guys did you know what he was talking about ?
he did not ask about how to regain his MEW password or else.
but he was asking about this and this ;
Did Anyone of you lost password or authenticator of exchange and reset password? Then Did you ever ask to prove the ownership of MEW?
Because I was asked( I transferred coins from MEW). What is the solution for that? Signed message is enough for that?
could you tell us what exchange it is ? of course as long as you can sign the message you can show them this as a prove of an ownership.
yes that is the easiest and safest way to prove it.
do not give them your private keys or any informative data about you.