Does anybody know if any verification is neccessary for deposit and withdrawal of bitcoins on finex?
No verification is needed but it may depends on your location..
I don't think verification is needed for small amounts of Bitcoins, but if you start moving big amounts of Bitcoins Bitfinex might suddenly demand verification, and refuse to let you have your coins back without it. Plus, beware of possible withdrawal delays if the hot wallet's empty. Their terms say they can take up to 12 hours to process a withdrawal.
https://www.bitfinex.com/supportHow long does it take for a BTC/LTC/ETH withdrawal to be processed?
When you enable two-factor authentication your withdrawal will be approved instantly, unless you have logged with a new IP address in the previous 24 hours.
If you haven't enabled two-factor authentication you will receive an email to confirm your withdrawal. Your withdrawal will not be approved and processed as long as you don't confirm it with this link. Please note that while most withdrawals of Bitcoins/Litecoins will be processed within 2 minutes, the guaranteed processing time is within 12 hours. A withdrawal might be delayed for two reasons:
Our "hot wallet" (special wallet used to process withdrawals) is empty.
For Bitgo enabled accounts, the withdrawal hit a spending limit (global or specific to the account).