Bidium provides offline wallet to store BIDM securely and the token can be used to bid for products on the BIDM marketplace.
Your wallet is secured with bidium, Because the mobile wallet combined with bidium used for alot of things like sending money and receiving, Because bidium is easy to transact.
Yes, the whitepaper is quite long, and it will get you confused, so for you to have your confusion be cleared
I suggest you to watch the video of bidium enable for you to have gained more knowledge/information about how better the bidium platform is.