I assume it would be both jus soli and jus sanguinis
If you a born there, you were a Californian Citizen.
If you were there when they declare independendence, you were a Citizen (similar to the US Constitution, where everyone became citizen of the US if they were in tge 13 colonies at the moment it came into force, even if they just arrived from England).
If weren't there when they ratify the New Californian Republic Constitution, and you weren't born there, and you don't have parent's born there, then you'd probabaly not be a citizen.
They'll probably also look at CA state tax record and might give citizenship if you've lived there for X amount of years preceeding the ratification of the Californian Constitution.
I think its also possible California doesn't become an independent country, but form a different "United States" with other Blue states.
In China, they have Wechat Wallet that people can give money to homeless people. Even homeless people have phones.
It is nasty and dystopian, I agree. But its not really a fantasy anymore, its real, the dystopian future is on the horizon. Soon, it'd be too late to stop the dystopia.
At first, mass surveillance cameras is only in China, but then even supposed "democracies" like the UK have millions of cameras. Then China became mostly cashless, that will also eventually happen to western countries.
The dystopia is coming. You can't stop it.