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zkemail, do you know that team? https://prove.email/
this is just a first step, there is more to their plans than this alone.

have you seen something like a zk login system, where i can prove i have an active paid account without disclosing who i am (via login form, ignoring other tracking mechanisms for now)?

always seemed like publications that talk about valuing privacy would use a subscription/auth system like that if it was drop in easy 