code: def blank_account(cls, db, addr, initial_nonce=0):
          
          db.put(BLANK_HASH, b"")
          o = cls(initial_nonce, 0, trie.BLANK_ROOT, BLANK_HASH, db, addr)
          o.existent_at_start = False
          return o
docs: creates a blank account.
  
          :param db:
          :param addr:
          :param initial_nonce:
          :return: