This concept has been studied already extensively, e.g [1] (in 2000!) by people like Rivest and Chaum, who have actual decade-old competence in that field.
I think worldcoin added this year (?) identification using government e-passport as well (not only orb) - all modern passport have NFC/RFID chip, you won't get all data from that in public way but can verify signature and can get basic information. There are already apps in appstore doing that.
While that works for attacks that are like spam, bot detection for high margin attacks like show ticket scalping really wants an identity-oriented solution.
This is an extremely ignorant take. It's extremely well-known that one of the primary ways you stop spam is by making it economically infeasible, specifically by making the cost of distribution higher than the expected return. It's also extremely well-known that spam snail-mail is subsidized by the US post office and doesn't pay normal post rates.
Yup, Worldcoin has been the one of the efforts in this space. We're trying to have a frictionless, less privacy-invasive method than biometric scanning
This concept has been studied already extensively, e.g [1] (in 2000!) by people like Rivest and Chaum, who have actual decade-old competence in that field.
[1] https://people.csail.mit.edu/rivest/pubs/pubs/LRSW99.pdf