Something like a cert chain, but it would need to be both simple to use and secure. Those two requirements are greatly at odds with each other.
replyYeah one reason I think the government has to offer this is usability. While you can imagine a purely p2p protocol between cypherpunks, for everyone else there needs to be a way to social workers, DMV staff, etc can deal with edge cases (such as your id being stolen and needing a reset). Furthermore it helps if it's super illegal to tamper with this network (consider how rare check fraud is, despite being easy).
replyYes that's the idea, once you have the soul-bound eID the ZK part is trivial, but the eID with the guarantees I outlined is not at all trivial.
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