pool_contracts.txt

1.add_user(sex, age, unique user identifier, [ optional] phone number, [ optional] location) 
  return unique number as user_id
2.hash_tag_exists(pool_tag)
  return true or false
  return pool_tag number if exists(true)
3.search_question(pool_tag)
  return pool_tag,question,options[],results
4.create_question(pool_tag,user_id,question,options[],start time,end time,result_private)
   return pool_tag

5.answer_this_question(pool_tag,option,user_id,age,sex)
    return success or failure 

6.get_answers(pool_tag)
    return results