Don't forget to check contract address for ERC20 token. There is high risk. Multiple case happened with fake token. Scammers just send fake token as collateral. Actually that's wasn't real token. So if you are going to ask alt coins collateral than check first on CMC to confirm token contract address. Also you can check which exchange are listed. It will better for you. It's should not only check for collateral, you should check also like airdrop, or if some one offering cheap price. Than also you need check contract address. I have noticed sometimes scammers promote fake token and try to sale cheap price. In that case also you should check from CMC.
I agree with this, I had someone send me a couple hundred in fake Eidoo. A good way to ensure you are not getting fake collateral is to hold the collateral directly on an exchange as exchanges wont accept fake coin.