Your Dice

What a die is here

A key fob with an NFC tag inside. You hold your phone to it, the app reads it, and the app produces a number. It is not a die you throw — there's no camera, nothing watching a physical object come to rest.

So the honest description of a roll is: the tag says which of your dice you meant, and the app rolls it. Everything below follows from that.

Claiming a tag

A phone job — reading and writing NFC needs the native app. Tap Scan RFID Dice, hold the phone to the tag, then name the die. The app reads the range off the tag to work out the sides. The web's Add New Dice button honestly just points you at the store.

Rules the server enforces:

• One owner per tag. If somebody else has it registered and active you get a conflict, not a duplicate.
• Removing a die doesn't burn the tag. Register it again later and your old record comes back, name and all. A tag whose previous owner deleted it counts as unclaimed.

What the app then knows

• /dice — your collection and your roll history, as two tabs. There's no roller here; rolling a die means picking one up.
• /dice/[id] — the die's own profile page. Give it a name and a picture, and read what it has actually been doing: how the throws fell across every face, the naturals at both ends, and what it averages.
• Ownership history — every die records who has held it and how it changed hands. Transfers and trades both need an NFC tap to complete, so provenance is backed by somebody physically having the object.
• A shareable page. You can mint a public link to a die's roll history for people with no account. One active link per die, revocable.