old_contents: from graphenebase.signedtransactions import Signed_Transaction as GrapheneSigned_Transaction
  from .operations import Operation
  from .chains import known_chains
  import logging
  log = logging.getLogger(__name__)
  
  
  class Signed_Transaction(GrapheneSigned_Transaction) :
      """ Create a signed transaction and offer method to create the
          signature
  
          :param num refNum: parameter ref_block_num (see ``getBlockParams``)
          :param num refPrefix: parameter ref_block_prefix (see ``getBlockParams``)
          :param str expiration: expiration date
          :param Array operations:  array of operations
      """
      def __init__(self, *args, **kwargs) :
          super(Signed_Transaction, self).__init__(*args, **kwargs)
  
      def sign(self, wifkeys, chain="STEEM") :
          return super(Signed_Transaction, self).sign(wifkeys, chain)
  
      def verify(self, pubkeys, chain="STEEM"):
          return super(Signed_Transaction, self).verify(pubkeys, chain)
  
      def getOperationKlass(self):
          return Operation
  
      def getKnownChains(self):
          return known_chains
  
new_contents: from graphenebase.signedtransactions import Signed_Transaction as GrapheneSigned_Transaction
  from .operations import Operation
  from .chains import known_chains
  import logging
  log = logging.getLogger(__name__)
  
  
  class Signed_Transaction(GrapheneSigned_Transaction) :
      """ Create a signed transaction and offer method to create the
          signature
  
          :param num refNum: parameter ref_block_num (see ``getBlockParams``)
          :param num refPrefix: parameter ref_block_prefix (see ``getBlockParams``)
          :param str expiration: expiration date
          :param Array operations:  array of operations
      """
      def __init__(self, *args, **kwargs) :
          super(Signed_Transaction, self).__init__(*args, **kwargs)
  
      def sign(self, wifkeys, chain="STEEM") :
          return super(Signed_Transaction, self).sign(wifkeys, chain)
  
      def verify(self, pubkeys=[], chain="STEEM"):
          return super(Signed_Transaction, self).verify(pubkeys, chain)
  
      def getOperationKlass(self):
          return Operation
  
      def getKnownChains(self):
          return known_chains
  
subject: return pub keys on verify signed transactions