fix #4218

lib/keystore.py

@@ -76,6 +76,8 @@ def can_sign(self, tx):
             return False
         return bool(self.get_tx_derivations(tx))
 
+    def ready_to_sign(self):
+        return not self.is_watching_only()
 
 
 class Software_KeyStore(KeyStore):
@@ -536,6 +538,17 @@ def get_password_for_storage_encryption(self):
         password = self.get_pubkey_from_xpub(xpub, ())
         return password
 
+    def has_usable_connection_with_device(self):
+        if not hasattr(self, 'plugin'):
+            return False
+        client = self.plugin.get_client(self, force_pair=False)
+        if client is None:
+            return False
+        return client.has_usable_connection_with_device()
+
+    def ready_to_sign(self):
+        return super().ready_to_sign() and self.has_usable_connection_with_device()
+
 
 def bip39_normalize_passphrase(passphrase):
     return normalize('NFKD', passphrase or '')

lib/wallet.py

@@ -1458,8 +1458,8 @@ def sign_transaction(self, tx, password):
         # hardware wallets require extra info
         if any([(isinstance(k, Hardware_KeyStore) and k.can_sign(tx)) for k in self.get_keystores()]):
             self.add_hw_info(tx)
-        # sign
-        for k in self.get_keystores():
+        # sign. start with ready keystores.
+        for k in sorted(self.get_keystores(), key=lambda ks: ks.ready_to_sign(), reverse=True):
             try:
                 if k.can_sign(tx):
                     k.sign_transaction(tx, password)