Your trading account can easily be taken back by simply contact support, also having your credit card on the account just increases the risk of this, whilst also exposing you to risk of fraud if somebody decides to use it. Offer altcoins as collateral, or you wont get a loan.
I will provide the email account so it cannot be returned. Broker only accepts requests from the email of the account, without it, I wont be able to make any changing on the account, and the loaner will have all access to it. The e-mail is only used for this trading account so I dont put myself up to anymore risk of getting something stolen.