old_contents: import boto3
  import cbor
  from grpc.beta import implementations
  from mediachain import Transactor_pb2
  from collections import namedtuple
  
  Config = namedtuple('Config', ['host', 'port'])
  
  def get_client(host, port):
      channel = implementations.insecure_channel(host, port)
      return Transactor_pb2.beta_create_TransactorService_stub(channel)
  
  def get_chain_head(config, object_id):
      client = get_client(config.host, config.port)
      request = Transactor_pb2.MultihashReference(reference=object_id)
      chain_head = client.FetchObjectChainHead(request)
      return get_object_chain_from_head(chain_head.reference)
  
  def get_table(name):
      dynamo = boto3.resource('dynamo')
      return dynamo.Table(name)
  
  def get_object(reference):
      table = get_table('mediachain')
      byte_string = table.get_item(Key={'multihash': reference})
      if byte_string is None:
          raise KeyError('Could not find key <%s> in Dyanmo'.format(reference))
      return cbor.loads(byte_string)
  
  def get_object_chain_from_head(reference, acc=[]):
      if reference is None:
          return acc
  
      obj = get_object(reference)
      next_ref = obj.get('chain')
  
      return get_object_chain(next_ref, acc + [obj])
  
new_contents: import boto3
  import cbor
  from grpc.beta import implementations
  from mediachain.proto import Transactor_pb2
  from collections import namedtuple
  
  Config = namedtuple('Config', ['host', 'port'])
  
  def get_client(host, port):
      channel = implementations.insecure_channel(host, port)
      return Transactor_pb2.beta_create_TransactorService_stub(channel)
  
  def get_chain_head(config, object_id):
      client = get_client(config.host, config.port)
      request = Transactor_pb2.MultihashReference(reference=object_id)
      chain_head = client.FetchObjectChainHead(request)
      return get_object_chain_from_head(chain_head.reference)
  
  def get_table(name):
      dynamo = boto3.resource('dynamo')
      return dynamo.Table(name)
  
  def get_object(reference):
      table = get_table('mediachain')
      byte_string = table.get_item(Key={'multihash': reference})
      if byte_string is None:
          raise KeyError('Could not find key <%s> in Dyanmo'.format(reference))
      return cbor.loads(byte_string)
  
  def get_object_chain_from_head(reference, acc=[]):
      if reference is None:
          return acc
  
      obj = get_object(reference)
      next_ref = obj.get('chain')
  
      return get_object_chain(next_ref, acc + [obj])
  
subject: Fix proto import