diff --git a/contrib/build-wine/build-electrum-git.sh b/contrib/build-wine/build-electrum-git.sh
index 8366f2c9..c4904985 100755
--- a/contrib/build-wine/build-electrum-git.sh
+++ b/contrib/build-wine/build-electrum-git.sh
@@ -69,7 +69,7 @@ wine "C:/python$PYTHON_VERSION/scripts/pyinstaller.exe" --noconfirm --ascii --na
 
 # set timestamps in dist, in order to make the installer reproducible
 pushd dist
-find  -type f  -exec touch -d '2000-01-1 18:00:16' {} +
+find  -type f  -exec touch -d '2000-11-11T11:11:11+00:00' {} +
 popd
 
 # build NSIS installer
diff --git a/contrib/build-wine/build.sh b/contrib/build-wine/build.sh
index 7135525d..0c14199d 100755
--- a/contrib/build-wine/build.sh
+++ b/contrib/build-wine/build.sh
@@ -15,7 +15,7 @@ $here/prepare-hw.sh || exit 1
 echo "Resetting modification time in C:\Python..."
 # (Because of some bugs in pyinstaller)
 pushd /opt/wine64/drive_c/python*
-find -type f -exec touch -d '2000-11-11 11:11:11' {} +
+find -type f -exec touch -d '2000-11-11T11:11:11+00:00' {} +
 popd
 ls -l /opt/wine64/drive_c/python*
 
diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index bb007376..a08a58fc 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -118,6 +118,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.require_fee_update = False
         self.tx_notifications = []
         self.tl_windows = []
+        self.tx_external_keypairs = {}
 
         self.create_status_bar()
         self.need_update = threading.Event()
@@ -1414,7 +1415,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             self.on_error(exc_info)
             callback(False)
 
-        task = partial(self.wallet.sign_transaction, tx, password)
+        if self.tx_external_keypairs:
+            task = partial(Transaction.sign, tx, self.tx_external_keypairs)
+        else:
+            task = partial(self.wallet.sign_transaction, tx, password)
         WaitingDialog(self, _('Signing transaction...'), task,
                       on_signed, on_failed)
 
@@ -1557,6 +1561,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             e.setFrozen(False)
         self.set_pay_from([])
         self.rbf_checkbox.setChecked(False)
+        self.tx_external_keypairs = {}
         self.update_status()
         run_hook('do_clear', self)
 
@@ -2364,14 +2369,20 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         address_e.textChanged.connect(on_address)
         if not d.exec_():
             return
-        from electrum.wallet import sweep
+        from electrum.wallet import sweep_preparations
         try:
-            tx = sweep(get_pk(), self.network, self.config, get_address(), None)
+            self.do_clear()
+            coins, keypairs = sweep_preparations(get_pk(), self.network)
+            self.tx_external_keypairs = keypairs
+            self.spend_coins(coins)
+            self.payto_e.setText(get_address())
+            self.spend_max()
+            self.payto_e.setFrozen(True)
+            self.amount_e.setFrozen(True)
         except BaseException as e:
             self.show_message(str(e))
             return
         self.warn_if_watching_only()
-        self.show_transaction(tx)
 
     def _do_import(self, title, msg, func):
         text = text_dialog(self, title, msg + ' :', _('Import'))
diff --git a/gui/qt/transaction_dialog.py b/gui/qt/transaction_dialog.py
index 8e372868..71dbf8eb 100644
--- a/gui/qt/transaction_dialog.py
+++ b/gui/qt/transaction_dialog.py
@@ -178,7 +178,9 @@ class TxDialog(QDialog, MessageBoxMixin):
         tx_hash, status, label, can_broadcast, can_rbf, amount, fee, height, conf, timestamp, exp_n = self.wallet.get_tx_info(self.tx)
         size = self.tx.estimated_size()
         self.broadcast_button.setEnabled(can_broadcast)
-        self.sign_button.setEnabled(self.wallet.can_sign(self.tx))
+        can_sign = not self.tx.is_complete() and \
+            (self.wallet.can_sign(self.tx) or bool(self.main_window.tx_external_keypairs))
+        self.sign_button.setEnabled(can_sign)
         self.tx_hash_e.setText(tx_hash or _('Unknown'))
         if desc is None:
             self.tx_desc.hide()
diff --git a/lib/rsakey.py b/lib/rsakey.py
index a2087ded..d9079c30 100644
--- a/lib/rsakey.py
+++ b/lib/rsakey.py
@@ -526,7 +526,7 @@ class RSAKey(object):
         return False
 
     def generate(bits):
-        key = Python_RSAKey()
+        key = RSAKey()
         p = getRandomPrime(bits//2, False)
         q = getRandomPrime(bits//2, False)
         t = lcm(p-1, q-1)
@@ -540,4 +540,3 @@ class RSAKey(object):
         key.qInv = invMod(q, p)
         return key
     generate = staticmethod(generate)
-
diff --git a/lib/wallet.py b/lib/wallet.py
index 613d30a3..72d95fea 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -101,7 +101,7 @@ def append_utxos_to_inputs(inputs, network, pubkey, txin_type, imax):
         item['num_sig'] = 1
         inputs.append(item)
 
-def sweep(privkeys, network, config, recipient, fee=None, imax=100):
+def sweep_preparations(privkeys, network, imax=100):
 
     def find_utxos_for_privkey(txin_type, privkey, compressed):
         pubkey = bitcoin.public_key_from_private_key(privkey, compressed)
@@ -123,6 +123,11 @@ def sweep(privkeys, network, config, recipient, fee=None, imax=100):
             find_utxos_for_privkey('p2pk', privkey, compressed)
     if not inputs:
         raise BaseException(_('No inputs found. (Note that inputs need to be confirmed)'))
+    return inputs, keypairs
+
+
+def sweep(privkeys, network, config, recipient, fee=None, imax=100):
+    inputs, keypairs = sweep_preparations(privkeys, network, imax)
     total = sum(i.get('value') for i in inputs)
     if fee is None:
         outputs = [(TYPE_ADDRESS, recipient, total)]