The Mark Back to portal
Authentication & Provenance

The Mark

Every membership is a physical object with a verifiable history. The card opens the door, proves standing at the bar, and carries the sponsorship chain that produced it.

Carbon Members Club
Charter
Alicia Moreau
Member No. 88 · Since 2024
Mark IDCMC-0088-4F7A
Issued14 Feb 2024
SponsorMember No. 12
Chain depth3 from founding
Property of Carbon Members Club. Non-transferable without club approval. Found cards may be returned to 7822 Bonhomme Ave, Clayton MO 63105.
Tap the card to turn it over
Hold to read
Awaiting read

Chain of provenance

Every seat in the room traces back to a founding member
  • Marcus Ellery
    March 2023 · Member No. 01
    Founding member. Chain origin.
  • Kelly Chase
    April 2023 · Member No. 04
    Invited by No. 01 · accepted in 9 days
  • Alicia Moreau
    February 2024 · Member No. 88
    Invited by No. 04 · accepted in 4 days
  • M. Tran
    August 2026 · pending
    Invited by No. 88 · outstanding, 24 days
Card status
Active
Last read at the Bonhomme door, 9 Sep, 7:42 PM
Grants
Door · Bar · Locker 07
Guest privileges: two, resets monthly
Succession
Not designated
A member may name a successor, subject to club approval

How this actually works, and what it does not do

A printed QR code is not authentication. It can be photographed, reprinted, and presented by anyone — which makes it fine for a table menu and useless for a door. The Mark uses a secure NFC chip embedded in the card that generates a rotating cryptographic code on every read, verified server-side against the club's own key. A code that has already been used is dead. A photograph of the card proves nothing.

What it does not do: it does not replace a person at the door, it does not make a card impossible to lose, and it does not authenticate a member who hands their card to someone else. It makes a forged card impractical and a shared card traceable, which is the honest version of the claim.

The same chip and the same verification path run the bottle-locker sign-out and the guest register, so one credential covers the door, the bar, and the book.