We do not require an attestation and things like token smuggling is still a problem we need to solve. We have a system that prioritizes unlinkability. So an issuer cannot track the attribute they give you. And a verifier cannot link multiple disclosures with the same attribute. This privacy really helps things like token smuggling however. Time-gated tokens may increase the difficulty, but will probably not make it impossible. Making it illegal to verify someone else's qr codes could also help of course.
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