Hello all,
I have completed a secured deal in
https://crexbtc.comnow when I try to withdraw they ask to verify the account by depositing 0.1 BTC in the account from an external address
By completing a secure deal you mean they gave you a bonus in an account in the exchange?
Sorry to disappoint you, the BTC you are trying to withdraw is not there. What you see in your account are just cooked up figures intended to make you think you have some BTC.
I have visited the website and it looks like one of the many scam exchanges I have seen before. I don't send them any BTC