code: def in_blobstore(self) -> bool:
      if (
          self.key is not None
          and self.key.startswith("blobstore/")
          and self.storage_handler.get_file_timestamp(self.key)
          is not None
      ):
          return True
      return False
  
imports: import hashlib
  import os
  import re
  import tarfile
  from typing import Dict
  from studio.artifacts import artifacts_tracker
  from studio.util import util, logs
  from studio.credentials import credentials
  from studio.storage import storage_setup
  from studio.storage.storage_type import StorageType
  from studio.storage.storage_handler import StorageHandler
  from studio.storage.storage_handler_factory import StorageHandlerFactory
  from studio.storage.storage_util import tar_artifact, untar_artifact
label_desc: Use image node_id 19 for calling the Artifact obj's underlying member method code with example usage: obj.in_blobstore() and returns: False, True