diff --git a/src/wallet/api/subaddress.cpp b/src/wallet/api/subaddress.cpp
index 9e358b4c8..0fe912a21 100644
--- a/src/wallet/api/subaddress.cpp
+++ b/src/wallet/api/subaddress.cpp
@@ -67,7 +67,10 @@ void SubaddressImpl::refresh(uint32_t accountIndex)
   clearRows();
   for (size_t i = 0; i < m_wallet->m_wallet->get_num_subaddresses(accountIndex); ++i)
   {
-    m_rows.push_back(new SubaddressRow(i, m_wallet->m_wallet->get_subaddress_as_str({accountIndex, (uint32_t)i}), m_wallet->m_wallet->get_subaddress_label({accountIndex, (uint32_t)i})));
+      m_rows.push_back(new SubaddressRow(i,
+                                         m_wallet->m_wallet->get_subaddress_as_str({accountIndex, (uint32_t)i}),
+                                         m_wallet->m_wallet->get_subaddress_label({accountIndex, (uint32_t)i}),
+                                         m_wallet->m_wallet->get_subaddress_used({accountIndex, (uint32_t)i})));
   }
 }
 
diff --git a/src/wallet/api/transaction_history.cpp b/src/wallet/api/transaction_history.cpp
index 9f5e41156..218bd9cfd 100644
--- a/src/wallet/api/transaction_history.cpp
+++ b/src/wallet/api/transaction_history.cpp
@@ -199,6 +199,9 @@ void TransactionHistoryImpl::refresh()
             ti->m_transfers.push_back({d.amount, d.address(m_wallet->m_wallet->nettype(), pd.m_payment_id)});
         }
 
+        for (const auto &r: pd.m_rings) {
+            ti->m_rings.push_back({string_tools::pod_to_hex(r.first), cryptonote::relative_output_offsets_to_absolute(r.second)});
+        }
         m_history.push_back(ti);
     }
 
@@ -229,10 +232,15 @@ void TransactionHistoryImpl::refresh()
         ti->m_label = pd.m_subaddr_indices.size() == 1 ? m_wallet->m_wallet->get_subaddress_label({pd.m_subaddr_account, *pd.m_subaddr_indices.begin()}) : "";
         ti->m_timestamp = pd.m_timestamp;
         ti->m_confirmations = 0;
-        for (const auto &d : pd.m_dests)
+
+        for (const auto &d : pd.m_dests) {
         {
             ti->m_transfers.push_back({d.amount, d.address(m_wallet->m_wallet->nettype(), pd.m_payment_id)});
-        }        
+        }
+
+        for (const auto &r: pd.m_rings) {
+            ti->m_rings.push_back({string_tools::pod_to_hex(r.first), cryptonote::relative_output_offsets_to_absolute(r.second)});
+        }
         m_history.push_back(ti);
     }
     
diff --git a/src/wallet/api/transaction_info.cpp b/src/wallet/api/transaction_info.cpp
index 572b04316..6f4794241 100644
--- a/src/wallet/api/transaction_info.cpp
+++ b/src/wallet/api/transaction_info.cpp
@@ -139,6 +139,11 @@ const std::vector<TransactionInfo::Transfer> &TransactionInfoImpl::transfers() c
     return m_transfers;
 }
 
+const std::vector<std::pair<std::string, std::vector<uint64_t>>> &TransactionInfoImpl::rings() const
+{
+    return m_rings;
+}
+
 uint64_t TransactionInfoImpl::confirmations() const
 {
     return m_confirmations;
diff --git a/src/wallet/api/transaction_info.h b/src/wallet/api/transaction_info.h
index 6337f2aaa..e931a2b4e 100644
--- a/src/wallet/api/transaction_info.h
+++ b/src/wallet/api/transaction_info.h
@@ -63,6 +63,8 @@ public:
     virtual uint64_t confirmations() const override;
     virtual uint64_t unlockTime() const override;
 
+    virtual const std::vector<std::pair<std::string, std::vector<uint64_t>>> &rings() const override;
+
 private:
     int         m_direction;
     bool        m_pending;
@@ -81,6 +83,7 @@ private:
     std::vector<Transfer> m_transfers;
     uint64_t    m_confirmations;
     uint64_t    m_unlock_time;
+    std::vector<std::pair<std::string, std::vector<uint64_t>>> m_rings;
 
     friend class TransactionHistoryImpl;
 
diff --git a/src/wallet/api/wallet.cpp b/src/wallet/api/wallet.cpp
index 1debd9849..be11d9d4f 100644
--- a/src/wallet/api/wallet.cpp
+++ b/src/wallet/api/wallet.cpp
@@ -35,6 +35,7 @@
 #include "transaction_history.h"
 #include "address_book.h"
 #include "subaddress.h"
+#include "coins.h"
 #include "subaddress_account.h"
 #include "common_defines.h"
 #include "common/util.h"
@@ -166,11 +167,8 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
                      << ", burnt: " << print_money(burnt)
                      << ", raw_output_value: " << print_money(amount)
                      << ", idx: " << subaddr_index);
-        // do not signal on received tx if wallet is not syncronized completely
-        if (m_listener && m_wallet->synchronized()) {
-            m_listener->moneyReceived(tx_hash, amount - burnt);
-            m_listener->updated();
-        }
+        m_listener->moneyReceived(tx_hash, amount);
+        m_listener->updated();
     }
 
     virtual void on_unconfirmed_money_received(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& tx, uint64_t amount, const cryptonote::subaddress_index& subaddr_index)
@@ -182,11 +180,8 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
                      << ", tx: " << tx_hash
                      << ", amount: " << print_money(amount)
                      << ", idx: " << subaddr_index);
-        // do not signal on received tx if wallet is not syncronized completely
-        if (m_listener && m_wallet->synchronized()) {
-            m_listener->unconfirmedMoneyReceived(tx_hash, amount);
-            m_listener->updated();
-        }
+        m_listener->unconfirmedMoneyReceived(tx_hash, amount);
+        m_listener->updated();
     }
 
     virtual void on_money_spent(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& in_tx,
@@ -198,11 +193,8 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
                      << ", tx: " << tx_hash
                      << ", amount: " << print_money(amount)
                      << ", idx: " << subaddr_index);
-        // do not signal on sent tx if wallet is not syncronized completely
-        if (m_listener && m_wallet->synchronized()) {
-            m_listener->moneySpent(tx_hash, amount);
-            m_listener->updated();
-        }
+        m_listener->moneySpent(tx_hash, amount);
+        m_listener->updated();
     }
 
     virtual void on_skip_transaction(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& tx)
@@ -436,6 +428,7 @@ WalletImpl::WalletImpl(NetworkType nettype, uint64_t kdf_rounds)
     m_refreshEnabled = false;
     m_addressBook.reset(new AddressBookImpl(this));
     m_subaddress.reset(new SubaddressImpl(this));
+    m_coins.reset(new CoinsImpl(this));
     m_subaddressAccount.reset(new SubaddressAccountImpl(this));
 
 
@@ -763,6 +756,35 @@ bool WalletImpl::recover(const std::string &path, const std::string &password, c
     return status() == Status_Ok;
 }
 
+bool WalletImpl::recoverDeterministicWalletFromSpendKey(const std::string &path, const std::string &password, const std::string &language, const std::string &spendkey_string)
+{
+    clearStatus();
+    m_errorString.clear();
+
+    m_recoveringFromSeed = true;
+    m_recoveringFromDevice = false;
+
+    // parse spend key
+    crypto::secret_key spendkey;
+    if (!spendkey_string.empty()) {
+        cryptonote::blobdata spendkey_data;
+        if(!epee::string_tools::parse_hexstr_to_binbuff(spendkey_string, spendkey_data) || spendkey_data.size() != sizeof(crypto::secret_key))
+        {
+            setStatusError(tr("failed to parse secret spend key"));
+            return false;
+        }
+        spendkey = *reinterpret_cast<const crypto::secret_key*>(spendkey_data.data());
+    }
+
+    try {
+        m_wallet->generate(path, password, spendkey, true, false);
+        setSeedLanguage(language);
+    } catch (const std::exception &e) {
+        setStatusCritical(e.what());
+    }
+    return status() == Status_Ok;
+}
+
 bool WalletImpl::close(bool store)
 {
 
@@ -1720,6 +1742,137 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
     return createTransactionMultDest(std::vector<string> {dst_addr}, payment_id, amount ? (std::vector<uint64_t> {*amount}) : (optional<std::vector<uint64_t>>()), mixin_count, priority, subaddr_account, subaddr_indices);
 }
 
+PendingTransaction *WalletImpl::createTransactionSingle(const string &key_image, const string &dst_addr,
+                                                        const size_t outputs, PendingTransaction::Priority priority)
+{
+    clearStatus();
+    // Pause refresh thread while creating transaction
+    pauseRefresh();
+
+    cryptonote::address_parse_info info;
+
+    size_t fake_outs_count = m_wallet->adjust_mixin(m_wallet->default_mixin());
+
+    uint32_t adjusted_priority = m_wallet->adjust_priority(static_cast<uint32_t>(priority));
+
+    PendingTransactionImpl * transaction = new PendingTransactionImpl(*this);
+
+    do {
+        std::vector<uint8_t> extra;
+        std::string extra_nonce;
+        vector<cryptonote::tx_destination_entry> dsts;
+
+        bool error = false;
+
+        crypto::key_image ki;
+        if (!epee::string_tools::hex_to_pod(key_image, ki))
+        {
+            setStatusError(tr("failed to parse key image"));
+            error = true;
+            break;
+        }
+
+        if (!cryptonote::get_account_address_from_str_or_url(info, m_wallet->nettype(), dst_addr))
+        {
+            setStatusError(tr("Invalid destination address"));
+            error = true;
+            break;
+        }
+        if (info.has_payment_id) {
+            if (!extra_nonce.empty()) {
+                setStatusError(tr("a single transaction cannot use more than one payment id"));
+                error = true;
+                break;
+            }
+            set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, info.payment_id);
+        }
+        if (error) {
+            break;
+        }
+        if (!extra_nonce.empty() && !add_extra_nonce_to_tx_extra(extra, extra_nonce)) {
+            setStatusError(tr("failed to set up payment id, though it was decoded correctly"));
+            break;
+        }
+        try {
+            transaction->m_pending_tx = m_wallet->create_transactions_single(ki, info.address, info.is_subaddress,
+                                                                             outputs, fake_outs_count, 0 /* unlock time */, priority, extra);
+
+            pendingTxPostProcess(transaction);
+
+            if (multisig().isMultisig) {
+                auto tx_set = m_wallet->make_multisig_tx_set(transaction->m_pending_tx);
+                transaction->m_pending_tx = tx_set.m_ptx;
+                transaction->m_signers = tx_set.m_signers;
+            }
+        } catch (const tools::error::daemon_busy&) {
+            // TODO: make it translatable with "tr"?
+            setStatusError(tr("daemon is busy. Please try again later."));
+        } catch (const tools::error::no_connection_to_daemon&) {
+            setStatusError(tr("no connection to daemon. Please make sure daemon is running."));
+        } catch (const tools::error::wallet_rpc_error& e) {
+            setStatusError(tr("RPC error: ") +  e.to_string());
+        } catch (const tools::error::get_outs_error &e) {
+            setStatusError((boost::format(tr("failed to get outputs to mix: %s")) % e.what()).str());
+        } catch (const tools::error::not_enough_unlocked_money& e) {
+            std::ostringstream writer;
+
+            writer << boost::format(tr("not enough money to transfer, available only %s, sent amount %s")) %
+                      print_money(e.available()) %
+                      print_money(e.tx_amount());
+            setStatusError(writer.str());
+        } catch (const tools::error::not_enough_money& e) {
+            std::ostringstream writer;
+
+            writer << boost::format(tr("not enough money to transfer, overall balance only %s, sent amount %s")) %
+                      print_money(e.available()) %
+                      print_money(e.tx_amount());
+            setStatusError(writer.str());
+        } catch (const tools::error::tx_not_possible& e) {
+            std::ostringstream writer;
+
+            writer << boost::format(tr("not enough money to transfer, available only %s, transaction amount %s = %s + %s (fee)")) %
+                      print_money(e.available()) %
+                      print_money(e.tx_amount() + e.fee())  %
+                      print_money(e.tx_amount()) %
+                      print_money(e.fee());
+            setStatusError(writer.str());
+        } catch (const tools::error::not_enough_outs_to_mix& e) {
+            std::ostringstream writer;
+            writer << tr("not enough outputs for specified ring size") << " = " << (e.mixin_count() + 1) << ":";
+            for (const std::pair<uint64_t, uint64_t> outs_for_amount : e.scanty_outs()) {
+                writer << "\n" << tr("output amount") << " = " << print_money(outs_for_amount.first) << ", " << tr("found outputs to use") << " = " << outs_for_amount.second;
+            }
+            writer << "\n" << tr("Please sweep unmixable outputs.");
+            setStatusError(writer.str());
+        } catch (const tools::error::tx_not_constructed&) {
+            setStatusError(tr("transaction was not constructed"));
+        } catch (const tools::error::tx_rejected& e) {
+            std::ostringstream writer;
+            writer << (boost::format(tr("transaction %s was rejected by daemon with status: ")) % get_transaction_hash(e.tx())) <<  e.status();
+            setStatusError(writer.str());
+        } catch (const tools::error::tx_sum_overflow& e) {
+            setStatusError(e.what());
+        } catch (const tools::error::zero_destination&) {
+            setStatusError(tr("one of destinations is zero"));
+        } catch (const tools::error::tx_too_big& e) {
+            setStatusError(tr("failed to find a suitable way to split transactions"));
+        } catch (const tools::error::transfer_error& e) {
+            setStatusError(string(tr("unknown transfer error: ")) + e.what());
+        } catch (const tools::error::wallet_internal_error& e) {
+            setStatusError(string(tr("internal error: ")) + e.what());
+        } catch (const std::exception& e) {
+            setStatusError(string(tr("unexpected error: ")) + e.what());
+        } catch (...) {
+            setStatusError(tr("unknown error"));
+        }
+    } while (false);
+
+    statusWithErrorString(transaction->m_status, transaction->m_errorString);
+    // Resume refresh thread
+    startRefresh();
+    return transaction;
+}
+
 PendingTransaction *WalletImpl::createSweepUnmixableTransaction()
 
 {
@@ -1839,6 +1992,11 @@ AddressBook *WalletImpl::addressBook()
     return m_addressBook.get();
 }
 
+Coins *WalletImpl::coins()
+{
+    return m_coins.get();
+}
+
 Subaddress *WalletImpl::subaddress()
 {
     return m_subaddress.get();
diff --git a/src/wallet/api/wallet.h b/src/wallet/api/wallet.h
index f813db83e..84e2fdc58 100644
--- a/src/wallet/api/wallet.h
+++ b/src/wallet/api/wallet.h
@@ -46,6 +46,7 @@ class PendingTransactionImpl;
 class UnsignedTransactionImpl;
 class AddressBookImpl;
 class SubaddressImpl;
+class CoinsImpl;
 class SubaddressAccountImpl;
 struct Wallet2CallbackImpl;
 class PendingTransactionInfoImpl;
@@ -78,6 +79,10 @@ public:
                             const std::string &address_string, 
                             const std::string &viewkey_string,
                             const std::string &spendkey_string = "");
+    bool recoverDeterministicWalletFromSpendKey(const std::string &path,
+                                                const std::string &password,
+                                                const std::string &language,
+                                                const std::string &spendkey_string);
     bool recoverFromDevice(const std::string &path,
                            const std::string &password,
                            const std::string &device_name);
@@ -164,6 +169,10 @@ public:
                                         PendingTransaction::Priority priority = PendingTransaction::Priority_Low,
                                         uint32_t subaddr_account = 0,
                                         std::set<uint32_t> subaddr_indices = {}) override;
+
+    PendingTransaction * createTransactionSingle(const std::string &key_image, const std::string &dst_addr,
+                                                 size_t outputs = 1, PendingTransaction::Priority priority = PendingTransaction::Priority_Low) override;
+
     virtual PendingTransaction * createSweepUnmixableTransaction() override;
     bool submitTransaction(const std::string &fileName) override;
     virtual UnsignedTransaction * loadUnsignedTx(const std::string &unsigned_filename) override;
@@ -181,6 +190,7 @@ public:
                                             PendingTransaction::Priority priority) const override;
     virtual TransactionHistory * history() override;
     virtual AddressBook * addressBook() override;
+    virtual Coins * coins() override;
     virtual Subaddress * subaddress() override;
     virtual SubaddressAccount * subaddressAccount() override;
     virtual void setListener(WalletListener * l) override;
@@ -252,6 +262,7 @@ private:
     friend struct Wallet2CallbackImpl;
     friend class AddressBookImpl;
     friend class SubaddressImpl;
+    friend class CoinsImpl;
     friend class SubaddressAccountImpl;
     friend class PendingTransactionInfoImpl;
     friend class TransactionConstructionInfoImpl;
@@ -265,6 +276,7 @@ private:
     std::unique_ptr<Wallet2CallbackImpl> m_wallet2Callback;
     std::unique_ptr<AddressBookImpl>  m_addressBook;
     std::unique_ptr<SubaddressImpl>  m_subaddress;
+    std::unique_ptr<CoinsImpl> m_coins;
     std::unique_ptr<SubaddressAccountImpl>  m_subaddressAccount;
 
     // multi-threaded refresh stuff
diff --git a/src/wallet/api/wallet2_api.h b/src/wallet/api/wallet2_api.h
index 7a49e4ee9..96e022987 100644
--- a/src/wallet/api/wallet2_api.h
+++ b/src/wallet/api/wallet2_api.h
@@ -249,6 +249,7 @@ struct TransactionInfo
     virtual std::string paymentId() const = 0;
     //! only applicable for output transactions
     virtual const std::vector<Transfer> & transfers() const = 0;
+    virtual const std::vector<std::pair<std::string, std::vector<uint64_t>>> & rings() const = 0;
 };
 /**
  * @brief The TransactionHistory - interface for displaying transaction history
@@ -311,22 +312,66 @@ struct AddressBook
     virtual int lookupPaymentID(const std::string &payment_id) const = 0;
 };
 
+/**
+ * @brief The CoinsInfo - interface for displaying coins information
+ */
+struct CoinsInfo
+{
+    virtual ~CoinsInfo() = 0;
+
+    virtual uint64_t blockHeight() const = 0;
+    virtual std::string hash() const = 0;
+    virtual size_t internalOutputIndex() const = 0;
+    virtual uint64_t globalOutputIndex() const = 0;
+    virtual bool spent() const = 0;
+    virtual bool frozen() const = 0;
+    virtual uint64_t spentHeight() const = 0;
+    virtual uint64_t amount() const = 0;
+    virtual bool rct() const = 0;
+    virtual bool keyImageKnown() const = 0;
+    virtual size_t pkIndex() const = 0;
+    virtual uint32_t subaddrIndex() const = 0;
+    virtual uint32_t subaddrAccount() const = 0;
+    virtual std::string address() const = 0;
+    virtual std::string addressLabel() const = 0;
+    virtual std::string keyImage() const = 0;
+    virtual uint64_t unlockTime() const = 0;
+    virtual bool unlocked() const = 0;
+    virtual std::string pubKey() const = 0;
+    virtual bool coinbase() const = 0;
+};
+
+struct Coins
+{
+    virtual ~Coins() = 0;
+    virtual int count() const = 0;
+    virtual CoinsInfo * coin(int index)  const = 0;
+    virtual std::vector<CoinsInfo*> getAll() const = 0;
+    virtual void refresh() = 0;
+    virtual void setFrozen(int index) = 0;
+    virtual void thaw(int index) = 0;
+    virtual bool isTransferUnlocked(uint64_t unlockTime, uint64_t blockHeight) = 0;
+};
+
 struct SubaddressRow {
 public:
-    SubaddressRow(std::size_t _rowId, const std::string &_address, const std::string &_label):
+    SubaddressRow(std::size_t _rowId, const std::string &_address, const std::string &_label, bool _used):
         m_rowId(_rowId),
         m_address(_address),
-        m_label(_label) {}
+        m_label(_label),
+        m_used(_used) {}
  
 private:
     std::size_t m_rowId;
     std::string m_address;
     std::string m_label;
+    bool m_used;
 public:
     std::string extra;
     std::string getAddress() const {return m_address;}
     std::string getLabel() const {return m_label;}
     std::size_t getRowId() const {return m_rowId;}
+    bool isUsed() const {return m_used;}
 };
 
 struct Subaddress
@@ -914,6 +959,18 @@ struct Wallet
                                                    uint32_t subaddr_account = 0,
                                                    std::set<uint32_t> subaddr_indices = {}) = 0;
 
+    /*!
+     * \brief createTransactionSingle creates transaction with single input
+     * \param key_image               key image as string
+     * \param dst_addr                destination address as string
+     * \param priority
+     * \return                        PendingTransaction object. caller is responsible to check PendingTransaction::status()
+     *                                after object returned
+     */
+
+    virtual PendingTransaction * createTransactionSingle(const std::string &key_image, const std::string &dst_addr,
+                                                         size_t outputs = 1, PendingTransaction::Priority = PendingTransaction::Priority_Low) = 0;
+
     /*!
      * \brief createSweepUnmixableTransaction creates transaction with unmixable outputs.
      * \return                  PendingTransaction object. caller is responsible to check PendingTransaction::status()
@@ -1008,6 +1065,7 @@ struct Wallet
 
     virtual TransactionHistory * history() = 0;
     virtual AddressBook * addressBook() = 0;
+    virtual Coins * coins() = 0;
     virtual Subaddress * subaddress() = 0;
     virtual SubaddressAccount * subaddressAccount() = 0;
     virtual void setListener(WalletListener *) = 0;
@@ -1064,7 +1122,8 @@ struct Wallet
     /*
      * \brief signMessage - sign a message with the spend private key
      * \param message - the message to sign (arbitrary byte data)
-     * \return the signature
+     * \param address - the address to make the signature with, defaults to primary address (optional)
+     * \return the signature, empty string if the address is invalid or does not belong to the wallet
      */
     virtual std::string signMessage(const std::string &message, const std::string &address = "") = 0;
     /*!
@@ -1275,6 +1334,25 @@ struct WalletManager
         return createWalletFromKeys(path, password, language, testnet ? TESTNET : MAINNET, restoreHeight, addressString, viewKeyString, spendKeyString);
     }
 
+    /*!
+     * \brief  recover deterministic wallet from spend key.
+     * \param  path           Name of wallet file to be created
+     * \param  password       Password of wallet file
+     * \param  language       language
+     * \param  nettype        Network type
+     * \param  restoreHeight  restore from start height
+     * \param  spendKeyString spend key
+     * \param  kdf_rounds     Number of rounds for key derivation function
+     * \return                Wallet instance (Wallet::status() needs to be called to check if recovered successfully)
+     */
+    virtual Wallet * createDeterministicWalletFromSpendKey(const std::string &path,
+                                                           const std::string &password,
+                                                           const std::string &language,
+                                                           NetworkType nettype,
+                                                           uint64_t restoreHeight,
+                                                           const std::string &spendKeyString,
+                                                           uint64_t kdf_rounds = 1) = 0;
+
    /*!
     * \deprecated this method creates a wallet WITHOUT a passphrase, use createWalletFromKeys(..., password, ...) instead
     * \brief  recovers existing wallet using keys. Creates a view only wallet if spend key is omitted
diff --git a/src/wallet/api/wallet_manager.cpp b/src/wallet/api/wallet_manager.cpp
index e81b8f83a..b166d8ac7 100644
--- a/src/wallet/api/wallet_manager.cpp
+++ b/src/wallet/api/wallet_manager.cpp
@@ -127,6 +127,22 @@ Wallet *WalletManagerImpl::createWalletFromKeys(const std::string &path,
     return wallet;
 }
 
+Wallet *WalletManagerImpl::createDeterministicWalletFromSpendKey(const std::string &path,
+                                                                 const std::string &password,
+                                                                 const std::string &language,
+                                                                 NetworkType nettype,
+                                                                 uint64_t restoreHeight,
+                                                                 const std::string &spendkey_string,
+                                                                 uint64_t kdf_rounds)
+{
+    WalletImpl * wallet = new WalletImpl(nettype, kdf_rounds);
+    if(restoreHeight > 0){
+        wallet->setRefreshFromBlockHeight(restoreHeight);
+    }
+    wallet->recoverDeterministicWalletFromSpendKey(path, password, language, spendkey_string);
+    return wallet;
+}
+
 Wallet *WalletManagerImpl::createWalletFromDevice(const std::string &path,
                                                   const std::string &password,
                                                   NetworkType nettype,
diff --git a/src/wallet/api/wallet_manager.h b/src/wallet/api/wallet_manager.h
index a223e1df9..206aedc14 100644
--- a/src/wallet/api/wallet_manager.h
+++ b/src/wallet/api/wallet_manager.h
@@ -67,6 +67,13 @@ public:
                                                     const std::string &addressString,
                                                     const std::string &viewKeyString,
                                                     const std::string &spendKeyString = "") override;
+    virtual Wallet * createDeterministicWalletFromSpendKey(const std::string &path,
+                                                           const std::string &password,
+                                                           const std::string &language,
+                                                           NetworkType nettype,
+                                                           uint64_t restoreHeight,
+                                                           const std::string &spendkey_string,
+                                                           uint64_t kdf_rounds) override;
     virtual Wallet * createWalletFromDevice(const std::string &path,
                                             const std::string &password,
                                             NetworkType nettype,
diff --git a/src/wallet/node_rpc_proxy.cpp b/src/wallet/node_rpc_proxy.cpp
index 0a9ea8f7b..5557cd25c 100644
--- a/src/wallet/node_rpc_proxy.cpp
+++ b/src/wallet/node_rpc_proxy.cpp
@@ -193,7 +193,7 @@ boost::optional<std::string> NodeRPCProxy::get_target_height(uint64_t &height)
   auto res = get_info();
   if (res)
     return res;
-  height = m_target_height;
+  height = m_target_height > m_height ? m_target_height : m_height;
   return boost::optional<std::string>();
 }
 
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 3c48ec0f6..0a68b085b 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -1550,6 +1550,14 @@ void wallet2::add_subaddress_account(const std::string& label)
   m_subaddress_labels[index_major][0] = label;
 }
 //----------------------------------------------------------------------------------------------------
+bool wallet2::get_subaddress_used(const cryptonote::subaddress_index& index)
+{
+  return std::find_if(m_transfers.begin(), m_transfers.end(),
+  [this, index](const transfer_details &td) {
+  return td.m_subaddr_index == index;
+  }) != m_transfers.end();
+}
+//----------------------------------------------------------------------------------------------------
 void wallet2::add_subaddress(uint32_t index_major, const std::string& label)
 {
   THROW_WALLET_EXCEPTION_IF(index_major >= m_subaddress_labels.size(), error::account_index_outofbound);
@@ -2155,13 +2163,14 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
           uint64_t amount = tx.vout[o].amount ? tx.vout[o].amount : tx_scan_info[o].amount;
           if (!pool)
           {
-	    m_transfers.push_back(transfer_details{});
-	    transfer_details& td = m_transfers.back();
-	    td.m_block_height = height;
-	    td.m_internal_output_index = o;
-	    td.m_global_output_index = o_indices[o];
-	    td.m_tx = (const cryptonote::transaction_prefix&)tx;
-	    td.m_txid = txid;
+            boost::unique_lock<boost::shared_mutex> lock(m_transfers_mutex);
+            m_transfers.push_back(transfer_details{});
+            transfer_details& td = m_transfers.back();
+            td.m_block_height = height;
+            td.m_internal_output_index = o;
+            td.m_global_output_index = o_indices[o];
+            td.m_tx = (const cryptonote::transaction_prefix&)tx;
+            td.m_txid = txid;
             td.m_key_image = tx_scan_info[o].ki;
             td.m_key_image_known = !m_watch_only && !m_multisig;
             if (!td.m_key_image_known)
@@ -2258,12 +2267,13 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
           uint64_t extra_amount = amount - burnt;
           if (!pool)
           {
+            boost::unique_lock<boost::shared_mutex> lock(m_transfers_mutex);
             transfer_details &td = m_transfers[kit->second];
-	    td.m_block_height = height;
-	    td.m_internal_output_index = o;
-	    td.m_global_output_index = o_indices[o];
-	    td.m_tx = (const cryptonote::transaction_prefix&)tx;
-	    td.m_txid = txid;
+            td.m_block_height = height;
+            td.m_internal_output_index = o;
+            td.m_global_output_index = o_indices[o];
+            td.m_tx = (const cryptonote::transaction_prefix&)tx;
+            td.m_txid = txid;
             td.m_amount = amount;
             td.m_pk_index = pk_index - 1;
             td.m_subaddr_index = tx_scan_info[o].received->index;
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 4bcc6a2c0..a8bbd3101 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -1007,6 +1007,7 @@ private:
     std::string get_subaddress_as_str(const cryptonote::subaddress_index& index) const;
     std::string get_address_as_str() const { return get_subaddress_as_str({0, 0}); }
     std::string get_integrated_address_as_str(const crypto::hash8& payment_id) const;
+    bool get_subaddress_used(const cryptonote::subaddress_index& index);
     void add_subaddress_account(const std::string& label);
     size_t get_num_subaddress_accounts() const { return m_subaddress_labels.size(); }
     size_t get_num_subaddresses(uint32_t index_major) const { return index_major < m_subaddress_labels.size() ? m_subaddress_labels[index_major].size() : 0; }
@@ -1677,6 +1678,7 @@ private:
 
     static std::string get_default_daemon_address() { CRITICAL_REGION_LOCAL(default_daemon_address_lock); return default_daemon_address; }
 
+    boost::shared_mutex m_transfers_mutex;
   private:
     /*!
      * \brief  Stores wallet information to wallet file.