Hello, You might have heard about exchange scam. Here's another one in this list namely "ExtStock Crypto Exchange".
I've used it quite a bit for airdrop purpose. At the beginning they were a good exchange although they charged high fees but now they've turned into a scam exchange. The main reason is you can not withdraw your assets now. Whenever I tried to withdraw my assets from ExtStock, a warning massages appeared "Security alert detected, please contact support "


So kindly stay away from using ExtStock if you don't wanna lose your assets.