Bittrex wants my credentials,where is crypto anonimity?! I cant withdraw my funds! I beware to give my credentials to bittrex I think its not safely 
Any oppinions?
There is no anonymity in crypto whatsoever when dealing with crypto-to-FIAT exchanges and vice versa. Any oppinions?It would really help if you told us what you're trying to withdraw.
They would only ask for your details if you're withdrawing FIAT, which is necessary due to KYC regulations.