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I believe Utah is the only US state where you can carry your ID digitally on your phone and use it to buy alcohol or give it to police during a traffic stop. If California moves in that direction, it will be a big deal; soon we could leave home with just our phone without any analog cards.

For those who don't know, Digilocker is a govt initiative.

Also, it is opt-in and not mandatory. If you don't want to use it then don't bother. Nobody will force you to install the app or attach it with any of your docs.

Some European countries already had such apps for years too, although we're still waiting for EU-wide system to be adopted.