updates for python3

plugins/cosigner_pool/qt.py

@@ -36,6 +36,7 @@ from electrum import transaction
 from electrum.plugins import BasePlugin, hook
 from electrum.i18n import _
 from electrum.wallet import Multisig_Wallet
+from electrum.util import bh2u
 
 from electrum_gui.qt.transaction_dialog import show_transaction
 
@@ -129,8 +130,8 @@ class Plugin(BasePlugin):
         self.cosigner_list = []
         for key, keystore in wallet.keystores.items():
             xpub = keystore.get_master_public_key()
-            K = bitcoin.deserialize_xpub(xpub)[-1].encode('hex')
-            _hash = bitcoin.Hash(K).encode('hex')
+            K = bitcoin.deserialize_xpub(xpub)[-1]
+            _hash = bh2u(bitcoin.Hash(K))
             if not keystore.is_watching_only():
                 self.keys.append((key, _hash, window))
             else: