Hi, this is very good guidance. How can I sign a message so that I can prove a certain email belongs to me?
I don't think there is a way to do it to prove that you own an email address as such... signing only allows you to prove that you are in control of a private key/bitcoin address.sorry but i use exchanger wallet how can i get the private key ?
The simple answer is that (generally) you can not get the private key for addresses controlled by exchanges, thus you can not sign messages for exchange wallet addresses. Get a "proper" wallet where you can access the private keys 