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Each hall door has an enrolled phone. Delegates tap their badges going in, and the ledger records which badge entered which hall and when, without a scanner queue.
A registration desk that knows who arrived at the venue but not who sat through which session, and certificates issued on trust.
Every session has a list of badges and times, and the organiser decides certificate eligibility from evidence instead of a sign-in sheet.
Delegates collect plain NFC badges. Each is registered to the delegate at the desk.
Hall B's door phone records badge taps for the keynote. The venue Wi-Fi is overloaded; taps queue and catch up.
A delegate taps Hall C for a workshop. One delegate's taps across halls now read like an itinerary.
Speakers' badges were issued as visitor passes for day one only. On day two they are recorded and silent.
The organiser filters the ledger by phone, which is to say by hall, and exports attendance per session.
Recognised works on any chip, changed from the console. Written works on any phone, nothing installed. The two modes, explained
We set up a workspace that looks like yours and walk through this day on real cards. Thirty minutes, no slides.
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