At first it was empty; my wallet was owned by me, and no one could monitor, modify or steal the data without my permission; I could fill it with something of my choice; I could add different types of things: I'm ID card, payment card, membership card, VIP card, key card, cash, receipt, photo, etc.; most of the things I put in my wallet were issued to me by a third party, and they could revoke its validity, but I could still have control over the wallet; and I could choose who to share with. and don't share anything else; the contents of my wallet are always hidden unless I choose to reveal something; if I lose an important certificate, I have to ask the issueman to prove my identity and ask them to reissue it to me; my wallet can be carried with me wherever I go; if I don't like my wallet, I can change it and transfer it, it's portable; I usually don't make my own wallet but get it from the people who do it; without my consent. Wallet manufacturers can't monitor, modify or steal the contents of my wallet; if my wallet is stolen, thieves can't steal all my net assets, there's only so much cash, cards have limits, they'll be limited quickly, etc.; I shouldn't carry too many valuables at once; I have to be careful with my wallet to make sure it's safe.