Don't worry, They are very safe. Your integrity won't be abused. They are also asking an Utility bill to verify your address before they can make the transaction.
Actually what is happening is; they don't tell you that you need to have your ID checked. So you wait for the transfer couple of days. And when you ask for your money after it is gone from the waiting list, they finally tell you that you need to send your ID. After you've sent your ID, you wait couple of days without answer. Then you go to the support to ask them what's wrong; that's where they tell you that it's required to send an Utility bill to verify your address.
So everyone who want to withdrawal his money for the first time have to:
-Process the withdrawal from the cashier
-Send to security@mansion.com your Picture ID and an Utility bill(electricity, Gas, Phone) with your name in it. If you don't have an Utility bill you can send your bank statements.
-then you can wait 48hours for the transaction to be proceed.
To make sure they are doing there Job, go to the Online support and ask them the state of the transaction after you've sent the documents. Sometimes they just don't answer to your mail.
I finally finish these steps... Thought I'd never get a hold of my money.