32AzRX2uDDeF8pYgv21TRr1HE6C5gEibyU
You stake your bitcoin address just to prove that you're the real owner of that account.Do you able to sign massage from that address in future?If not then post a address with sign message like others.
learn How to sign message : https://bitcointalksearch.org/topic/how-to-sign-a-message-990345
It cant be used to sign, because there is no clear way how to sign with a script address. Its possible that there is no private key for the address or that there are 3, 7, 15 or any number actually. Which one produces a valid signature? All 3/7/15? 2/5/13 of 3/7/15? In which order? None of these questions are universally clear and thus it does not help to stake one of these addresses.