You don't sign message with you address, you sign them with your private key. And as long as you can sign a transaction you can also sign a message.
There IS a standard for signing messages from any address type available, and it has been around for many years now and is recognized by major bitcoin implementations. If one software doesn't have the feature then it is that software's flaw and you should complain to their developers about why they haven't implemented such an old feature.
Thank you. It is excellent post that reminds me another topic, to verify message signed by a Segwit address.There IS a standard for signing messages from any address type available, and it has been around for many years now and is recognized by major bitcoin implementations. If one software doesn't have the feature then it is that software's flaw and you should complain to their developers about why they haven't implemented such an old feature.
I read it again and found that with same private key, it can be converted into different bitcoin address. More interesting finding, you are the one helped @lulucrypto to make that topic.
