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| WATERMELON TOURMALINE FIBER NETWORKS :: ERROR 48 — CARD ACCESS     |
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WHAT THIS IS
Some pages on this network are opened by a physical card instead of a
password. Hold the card to a phone, the page opens. The fleet status
page is one of them:

     04202030.com/status/

WHAT A CARD IS
Each card is an NTAG 424 DNA tag written for one credential. The chip
holds per-card keys derived from the issuing tenant's master keyset, and
it signs every read, so the same response never comes out twice. A
photographed or copied link is worthless.

HOW A TAP OPENS A PAGE
  1. Hold the card to the phone. Nothing to install, nothing to type.
  2. The chip returns a dynamic response tied to its read counter.
  3. The verifier checks the signature, the counter and the card status.
  4. Only then is a grant issued — single-use, valid for a few minutes.
  5. The page spends the grant once, sets a session, and expires it.

WHAT IT REPLACES
A shared password on an internal page. There is nothing to write down,
nothing to forward, and revoking a card is one record rather than a
site-wide password change.

WHAT IT DOES NOT DO
A tap proves the card is present and genuine, not who is holding it.
It does not make the page behind it permanently available, either. A tap
that fails its checks gets an error page — never the page itself — and a
replayed tap is refused rather than answered.

ACCESS IS LOGGED
Every tap that opens a page is recorded against the card that opened it,
so "who came in" is a record of a physical object, not an opinion.

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