Old architectural exchange: do not secure, all fund of users store in hot wallet that could lost all funds anytime.
Coinifinex new technology:
o   When users register their accounts on the exchange, the system automatically creates wallets for users to deposit the exchange for sale. This auto-generated system is still a hot wallet.
o   However, as soon as the system receives the assets in the hot wallet, it will transfer all the assets into the cold wallet immediately. This means all the user's virtual assets / money will be stored in cold wallets. As you know, cold wallet is not exposed to the internet. Therefore, hacker cannot access it from the Internet.

Let me know if you have any questions.