwipe(hash, sizeof(hash));
+    return res;
+  }
+
   TData::TData() {
-    in_memory = false;
     rsig_type = 0;
+    bp_version = 0;
     cur_input_idx = 0;
     cur_output_idx = 0;
     cur_batch_idx = 0;
@@ -283,6 +384,7 @@ namespace tx {
     m_tx_idx = tx_idx;
     m_ct.tx_data = cur_tx();
     m_multisig = false;
+    m_client_version = 1;
   }
 
   void Signer::extract_payment_id(){
@@ -392,8 +494,10 @@ namespace tx {
 
     m_ct.tx.version = 2;
     m_ct.tx.unlock_time = tx.unlock_time;
+    m_client_version = (m_aux_data->client_version ? m_aux_data->client_version.get() : 1);
 
     tsx_data.set_version(1);
+    tsx_data.set_client_version(client_version());
     tsx_data.set_unlock_time(tx.unlock_time);
     tsx_data.set_num_inputs(static_cast<google::protobuf::uint32>(tx.sources.size()));
     tsx_data.set_mixin(static_cast<google::protobuf::uint32>(tx.sources[0].outputs.size() - 1));
@@ -404,6 +508,10 @@ namespace tx {
     auto rsig_data = tsx_data.mutable_rsig_data();
     m_ct.rsig_type = get_rsig_type(tx.use_bulletproofs, tx.splitted_dsts.size());
     rsig_data->set_rsig_type(m_ct.rsig_type);
+    if (tx.use_bulletproofs){
+      m_ct.bp_version = (m_aux_data->bp_version ? m_aux_data->bp_version.get() : 1);
+      rsig_data->set_bp_version((uint32_t) m_ct.bp_version);
+    }
 
     generate_rsig_batch_sizes(m_ct.grouping_vct, m_ct.rsig_type, tx.splitted_dsts.size());
     assign_to_repeatable(rsig_data->mutable_grouping(), m_ct.grouping_vct.begin(), m_ct.grouping_vct.end());
@@ -437,7 +545,6 @@ namespace tx {
   }
 
   void Signer::step_init_ack(std::shared_ptr<const messages::monero::MoneroTransactionInitAck> ack){
-    m_ct.in_memory = false;
     if (ack->has_rsig_data()){
       m_ct.rsig_param = std::make_shared<MoneroRsigData>(ack->rsig_data());
     }
@@ -505,10 +612,6 @@ namespace tx {
   std::shared_ptr<messages::monero::MoneroTransactionInputsPermutationRequest> Signer::step_permutation(){
     sort_ki();
 
-    if (in_memory()){
-      return nullptr;
-    }
-
     auto res = std::make_shared<messages::monero::MoneroTransactionInputsPermutationRequest>();
     assign_to_repeatable(res->mutable_perm(), m_ct.source_permutation.begin(), m_ct.source_permutation.end());
 
@@ -516,15 +619,10 @@ namespace tx {
   }
 
   void Signer::step_permutation_ack(std::shared_ptr<const messages::monero::MoneroTransactionInputsPermutationAck> ack){
-    if (in_memory()){
-      return;
-    }
+
   }
 
   std::shared_ptr<messages::monero::MoneroTransactionInputViniRequest> Signer::step_set_vini_input(size_t idx){
-    if (in_memory()){
-      return nullptr;
-    }
     CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_data.sources.size(), "Invalid transaction index");
     CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx.vin.size(), "Invalid transaction index");
     CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_in_hmacs.size(), "Invalid transaction index");
@@ -536,7 +634,8 @@ namespace tx {
     translate_src_entry(res->mutable_src_entr(), &(tx.sources[idx]));
     res->set_vini(cryptonote::t_serializable_object_to_blob(vini));
     res->set_vini_hmac(m_ct.tx_in_hmacs[idx]);
-    if (!in_memory()) {
+
+    if (client_version() == 0) {
       CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs.size(), "Invalid transaction index");
       CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs_hmac.size(), "Invalid transaction index");
       res->set_pseudo_out(m_ct.pseudo_outs[idx]);
@@ -547,9 +646,7 @@ namespace tx {
   }
 
   void Signer::step_set_vini_input_ack(std::shared_ptr<const messages::monero::MoneroTransactionInputViniAck> ack){
-    if (in_memory()){
-      return;
-    }
+
   }
 
   std::shared_ptr<messages::monero::MoneroTransactionAllInputsSetRequest> Signer::step_all_inputs_set(){
@@ -557,34 +654,37 @@ namespace tx {
   }
 
   void Signer::step_all_inputs_set_ack(std::shared_ptr<const messages::monero::MoneroTransactionAllInputsSetAck> ack){
-    if (is_offloading()){
-      // If offloading, expect rsig configuration.
-      if (!ack->has_rsig_data()){
-        throw exc::ProtocolException("Rsig offloading requires rsig param");
-      }
+    if (client_version() > 0 || !is_offloading()){
+      return;
+    }
 
-      auto & rsig_data = ack->rsig_data();
-      if (!rsig_data.has_mask()){
-        throw exc::ProtocolException("Gamma masks not present in offloaded version");
-      }
+    // If offloading, expect rsig configuration.
+    if (!ack->has_rsig_data()){
+      throw exc::ProtocolException("Rsig offloading requires rsig param");
+    }
 
-      auto & mask = rsig_data.mask();
-      if (mask.size() != 32 * num_outputs()){
-        throw exc::ProtocolException("Invalid number of gamma masks");
-      }
+    auto & rsig_data = ack->rsig_data();
+    if (!rsig_data.has_mask()){
+      throw exc::ProtocolException("Gamma masks not present in offloaded version");
+    }
 
-      m_ct.rsig_gamma.reserve(num_outputs());
-      for(size_t c=0; c < num_outputs(); ++c){
-        rct::key cmask{};
-        memcpy(cmask.bytes, mask.data() + c * 32, 32);
-        m_ct.rsig_gamma.emplace_back(cmask);
-      }
+    auto & mask = rsig_data.mask();
+    if (mask.size() != 32 * num_outputs()){
+      throw exc::ProtocolException("Invalid number of gamma masks");
+    }
+
+    m_ct.rsig_gamma.reserve(num_outputs());
+    for(size_t c=0; c < num_outputs(); ++c){
+      rct::key cmask{};
+      memcpy(cmask.bytes, mask.data() + c * 32, 32);
+      m_ct.rsig_gamma.emplace_back(cmask);
     }
   }
 
   std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> Signer::step_set_output(size_t idx){
     CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_data.splitted_dsts.size(), "Invalid transaction index");
     CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_out_entr_hmacs.size(), "Invalid transaction index");
+    CHECK_AND_ASSERT_THROW_MES(is_req_bulletproof(), "Borromean rsig not supported");
 
     m_ct.cur_output_idx = idx;
     m_ct.cur_output_in_batch_idx += 1;   // assumes sequential call to step_set_output()
@@ -595,48 +695,11 @@ namespace tx {
     res->set_dst_entr_hmac(m_ct.tx_out_entr_hmacs[idx]);
 
     // Range sig offloading to the host
-    if (!is_offloading()) {
-      return res;
-    }
-
-    CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
-    if (m_ct.grouping_vct[m_ct.cur_batch_idx] > m_ct.cur_output_in_batch_idx) {
-      return res;
-    }
-
-    auto rsig_data = res->mutable_rsig_data();
-    auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
-
-    if (!is_req_bulletproof()){
-      if (batch_size > 1){
-        throw std::invalid_argument("Borromean cannot batch outputs");
-      }
-
-      CHECK_AND_ASSERT_THROW_MES(idx < m_ct.rsig_gamma.size(), "Invalid gamma index");
-      rct::key C{}, mask = m_ct.rsig_gamma[idx];
-      auto genRsig = rct::proveRange(C, mask, cur_dst.amount);  // TODO: rsig with given mask
-      auto serRsig = cn_serialize(genRsig);
-      m_ct.tx_out_rsigs.emplace_back(genRsig);
-      rsig_data->set_rsig(serRsig);
-
-    } else {
-      std::vector<uint64_t> amounts;
-      rct::keyV masks;
-      CHECK_AND_ASSERT_THROW_MES(idx + 1 >= batch_size, "Invalid index for batching");
-
-      for(size_t i = 0; i < batch_size; ++i){
-        const size_t bidx = 1 + idx - batch_size + i;
-        CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_data.splitted_dsts.size(), "Invalid gamma index");
-        CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.rsig_gamma.size(), "Invalid gamma index");
-
-        amounts.push_back(m_ct.tx_data.splitted_dsts[bidx].amount);
-        masks.push_back(m_ct.rsig_gamma[bidx]);
-      }
-
-      auto bp = bulletproof_PROVE(amounts, masks);
-      auto serRsig = cn_serialize(bp);
-      m_ct.tx_out_rsigs.emplace_back(bp);
-      rsig_data->set_rsig(serRsig);
+    // ClientV0 sends offloaded BP with the last message in the batch.
+    // ClientV1 needs additional message after the last message in the batch as BP uses deterministic masks.
+    if (client_version() == 0 && is_offloading() && should_compute_bp_now()) {
+      auto rsig_data = res->mutable_rsig_data();
+      compute_bproof(*rsig_data);
     }
 
     return res;
@@ -644,7 +707,6 @@ namespace tx {
 
   void Signer::step_set_output_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack){
     cryptonote::tx_out tx_out;
-    rct::rangeSig range_sig{};
     rct::Bulletproof bproof{};
     rct::ctkey out_pk{};
     rct::ecdhTuple ecdh{};
@@ -658,12 +720,12 @@ namespace tx {
       if (rsig_data.has_rsig() && !rsig_data.rsig().empty()){
         has_rsig = true;
         rsig_buff = rsig_data.rsig();
+      }
 
-      } else if (rsig_data.rsig_parts_size() > 0){
-        has_rsig = true;
-        for (const auto &it : rsig_data.rsig_parts()) {
-          rsig_buff += it;
-        }
+      if (client_version() >= 1 && rsig_data.has_mask()){
+        rct::key cmask{};
+        string_to_key(cmask, rsig_data.mask());
+        m_ct.rsig_gamma.emplace_back(cmask);
       }
     }
 
@@ -675,12 +737,13 @@ namespace tx {
       throw exc::ProtocolException("Cannot deserialize out_pk");
     }
 
-    if (!cn_deserialize(ack->ecdh_info(), ecdh)){
-      throw exc::ProtocolException("Cannot deserialize ecdhtuple");
-    }
-
-    if (has_rsig && !is_req_bulletproof() && !cn_deserialize(rsig_buff, range_sig)){
-      throw exc::ProtocolException("Cannot deserialize rangesig");
+    if (m_ct.bp_version <= 1) {
+      if (!cn_deserialize(ack->ecdh_info(), ecdh)){
+        throw exc::ProtocolException("Cannot deserialize ecdhtuple");
+      }
+    } else {
+      CHECK_AND_ASSERT_THROW_MES(8 == ack->ecdh_info().size(), "Invalid ECDH.amount size");
+      memcpy(ecdh.amount.bytes, ack->ecdh_info().data(), 8);
     }
 
     if (has_rsig && is_req_bulletproof() && !cn_deserialize(rsig_buff, bproof)){
@@ -692,35 +755,77 @@ namespace tx {
     m_ct.tx_out_pk.emplace_back(out_pk);
     m_ct.tx_out_ecdh.emplace_back(ecdh);
 
-    if (!has_rsig){
+    // ClientV0, if no rsig was generated on Trezor, do not continue.
+    // ClientV1+ generates BP after all masks in the current batch are generated
+    if (!has_rsig || (client_version() >= 1 && is_offloading())){
       return;
     }
 
-    if (is_req_bulletproof()){
-      CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
-      auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
-      for (size_t i = 0; i < batch_size; ++i){
-        const size_t bidx = 1 + m_ct.cur_output_idx - batch_size + i;
-        CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_out_pk.size(), "Invalid out index");
+    process_bproof(bproof);
+    m_ct.cur_batch_idx += 1;
+    m_ct.cur_output_in_batch_idx = 0;
+  }
 
-        rct::key commitment = m_ct.tx_out_pk[bidx].mask;
-        commitment = rct::scalarmultKey(commitment, rct::INV_EIGHT);
-        bproof.V.push_back(commitment);
-      }
+  bool Signer::should_compute_bp_now() const {
+    CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
+    return m_ct.grouping_vct[m_ct.cur_batch_idx] <= m_ct.cur_output_in_batch_idx;
+  }
 
-      m_ct.tx_out_rsigs.emplace_back(bproof);
-      if (!rct::bulletproof_VERIFY(boost::get<rct::Bulletproof>(m_ct.tx_out_rsigs.back()))) {
-        throw exc::ProtocolException("Returned range signature is invalid");
-      }
+  void Signer::compute_bproof(messages::monero::MoneroTransactionRsigData & rsig_data){
+    auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
+    std::vector<uint64_t> amounts;
+    rct::keyV masks;
+    CHECK_AND_ASSERT_THROW_MES(m_ct.cur_output_idx + 1 >= batch_size, "Invalid index for batching");
 
-    } else {
-      m_ct.tx_out_rsigs.emplace_back(range_sig);
+    for(size_t i = 0; i < batch_size; ++i){
+      const size_t bidx = 1 + m_ct.cur_output_idx - batch_size + i;
+      CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_data.splitted_dsts.size(), "Invalid gamma index");
+      CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.rsig_gamma.size(), "Invalid gamma index");
 
-      if (!rct::verRange(out_pk.mask, boost::get<rct::rangeSig>(m_ct.tx_out_rsigs.back()))) {
-        throw exc::ProtocolException("Returned range signature is invalid");
-      }
+      amounts.push_back(m_ct.tx_data.splitted_dsts[bidx].amount);
+      masks.push_back(m_ct.rsig_gamma[bidx]);
     }
 
+    auto bp = bulletproof_PROVE(amounts, masks);
+    auto serRsig = cn_serialize(bp);
+    m_ct.tx_out_rsigs.emplace_back(bp);
+    rsig_data.set_rsig(serRsig);
+  }
+
+  void Signer::process_bproof(rct::Bulletproof & bproof){
+    CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
+    auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
+    for (size_t i = 0; i < batch_size; ++i){
+      const size_t bidx = 1 + m_ct.cur_output_idx - batch_size + i;
+      CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_out_pk.size(), "Invalid out index");
+
+      rct::key commitment = m_ct.tx_out_pk[bidx].mask;
+      commitment = rct::scalarmultKey(commitment, rct::INV_EIGHT);
+      bproof.V.push_back(commitment);
+    }
+
+    m_ct.tx_out_rsigs.emplace_back(bproof);
+    if (!rct::bulletproof_VERIFY(boost::get<rct::Bulletproof>(m_ct.tx_out_rsigs.back()))) {
+      throw exc::ProtocolException("Returned range signature is invalid");
+    }
+  }
+
+  std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> Signer::step_rsig(size_t idx){
+    if (client_version() == 0 || !is_offloading() || !should_compute_bp_now()){
+      return nullptr;
+    }
+
+    auto res = std::make_shared<messages::monero::MoneroTransactionSetOutputRequest>();
+    auto & cur_dst = m_ct.tx_data.splitted_dsts[idx];
+    translate_dst_entry(res->mutable_dst_entr(), &cur_dst);
+    res->set_dst_entr_hmac(m_ct.tx_out_entr_hmacs[idx]);
+
+    compute_bproof(*(res->mutable_rsig_data()));
+    res->set_is_offloaded_bp(true);
+    return res;
+  }
+
+  void Signer::step_set_rsig_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack){
     m_ct.cur_batch_idx += 1;
     m_ct.cur_output_in_batch_idx = 0;
   }
@@ -814,12 +919,11 @@ namespace tx {
     res->set_vini_hmac(m_ct.tx_in_hmacs[idx]);
     res->set_pseudo_out_alpha(m_ct.alphas[idx]);
     res->set_spend_key(m_ct.spend_encs[idx]);
-    if (!in_memory()){
-      CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs.size(), "Invalid transaction index");
-      CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs_hmac.size(), "Invalid transaction index");
-      res->set_pseudo_out(m_ct.pseudo_outs[idx]);
-      res->set_pseudo_out_hmac(m_ct.pseudo_outs_hmac[idx]);
-    }
+
+    CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs.size(), "Invalid transaction index");
+    CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs_hmac.size(), "Invalid transaction index");
+    res->set_pseudo_out(m_ct.pseudo_outs[idx]);
+    res->set_pseudo_out_hmac(m_ct.pseudo_outs_hmac[idx]);
     return res;
   }
 
@@ -829,6 +933,19 @@ namespace tx {
       throw exc::ProtocolException("Cannot deserialize mg[i]");
     }
 
+    // Sync updated pseudo_outputs, client_version>=1, HF10+
+    if (client_version() >= 1 && ack->has_pseudo_out()){
+      CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.pseudo_outs.size(), "Invalid pseudo-out index");
+      m_ct.pseudo_outs[m_ct.cur_input_idx] = ack->pseudo_out();
+      if (is_bulletproof()){
+        CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.rv->p.pseudoOuts.size(), "Invalid pseudo-out index");
+        string_to_key(m_ct.rv->p.pseudoOuts[m_ct.cur_input_idx], ack->pseudo_out());
+      } else {
+        CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.rv->pseudoOuts.size(), "Invalid pseudo-out index");
+        string_to_key(m_ct.rv->pseudoOuts[m_ct.cur_input_idx], ack->pseudo_out());
+      }
+    }
+
     m_ct.rv->p.MGs.push_back(mg);
   }
 
@@ -841,14 +958,14 @@ namespace tx {
     if (m_multisig){
       auto & cout_key = ack->cout_key();
       for(auto & cur : m_ct.couts){
-        if (cur.size() != 12 + 32){
+        if (cur.size() != crypto::chacha::IV_SIZE + 32){
           throw std::invalid_argument("Encrypted cout has invalid length");
         }
 
         char buff[32];
         auto data = cur.data();
 
-        crypto::chacha::decrypt(data + 12, 32, reinterpret_cast<const uint8_t *>(cout_key.data()), reinterpret_cast<const uint8_t *>(data), buff);
+        crypto::chacha::decrypt(data + crypto::chacha::IV_SIZE, 32, reinterpret_cast<const uint8_t *>(cout_key.data()), reinterpret_cast<const uint8_t *>(data), buff);
         m_ct.couts_dec.emplace_back(buff, 32);
       }
     }
@@ -887,6 +1004,82 @@ namespace tx {
     return sb.GetString();
   }
 
+  void load_tx_key_data(hw::device_cold::tx_key_data_t & res, const std::string & data)
+  {
+    rapidjson::Document json;
+
+    // The contents should be JSON if the wallet follows the new format.
+    if (json.Parse(data.c_str()).HasParseError())
+    {
+      throw std::invalid_argument("Data parsing error");
+    }
+    else if(!json.IsObject())
+    {
+      throw std::invalid_argument("Data parsing error - not an object");
+    }
+
+    GET_FIELD_FROM_JSON(json, version, int, Int, true, -1);
+    GET_STRING_FROM_JSON(json, salt1, std::string, true, std::string());
+    GET_STRING_FROM_JSON(json, salt2, std::string, true, std::string());
+    GET_STRING_FROM_JSON(json, enc_keys, std::string, true, std::string());
+    GET_STRING_FROM_JSON(json, tx_prefix_hash, std::string, false, std::string());
+
+    if (field_version != 1)
+    {
+      throw std::invalid_argument("Unknown version");
+    }
+
+    res.salt1 = field_salt1;
+    res.salt2 = field_salt2;
+    res.tx_enc_keys = field_enc_keys;
+    res.tx_prefix_hash = field_tx_prefix_hash;
+  }
+
+  std::shared_ptr<messages::monero::MoneroGetTxKeyRequest> get_tx_key(
+      const hw::device_cold::tx_key_data_t & tx_data)
+  {
+    auto req = std::make_shared<messages::monero::MoneroGetTxKeyRequest>();
+    req->set_salt1(tx_data.salt1);
+    req->set_salt2(tx_data.salt2);
+    req->set_tx_enc_keys(tx_data.tx_enc_keys);
+    req->set_tx_prefix_hash(tx_data.tx_prefix_hash);
+    req->set_reason(0);
+
+    return req;
+  }
+
+  void get_tx_key_ack(
+      std::vector<::crypto::secret_key> & tx_keys,
+      const std::string & tx_prefix_hash,
+      const ::crypto::secret_key & view_key_priv,
+      std::shared_ptr<const messages::monero::MoneroGetTxKeyAck> ack
+  )
+  {
+    auto enc_key = protocol::tx::compute_enc_key(view_key_priv, tx_prefix_hash, ack->salt());
+    auto & encrypted_keys = ack->has_tx_derivations() ? ack->tx_derivations() : ack->tx_keys();
+
+    const size_t len_ciphertext = encrypted_keys.size();  // IV || keys || TAG
+    CHECK_AND_ASSERT_THROW_MES(len_ciphertext > crypto::chacha::IV_SIZE + crypto::chacha::TAG_SIZE, "Invalid size");
+
+    size_t keys_len = len_ciphertext - crypto::chacha::IV_SIZE - crypto::chacha::TAG_SIZE;
+    std::unique_ptr<uint8_t[]> plaintext(new uint8_t[keys_len]);
+
+    protocol::crypto::chacha::decrypt(
+        encrypted_keys.data() + crypto::chacha::IV_SIZE,
+        len_ciphertext - crypto::chacha::IV_SIZE,
+        reinterpret_cast<const uint8_t *>(enc_key.data),
+        reinterpret_cast<const uint8_t *>(encrypted_keys.data()),
+        reinterpret_cast<char *>(plaintext.get()), &keys_len);
+
+    CHECK_AND_ASSERT_THROW_MES(keys_len % 32 == 0, "Invalid size");
+    tx_keys.resize(keys_len / 32);
+
+    for(unsigned i = 0; i < keys_len / 32; ++i)
+    {
+      memcpy(tx_keys[i].data, plaintext.get() + 32 * i, 32);
+    }
+    memwipe(plaintext.get(), keys_len);
+  }
 
 }
 }
diff --git a/src/device_trezor/trezor/protocol.hpp b/src/device_trezor/trezor/protocol.hpp
index ce0361640..42d523dad 100644
--- a/src/device_trezor/trezor/protocol.hpp
+++ b/src/device_trezor/trezor/protocol.hpp
@@ -92,11 +92,14 @@ namespace protocol{
 // Crypto / encryption
 namespace crypto {
 namespace chacha {
+  // Constants as defined in RFC 7539.
+  const unsigned IV_SIZE = 12;
+  const unsigned TAG_SIZE = 16;  // crypto_aead_chacha20poly1305_IETF_ABYTES;
 
   /**
    * Chacha20Poly1305 decryption with tag verification. RFC 7539.
    */
-  void decrypt(const void* ciphertext, size_t length, const uint8_t* key, const uint8_t* iv, char* plaintext);
+  void decrypt(const void* ciphertext, size_t length, const uint8_t* key, const uint8_t* iv, char* plaintext, size_t *plaintext_len=nullptr);
 
 }
 }
@@ -129,6 +132,14 @@ namespace ki {
                            const std::vector<tools::wallet2::transfer_details> & transfers,
                            std::shared_ptr<messages::monero::MoneroKeyImageExportInitRequest> & req);
 
+  /**
+   * Processes Live refresh step response, parses KI, checks the signature
+   */
+  void live_refresh_ack(const ::crypto::secret_key & view_key_priv,
+                        const ::crypto::public_key& out_key,
+                        const std::shared_ptr<messages::monero::MoneroLiveRefreshStepAck> & ack,
+                        ::cryptonote::keypair& in_ephemeral,
+                        ::crypto::key_image& ki);
 }
 
 // Cold transaction signing
@@ -153,6 +164,7 @@ namespace tx {
   std::string hash_addr(const MoneroAccountPublicAddress * addr, boost::optional<uint64_t> amount = boost::none, boost::optional<bool> is_subaddr = boost::none);
   std::string hash_addr(const std::string & spend_key, const std::string & view_key, boost::optional<uint64_t> amount = boost::none, boost::optional<bool> is_subaddr = boost::none);
   std::string hash_addr(const ::crypto::public_key * spend_key, const ::crypto::public_key * view_key, boost::optional<uint64_t> amount = boost::none, boost::optional<bool> is_subaddr = boost::none);
+  ::crypto::secret_key compute_enc_key(const ::crypto::secret_key & private_view_key, const std::string & aux, const std::string & salt);
 
   typedef boost::variant<rct::rangeSig, rct::Bulletproof> rsig_v;
 
@@ -164,8 +176,8 @@ namespace tx {
     TsxData tsx_data;
     tx_construction_data tx_data;
     cryptonote::transaction tx;
-    bool in_memory;
     unsigned rsig_type;
+    int bp_version;
     std::vector<uint64_t> grouping_vct;
     std::shared_ptr<MoneroRsigData> rsig_param;
     size_t cur_input_idx;
@@ -206,6 +218,7 @@ namespace tx {
     const unsigned_tx_set * m_unsigned_tx;
     hw::tx_aux_data * m_aux_data;
 
+    unsigned m_client_version;
     bool m_multisig;
 
     const tx_construction_data & cur_tx(){
@@ -215,6 +228,9 @@ namespace tx {
 
     void extract_payment_id();
     void compute_integrated_indices(TsxData * tsx_data);
+    bool should_compute_bp_now() const;
+    void compute_bproof(messages::monero::MoneroTransactionRsigData & rsig_data);
+    void process_bproof(rct::Bulletproof & bproof);
 
   public:
     Signer(wallet_shim * wallet2, const unsigned_tx_set * unsigned_tx, size_t tx_idx = 0, hw::tx_aux_data * aux_data = nullptr);
@@ -238,6 +254,9 @@ namespace tx {
     std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> step_set_output(size_t idx);
     void step_set_output_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack);
 
+    std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> step_rsig(size_t idx);
+    void step_set_rsig_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack);
+
     std::shared_ptr<messages::monero::MoneroTransactionAllOutSetRequest> step_all_outs_set();
     void step_all_outs_set_ack(std::shared_ptr<const messages::monero::MoneroTransactionAllOutSetAck> ack, hw::device &hwdev);
 
@@ -249,8 +268,8 @@ namespace tx {
 
     std::string store_tx_aux_info();
 
-    bool in_memory() const {
-      return m_ct.in_memory;
+    unsigned client_version() const {
+      return m_client_version;
     }
 
     bool is_simple() const {
@@ -290,6 +309,18 @@ namespace tx {
     }
   };
 
+  // TX Key decryption
+  void load_tx_key_data(hw::device_cold::tx_key_data_t & res, const std::string & data);
+
+  std::shared_ptr<messages::monero::MoneroGetTxKeyRequest> get_tx_key(
+      const hw::device_cold::tx_key_data_t & tx_data);
+
+  void get_tx_key_ack(
+      std::vector<::crypto::secret_key> & tx_keys,
+      const std::string & tx_prefix_hash,
+      const ::crypto::secret_key & view_key_priv,
+      std::shared_ptr<const messages::monero::MoneroGetTxKeyAck> ack
+  );
 }
 
 }
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 8c0b300ad..218c1ea56 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -2049,7 +2049,7 @@ bool simple_wallet::cold_sign_tx(const std::vector<tools::wallet2::pending_tx>&
   m_wallet->cold_tx_aux_import(exported_txs.ptx, tx_aux);
 
   // import key images
-  return m_wallet->import_key_images(exported_txs.key_images);
+  return m_wallet->import_key_images(exported_txs, 0, true);
 }
 
 bool simple_wallet::set_always_confirm_transfers(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
@@ -4686,12 +4686,12 @@ boost::optional<epee::wipeable_string> simple_wallet::on_get_password(const char
   return pwd_container->password();
 }
 //----------------------------------------------------------------------------------------------------
-void simple_wallet::on_button_request()
+void simple_wallet::on_device_button_request(uint64_t code)
 {
   message_writer(console_color_white, false) << tr("Device requires attention");
 }
 //----------------------------------------------------------------------------------------------------
-void simple_wallet::on_pin_request(epee::wipeable_string & pin)
+boost::optional<epee::wipeable_string> simple_wallet::on_device_pin_request()
 {
 #ifdef HAVE_READLINE
   rdln::suspend_readline pause_readline;
@@ -4699,14 +4699,14 @@ void simple_wallet::on_pin_request(epee::wipeable_string & pin)
   std::string msg = tr("Enter device PIN");
   auto pwd_container = tools::password_container::prompt(false, msg.c_str());
   THROW_WALLET_EXCEPTION_IF(!pwd_container, tools::error::password_entry_failed, tr("Failed to read device PIN"));
-  pin = pwd_container->password();
+  return pwd_container->password();
 }
 //----------------------------------------------------------------------------------------------------
-void simple_wallet::on_passphrase_request(bool on_device, epee::wipeable_string & passphrase)
+boost::optional<epee::wipeable_string> simple_wallet::on_device_passphrase_request(bool on_device)
 {
   if (on_device){
     message_writer(console_color_white, true) << tr("Please enter the device passphrase on the device");
-    return;
+    return boost::none;
   }
 
 #ifdef HAVE_READLINE
@@ -4715,13 +4715,13 @@ void simple_wallet::on_passphrase_request(bool on_device, epee::wipeable_string
   std::string msg = tr("Enter device passphrase");
   auto pwd_container = tools::password_container::prompt(false, msg.c_str());
   THROW_WALLET_EXCEPTION_IF(!pwd_container, tools::error::password_entry_failed, tr("Failed to read device passphrase"));
-  passphrase = pwd_container->password();
+  return pwd_container->password();
 }
 //----------------------------------------------------------------------------------------------------
 void simple_wallet::on_refresh_finished(uint64_t start_height, uint64_t fetched_blocks, bool is_init, bool received_money)
 {
   // Key image sync after the first refresh
-  if (!m_wallet->get_account().get_device().has_tx_cold_sign()) {
+  if (!m_wallet->get_account().get_device().has_tx_cold_sign() || m_wallet->get_account().get_device().has_ki_live_refresh()) {
     return;
   }
 
@@ -6752,7 +6752,7 @@ bool simple_wallet::get_tx_key(const std::vector<std::string> &args_)
 {
   std::vector<std::string> local_args = args_;
 
-  if (m_wallet->key_on_device())
+  if (m_wallet->key_on_device() && m_wallet->get_account().get_device().get_type() != hw::device::TREZOR)
   {
     fail_msg_writer() << tr("command not supported by HW wallet");
     return true;
@@ -6773,7 +6773,9 @@ bool simple_wallet::get_tx_key(const std::vector<std::string> &args_)
 
   crypto::secret_key tx_key;
   std::vector<crypto::secret_key> additional_tx_keys;
-  if (m_wallet->get_tx_key(txid, tx_key, additional_tx_keys))
+
+  bool found_tx_key = m_wallet->get_tx_key(txid, tx_key, additional_tx_keys);
+  if (found_tx_key)
   {
     ostringstream oss;
     oss << epee::string_tools::pod_to_hex(tx_key);
@@ -6849,7 +6851,7 @@ bool simple_wallet::set_tx_key(const std::vector<std::string> &args_)
 //----------------------------------------------------------------------------------------------------
 bool simple_wallet::get_tx_proof(const std::vector<std::string> &args)
 {
-  if (m_wallet->key_on_device())
+  if (m_wallet->key_on_device() && m_wallet->get_account().get_device().get_type() != hw::device::TREZOR)
   {
     fail_msg_writer() << tr("command not supported by HW wallet");
     return true;
diff --git a/src/simplewallet/simplewallet.h b/src/simplewallet/simplewallet.h
index c3dc16d96..17c14c7f1 100644
--- a/src/simplewallet/simplewallet.h
+++ b/src/simplewallet/simplewallet.h
@@ -300,9 +300,9 @@ namespace cryptonote
     virtual void on_money_spent(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& in_tx, uint64_t amount, const cryptonote::transaction& spend_tx, const cryptonote::subaddress_index& subaddr_index);
     virtual void on_skip_transaction(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& tx);
     virtual boost::optional<epee::wipeable_string> on_get_password(const char *reason);
-    virtual void on_button_request();
-    virtual void on_pin_request(epee::wipeable_string & pin);
-    virtual void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase);
+    virtual void on_device_button_request(uint64_t code);
+    virtual boost::optional<epee::wipeable_string> on_device_pin_request();
+    virtual boost::optional<epee::wipeable_string> on_device_passphrase_request(bool on_device);
     //----------------------------------------------------------
 
     friend class refresh_progress_reporter_t;
diff --git a/src/wallet/api/pending_transaction.cpp b/src/wallet/api/pending_transaction.cpp
index 913e3156f..4d602320f 100644
--- a/src/wallet/api/pending_transaction.cpp
+++ b/src/wallet/api/pending_transaction.cpp
@@ -109,6 +109,23 @@ bool PendingTransactionImpl::commit(const std::string &filename, bool overwrite)
         }
 
         m_wallet.pauseRefresh();
+
+        const bool tx_cold_signed = m_wallet.m_wallet->get_account().get_device().has_tx_cold_sign();
+        if (tx_cold_signed){
+          std::unordered_set<size_t> selected_transfers;
+          for(const tools::wallet2::pending_tx & ptx : m_pending_tx){
+            for(size_t s : ptx.selected_transfers){
+              selected_transfers.insert(s);
+            }
+          }
+
+          m_wallet.m_wallet->cold_tx_aux_import(m_pending_tx, m_tx_device_aux);
+          bool r = m_wallet.m_wallet->import_key_images(m_key_images, 0, selected_transfers);
+          if (!r){
+            throw runtime_error("Cold sign transaction submit failed - key image sync fail");
+          }
+        }
+
         while (!m_pending_tx.empty()) {
             auto & ptx = m_pending_tx.back();
             m_wallet.m_wallet->commit_tx(ptx);
diff --git a/src/wallet/api/pending_transaction.h b/src/wallet/api/pending_transaction.h
index 50b9f07ef..4f3b8a177 100644
--- a/src/wallet/api/pending_transaction.h
+++ b/src/wallet/api/pending_transaction.h
@@ -67,6 +67,8 @@ private:
     std::string m_errorString;
     std::vector<tools::wallet2::pending_tx> m_pending_tx;
     std::unordered_set<crypto::public_key> m_signers;
+    std::vector<std::string> m_tx_device_aux;
+    std::vector<crypto::key_image> m_key_images;
 };
 
 
diff --git a/src/wallet/api/wallet.cpp b/src/wallet/api/wallet.cpp
index 44cd67657..8f9e571fe 100644
--- a/src/wallet/api/wallet.cpp
+++ b/src/wallet/api/wallet.cpp
@@ -242,6 +242,42 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
       }
     }
 
+    virtual void on_device_button_request(uint64_t code)
+    {
+      if (m_listener) {
+        m_listener->onDeviceButtonRequest(code);
+      }
+    }
+
+    virtual boost::optional<epee::wipeable_string> on_device_pin_request()
+    {
+      if (m_listener) {
+        auto pin = m_listener->onDevicePinRequest();
+        if (pin){
+          return boost::make_optional(epee::wipeable_string((*pin).data(), (*pin).size()));
+        }
+      }
+      return boost::none;
+    }
+
+    virtual boost::optional<epee::wipeable_string> on_device_passphrase_request(bool on_device)
+    {
+      if (m_listener) {
+        auto passphrase = m_listener->onDevicePassphraseRequest(on_device);
+        if (!on_device && passphrase) {
+          return boost::make_optional(epee::wipeable_string((*passphrase).data(), (*passphrase).size()));
+        }
+      }
+      return boost::none;
+    }
+
+    virtual void on_device_progress(const hw::device_progress & event)
+    {
+      if (m_listener) {
+        m_listener->onDeviceProgress(DeviceProgress(event.progress(), event.indeterminate()));
+      }
+    }
+
     WalletListener * m_listener;
     WalletImpl     * m_wallet;
 };
@@ -785,6 +821,28 @@ bool WalletImpl::setPassword(const std::string &password)
     return status() == Status_Ok;
 }
 
+bool WalletImpl::setDevicePin(const std::string &pin)
+{
+    clearStatus();
+    try {
+        m_wallet->get_account().get_device().set_pin(epee::wipeable_string(pin.data(), pin.size()));
+    } catch (const std::exception &e) {
+        setStatusError(e.what());
+    }
+    return status() == Status_Ok;
+}
+
+bool WalletImpl::setDevicePassphrase(const std::string &passphrase)
+{
+    clearStatus();
+    try {
+        m_wallet->get_account().get_device().set_passphrase(epee::wipeable_string(passphrase.data(), passphrase.size()));
+    } catch (const std::exception &e) {
+        setStatusError(e.what());
+    }
+    return status() == Status_Ok;
+}
+
 std::string WalletImpl::address(uint32_t accountIndex, uint32_t addressIndex) const
 {
     return m_wallet->get_subaddress_as_str({accountIndex, addressIndex});
@@ -1428,6 +1486,8 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
                                                                           extra, subaddr_account, subaddr_indices);
             }
 
+            pendingTxPostProcess(transaction);
+
             if (multisig().isMultisig) {
                 transaction->m_signers = m_wallet->make_multisig_tx_set(transaction->m_pending_tx).m_signers;
             }
@@ -1511,6 +1571,7 @@ PendingTransaction *WalletImpl::createSweepUnmixableTransaction()
     do {
         try {
             transaction->m_pending_tx = m_wallet->create_unmixable_sweep_transactions();
+            pendingTxPostProcess(transaction);
 
         } catch (const tools::error::daemon_busy&) {
             // TODO: make it translatable with "tr"?
@@ -2093,6 +2154,21 @@ bool WalletImpl::isNewWallet() const
     return !(blockChainHeight() > 1 || m_recoveringFromSeed || m_recoveringFromDevice || m_rebuildWalletCache) && !watchOnly();
 }
 
+void WalletImpl::pendingTxPostProcess(PendingTransactionImpl * pending)
+{
+  // If the device being used is HW device with cold signing protocol, cold sign then.
+  if (!m_wallet->get_account().get_device().has_tx_cold_sign()){
+    return;
+  }
+
+  tools::wallet2::signed_tx_set exported_txs;
+  std::vector<cryptonote::address_parse_info> dsts_info;
+
+  m_wallet->cold_sign_tx(pending->m_pending_tx, exported_txs, dsts_info, pending->m_tx_device_aux);
+  pending->m_key_images = exported_txs.key_images;
+  pending->m_pending_tx = exported_txs.ptx;
+}
+
 bool WalletImpl::doInit(const string &daemon_address, uint64_t upper_transaction_size_limit, bool ssl)
 {
     // claim RPC so there's no in-memory encryption for now
@@ -2325,6 +2401,11 @@ bool WalletImpl::isKeysFileLocked()
 {
     return m_wallet->is_keys_file_locked();
 }
+
+uint64_t WalletImpl::coldKeyImageSync(uint64_t &spent, uint64_t &unspent)
+{
+    return m_wallet->cold_key_image_sync(spent, unspent);
+}
 } // namespace
 
 namespace Bitmonero = Monero;
diff --git a/src/wallet/api/wallet.h b/src/wallet/api/wallet.h
index 55240d64f..f1f8f7e4d 100644
--- a/src/wallet/api/wallet.h
+++ b/src/wallet/api/wallet.h
@@ -89,6 +89,8 @@ public:
     std::string errorString() const override;
     void statusWithErrorString(int& status, std::string& errorString) const override;
     bool setPassword(const std::string &password) override;
+    bool setDevicePin(const std::string &password) override;
+    bool setDevicePassphrase(const std::string &password) override;
     std::string address(uint32_t accountIndex = 0, uint32_t addressIndex = 0) const override;
     std::string integratedAddress(const std::string &payment_id) const override;
     std::string secretViewKey() const override;
@@ -198,6 +200,7 @@ public:
     virtual bool lockKeysFile() override;
     virtual bool unlockKeysFile() override;
     virtual bool isKeysFileLocked() override;
+    virtual uint64_t coldKeyImageSync(uint64_t &spent, uint64_t &unspent) override;
 
 private:
     void clearStatus() const;
@@ -209,6 +212,7 @@ private:
     bool daemonSynced() const;
     void stopRefresh();
     bool isNewWallet() const;
+    void pendingTxPostProcess(PendingTransactionImpl * pending);
     bool doInit(const std::string &daemon_address, uint64_t upper_transaction_size_limit = 0, bool ssl = false);
 
 private:
diff --git a/src/wallet/api/wallet2_api.h b/src/wallet/api/wallet2_api.h
index 5c301974f..5410b827c 100644
--- a/src/wallet/api/wallet2_api.h
+++ b/src/wallet/api/wallet2_api.h
@@ -324,6 +324,19 @@ struct MultisigState {
     uint32_t total;
 };
 
+
+struct DeviceProgress {
+    DeviceProgress(): m_progress(0), m_indeterminate(false) {}
+    DeviceProgress(double progress, bool indeterminate=false): m_progress(progress), m_indeterminate(indeterminate) {}
+
+    virtual double progress() const { return m_progress; }
+    virtual bool indeterminate() const { return m_indeterminate; }
+
+protected:
+    double m_progress;
+    bool m_indeterminate;
+};
+
 struct WalletListener
 {
     virtual ~WalletListener() = 0;
@@ -364,6 +377,31 @@ struct WalletListener
      * @brief refreshed - called when wallet refreshed by background thread or explicitly refreshed by calling "refresh" synchronously
      */
     virtual void refreshed() = 0;
+
+    /**
+     * @brief called by device if the action is required
+     */
+    virtual void onDeviceButtonRequest(uint64_t code) {}
+
+    /**
+     * @brief called by device when PIN is needed
+     */
+    virtual optional<std::string> onDevicePinRequest() {
+        throw std::runtime_error("Not supported");
+    }
+
+    /**
+     * @brief called by device when passphrase entry is needed
+     */
+    virtual optional<std::string> onDevicePassphraseRequest(bool on_device) {
+        if (!on_device) throw std::runtime_error("Not supported");
+        return optional<std::string>();
+    }
+
+    /**
+     * @brief Signalizes device operation progress
+     */
+    virtual void onDeviceProgress(const DeviceProgress & event) {};
 };
 
 
@@ -375,7 +413,8 @@ struct Wallet
 {
     enum Device {
         Device_Software = 0,
-        Device_Ledger = 1
+        Device_Ledger = 1,
+        Device_Trezor = 2
     };
 
     enum Status {
@@ -401,6 +440,8 @@ struct Wallet
     //! returns both error and error string atomically. suggested to use in instead of status() and errorString()
     virtual void statusWithErrorString(int& status, std::string& errorString) const = 0;
     virtual bool setPassword(const std::string &password) = 0;
+    virtual bool setDevicePin(const std::string &password) { return false; };
+    virtual bool setDevicePassphrase(const std::string &password) { return false; };
     virtual std::string address(uint32_t accountIndex = 0, uint32_t addressIndex = 0) const = 0;
     std::string mainAddress() const { return address(0, 0); }
     virtual std::string path() const = 0;
@@ -947,6 +988,9 @@ struct Wallet
      * \return Device they are on
      */
     virtual Device getDeviceType() const = 0;
+
+    //! cold-device protocol key image sync
+    virtual uint64_t coldKeyImageSync(uint64_t &spent, uint64_t &unspent) = 0;
 };
 
 /**
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 11be8fd6e..5c12ad800 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -929,22 +929,30 @@ wallet_keys_unlocker::~wallet_keys_unlocker()
   }
 }
 
-void wallet_device_callback::on_button_request()
+void wallet_device_callback::on_button_request(uint64_t code)
 {
   if (wallet)
-    wallet->on_button_request();
+    wallet->on_device_button_request(code);
 }
 
-void wallet_device_callback::on_pin_request(epee::wipeable_string & pin)
+boost::optional<epee::wipeable_string> wallet_device_callback::on_pin_request()
 {
   if (wallet)
-    wallet->on_pin_request(pin);
+    return wallet->on_device_pin_request();
+  return boost::none;
 }
 
-void wallet_device_callback::on_passphrase_request(bool on_device, epee::wipeable_string & passphrase)
+boost::optional<epee::wipeable_string> wallet_device_callback::on_passphrase_request(bool on_device)
 {
   if (wallet)
-    wallet->on_passphrase_request(on_device, passphrase);
+    return wallet->on_device_passphrase_request(on_device);
+  return boost::none;
+}
+
+void wallet_device_callback::on_progress(const hw::device_progress& event)
+{
+  if (wallet)
+    wallet->on_device_progress(event);
 }
 
 wallet2::wallet2(network_type nettype, uint64_t kdf_rounds, bool unattended):
@@ -2884,6 +2892,7 @@ void wallet2::refresh(bool trusted_daemon, uint64_t start_height, uint64_t & blo
   std::vector<parsed_block> parsed_blocks;
   bool refreshed = false;
   std::shared_ptr<std::map<std::pair<uint64_t, uint64_t>, size_t>> output_tracker_cache;
+  hw::device &hwdev = m_account.get_device();
 
   // pull the first set of blocks
   get_short_chain_history(short_chain_history, (m_first_refresh_done || trusted_daemon) ? 1 : FIRST_REFRESH_GRANULARITY);
@@ -3040,6 +3049,7 @@ void wallet2::refresh(bool trusted_daemon, uint64_t start_height, uint64_t & blo
     LOG_PRINT_L1("Failed to check pending transactions");
   }
 
+  hwdev.computing_key_images(false);
   m_first_refresh_done = true;
 
   LOG_PRINT_L1("Refresh done, blocks received: " << blocks_fetched << ", balance (all accounts): " << print_money(balance_all()) << ", unlocked: " << print_money(unlocked_balance_all()));
@@ -9644,6 +9654,7 @@ void wallet2::cold_sign_tx(const std::vector<pending_tx>& ptx_vector, signed_tx_
   hw::wallet_shim wallet_shim;
   setup_shim(&wallet_shim, this);
   aux_data.tx_recipients = dsts_info;
+  aux_data.bp_version = use_fork_rules(HF_VERSION_SMALLER_BP, -10) ? 2 : 1;
   dev_cold->tx_sign(&wallet_shim, txs, exported_txs, aux_data);
   tx_device_aux = aux_data.tx_device_aux;
 
@@ -9860,7 +9871,7 @@ void wallet2::discard_unmixable_outputs()
   }
 }
 
-bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const
+bool wallet2::get_tx_key_cached(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const
 {
   additional_tx_keys.clear();
   const std::unordered_map<crypto::hash, crypto::secret_key>::const_iterator i = m_tx_keys.find(txid);
@@ -9873,6 +9884,82 @@ bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, s
   return true;
 }
 //----------------------------------------------------------------------------------------------------
+bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys)
+{
+  bool r = get_tx_key_cached(txid, tx_key, additional_tx_keys);
+  if (r)
+  {
+    return true;
+  }
+
+  auto & hwdev = get_account().get_device();
+
+  // So far only Cold protocol devices are supported.
+  if (hwdev.device_protocol() != hw::device::PROTOCOL_COLD)
+  {
+    return false;
+  }
+
+  const auto tx_data_it = m_tx_device.find(txid);
+  if (tx_data_it == m_tx_device.end())
+  {
+    MDEBUG("Aux data not found for txid: " << txid);
+    return false;
+  }
+
+  auto dev_cold = dynamic_cast<::hw::device_cold*>(&hwdev);
+  CHECK_AND_ASSERT_THROW_MES(dev_cold, "Device does not implement cold signing interface");
+  if (!dev_cold->is_get_tx_key_supported())
+  {
+    MDEBUG("get_tx_key not supported by the device");
+    return false;
+  }
+
+  hw::device_cold::tx_key_data_t tx_key_data;
+  dev_cold->load_tx_key_data(tx_key_data, tx_data_it->second);
+
+  // Load missing tx prefix hash
+  if (tx_key_data.tx_prefix_hash.empty())
+  {
+    COMMAND_RPC_GET_TRANSACTIONS::request req;
+    COMMAND_RPC_GET_TRANSACTIONS::response res;
+    req.txs_hashes.push_back(epee::string_tools::pod_to_hex(txid));
+    req.decode_as_json = false;
+    req.prune = true;
+    m_daemon_rpc_mutex.lock();
+    bool ok = epee::net_utils::invoke_http_json("/gettransactions", req, res, m_http_client);
+    m_daemon_rpc_mutex.unlock();
+    THROW_WALLET_EXCEPTION_IF(!ok || (res.txs.size() != 1 && res.txs_as_hex.size() != 1),
+                              error::wallet_internal_error, "Failed to get transaction from daemon");
+
+    cryptonote::transaction tx;
+    crypto::hash tx_hash{};
+    cryptonote::blobdata tx_data;
+    crypto::hash tx_prefix_hash{};
+    ok = string_tools::parse_hexstr_to_binbuff(res.txs_as_hex.front(), tx_data);
+    THROW_WALLET_EXCEPTION_IF(!ok, error::wallet_internal_error, "Failed to parse transaction from daemon");
+    THROW_WALLET_EXCEPTION_IF(!cryptonote::parse_and_validate_tx_from_blob(tx_data, tx, tx_hash, tx_prefix_hash),
+                              error::wallet_internal_error, "Failed to validate transaction from daemon");
+    THROW_WALLET_EXCEPTION_IF(tx_hash != txid, error::wallet_internal_error,
+                              "Failed to get the right transaction from daemon");
+
+    tx_key_data.tx_prefix_hash = std::string(tx_prefix_hash.data, 32);
+  }
+
+  std::vector<crypto::secret_key> tx_keys;
+  dev_cold->get_tx_key(tx_keys, tx_key_data, m_account.get_keys().m_view_secret_key);
+  if (tx_keys.empty())
+  {
+    return false;
+  }
+
+  tx_key = tx_keys[0];
+  tx_keys.erase(tx_keys.begin());
+  additional_tx_keys = tx_keys;
+
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
 void wallet2::set_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys)
 {
   // fetch tx from daemon and check if secret keys agree with corresponding public keys
@@ -10275,7 +10362,8 @@ std::string wallet2::get_tx_proof(const crypto::hash &txid, const cryptonote::ac
   {
     crypto::secret_key tx_key;
     std::vector<crypto::secret_key> additional_tx_keys;
-    THROW_WALLET_EXCEPTION_IF(!get_tx_key(txid, tx_key, additional_tx_keys), error::wallet_internal_error, "Tx secret key wasn't found in the wallet file.");
+    bool found_tx_key = get_tx_key(txid, tx_key, additional_tx_keys);
+    THROW_WALLET_EXCEPTION_IF(!found_tx_key, error::wallet_internal_error, "Tx secret key wasn't found in the wallet file.");
 
     const size_t num_sigs = 1 + additional_tx_keys.size();
     shared_secret.resize(num_sigs);
@@ -11448,29 +11536,48 @@ uint64_t wallet2::import_key_images(const std::vector<std::pair<crypto::key_imag
   return m_transfers[signed_key_images.size() - 1].m_block_height;
 }
 
-bool wallet2::import_key_images(std::vector<crypto::key_image> key_images)
+bool wallet2::import_key_images(std::vector<crypto::key_image> key_images, size_t offset, boost::optional<std::unordered_set<size_t>> selected_transfers)
 {
-  if (key_images.size() > m_transfers.size())
+  if (key_images.size() + offset > m_transfers.size())
   {
     LOG_PRINT_L1("More key images returned that we know outputs for");
     return false;
   }
-  for (size_t i = 0; i < key_images.size(); ++i)
+  for (size_t ki_idx = 0; ki_idx < key_images.size(); ++ki_idx)
   {
-    transfer_details &td = m_transfers[i];
-    if (td.m_key_image_known && !td.m_key_image_partial && td.m_key_image != key_images[i])
-      LOG_PRINT_L0("WARNING: imported key image differs from previously known key image at index " << i << ": trusting imported one");
-    td.m_key_image = key_images[i];
-    m_key_images[m_transfers[i].m_key_image] = i;
+    const size_t transfer_idx = ki_idx + offset;
+    if (selected_transfers && selected_transfers.get().find(transfer_idx) == selected_transfers.get().end())
+      continue;
+
+    transfer_details &td = m_transfers[transfer_idx];
+    if (td.m_key_image_known && !td.m_key_image_partial && td.m_key_image != key_images[ki_idx])
+      LOG_PRINT_L0("WARNING: imported key image differs from previously known key image at index " << ki_idx << ": trusting imported one");
+    td.m_key_image = key_images[ki_idx];
+    m_key_images[td.m_key_image] = transfer_idx;
     td.m_key_image_known = true;
     td.m_key_image_request = false;
     td.m_key_image_partial = false;
-    m_pub_keys[m_transfers[i].get_public_key()] = i;
+    m_pub_keys[td.get_public_key()] = transfer_idx;
   }
 
   return true;
 }
 
+bool wallet2::import_key_images(signed_tx_set & signed_tx, size_t offset, bool only_selected_transfers)
+{
+  std::unordered_set<size_t> selected_transfers;
+  if (only_selected_transfers)
+  {
+    for (const pending_tx & ptx : signed_tx.ptx)
+    {
+      for (const size_t s: ptx.selected_transfers)
+        selected_transfers.insert(s);
+    }
+  }
+
+  return import_key_images(signed_tx.key_images, offset, only_selected_transfers ? boost::make_optional(selected_transfers) : boost::none);
+}
+
 wallet2::payment_container wallet2::export_payments() const
 {
   payment_container payments;
@@ -12451,22 +12558,30 @@ wallet_device_callback * wallet2::get_device_callback()
   }
   return m_device_callback.get();
 }//----------------------------------------------------------------------------------------------------
-void wallet2::on_button_request()
+void wallet2::on_device_button_request(uint64_t code)
 {
-  if (0 != m_callback)
-    m_callback->on_button_request();
+  if (nullptr != m_callback)
+    m_callback->on_device_button_request(code);
 }
 //----------------------------------------------------------------------------------------------------
-void wallet2::on_pin_request(epee::wipeable_string & pin)
+boost::optional<epee::wipeable_string> wallet2::on_device_pin_request()
 {
-  if (0 != m_callback)
-    m_callback->on_pin_request(pin);
+  if (nullptr != m_callback)
+    return m_callback->on_device_pin_request();
+  return boost::none;
 }
 //----------------------------------------------------------------------------------------------------
-void wallet2::on_passphrase_request(bool on_device, epee::wipeable_string & passphrase)
+boost::optional<epee::wipeable_string> wallet2::on_device_passphrase_request(bool on_device)
 {
-  if (0 != m_callback)
-    m_callback->on_passphrase_request(on_device, passphrase);
+  if (nullptr != m_callback)
+    return m_callback->on_device_passphrase_request(on_device);
+  return boost::none;
+}
+//----------------------------------------------------------------------------------------------------
+void wallet2::on_device_progress(const hw::device_progress& event)
+{
+  if (nullptr != m_callback)
+    m_callback->on_device_progress(event);
 }
 //----------------------------------------------------------------------------------------------------
 std::string wallet2::get_rpc_status(const std::string &s) const
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index b510a8f99..3e0944d85 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -103,9 +103,10 @@ namespace tools
     virtual void on_lw_unconfirmed_money_received(uint64_t height, const crypto::hash &txid, uint64_t amount) {}
     virtual void on_lw_money_spent(uint64_t height, const crypto::hash &txid, uint64_t amount) {}
     // Device callbacks
-    virtual void on_button_request() {}
-    virtual void on_pin_request(epee::wipeable_string & pin) {}
-    virtual void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase) {}
+    virtual void on_device_button_request(uint64_t code) {}
+    virtual boost::optional<epee::wipeable_string> on_device_pin_request() { return boost::none; }
+    virtual boost::optional<epee::wipeable_string> on_device_passphrase_request(bool on_device) { return boost::none; }
+    virtual void on_device_progress(const hw::device_progress& event) {};
     // Common callbacks
     virtual void on_pool_tx_removed(const crypto::hash &txid) {}
     virtual ~i_wallet2_callback() {}
@@ -115,9 +116,10 @@ namespace tools
   {
   public:
     wallet_device_callback(wallet2 * wallet): wallet(wallet) {};
-    void on_button_request() override;
-    void on_pin_request(epee::wipeable_string & pin) override;
-    void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase) override;
+    void on_button_request(uint64_t code=0) override;
+    boost::optional<epee::wipeable_string> on_pin_request() override;
+    boost::optional<epee::wipeable_string> on_passphrase_request(bool on_device) override;
+    void on_progress(const hw::device_progress& event) override;
   private:
     wallet2 * wallet;
   };
@@ -1004,8 +1006,9 @@ namespace tools
     const std::string & device_derivation_path() const { return m_device_derivation_path; }
     void device_derivation_path(const std::string &device_derivation_path) { m_device_derivation_path = device_derivation_path; }
 
-    bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const;
+    bool get_tx_key_cached(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const;
     void set_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys);
+    bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys);
     void check_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys, const cryptonote::account_public_address &address, uint64_t &received, bool &in_pool, uint64_t &confirmations);
     void check_tx_key_helper(const crypto::hash &txid, const crypto::key_derivation &derivation, const std::vector<crypto::key_derivation> &additional_derivations, const cryptonote::account_public_address &address, uint64_t &received, bool &in_pool, uint64_t &confirmations);
     std::string get_tx_proof(const crypto::hash &txid, const cryptonote::account_public_address &address, bool is_subaddress, const std::string &message);
@@ -1127,7 +1130,8 @@ namespace tools
     std::pair<size_t, std::vector<std::pair<crypto::key_image, crypto::signature>>> export_key_images(bool all = false) const;
     uint64_t import_key_images(const std::vector<std::pair<crypto::key_image, crypto::signature>> &signed_key_images, size_t offset, uint64_t &spent, uint64_t &unspent, bool check_spent = true);
     uint64_t import_key_images(const std::string &filename, uint64_t &spent, uint64_t &unspent);
-    bool import_key_images(std::vector<crypto::key_image> key_images);
+    bool import_key_images(std::vector<crypto::key_image> key_images, size_t offset=0, boost::optional<std::unordered_set<size_t>> selected_transfers=boost::none);
+    bool import_key_images(signed_tx_set & signed_tx, size_t offset=0, bool only_selected_transfers=false);
     crypto::public_key get_tx_pub_key_from_received_outs(const tools::wallet2::transfer_details &td) const;
 
     void update_pool_state(bool refreshed = false);
@@ -1333,9 +1337,10 @@ namespace tools
     void create_keys_file(const std::string &wallet_, bool watch_only, const epee::wipeable_string &password, bool create_address_file);
 
     wallet_device_callback * get_device_callback();
-    void on_button_request();
-    void on_pin_request(epee::wipeable_string & pin);
-    void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase);
+    void on_device_button_request(uint64_t code);
+    boost::optional<epee::wipeable_string> on_device_pin_request();
+    boost::optional<epee::wipeable_string> on_device_passphrase_request(bool on_device);
+    void on_device_progress(const hw::device_progress& event);
 
     std::string get_rpc_status(const std::string &s) const;
     void throw_on_rpc_response_error(const boost::optional<std::string> &status, const char *method) const;