hi representative of coinsph. i just want to ask if there has a chance that we can make a sign message in our bitcoin address that we have in coinph?. because its verry important. or do you have a future plan of having a sign message in you platform?.
Coins.ph will not allow you to do a sign message because they are an exchange, they cannot even give you the private key of your Bitcoin address. For what purposes do you want to use the sign message? why not just use other Bitcoin wallet that supports sign messages features? there are lots of wallet that will allow you to do it, you can try using wallets like electrum or mycelium and you can perform a sign message with an ease. And I think coins.ph are using a multi signature addresses (which have ) so it is not possible to make a sign message using their service. Try to read this
https://bitcointalk.org/index.php?topic=2826914.0