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Sharing Identity information.

With the exception of situations like tying identity to a boarding pass, any interaction (including payments) should be a anonymous as cash. Payment system retained payment record &identity data should be confidential to the user unless they expressly consent.

Proof-of an identity attribute (age) or certificate (valid passport from 《jurisdiction》) vs sharing. Ideally biometrics proofs are done by your device (with appropriate crypto signatures) which exchanges the proof record to the requesting party vs a gov face-recognition system.

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