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Why do you suggest leaving this information with the government, again?

I'm not sure how it goes in USA but in the countries I know when the child is born his/her name gets registered at government office and when the child reaches 18 he/she gets plastic card that is his/her proof of identity.

I think this id card should contain private key securely embedded and public key easily readable and that government should publish public keys. To avoid leaking of private key this ID card should be able to cryptographically sign given data without revealing private key.

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