Branteon
The product we run

Pullfy 

A digital marketplace for collectibles. People buy sealed packs of trading cards and open them; what comes out can be kept, exchanged back for points, or shipped as the physical card. The decision to ship happens after the reveal, not before it — so nothing is posted that its owner did not choose to receive.

Pokémon at launchBuilt for further categoriesOperated by Branteon LLC
The Pullfy shop, listing sealed Pokémon booster packs by set with a price and a points cost against each one.
Pullfy, running. Sealed packs listed by set, priced individually.
The mechanism

A draw nobody can check is a draw nobody should trust

What comes out of a pack is decided by a draw. So the result is committed before the pack is opened, and anyone can confirm afterwards that it was not changed. This is not reassurance bolted on at the end — it is the reason the category can be operated honestly at all.

  1. 01

    Commit

    A server seed is drawn and its digest is published before the pack is touched. The seed itself stays sealed.

    published digest2d66ba61270868920a6c3866ec2e40a1381ccafe196458a28506cd88728c516b
  2. 02

    Open

    The outcome is derived from that sealed seed together with a seed the buyer sets and a counter neither side controls.

    derivationserver seed · buyer seed · nonce
  3. 03

    Verify

    Afterwards the seed is released. Hashing it must reproduce the digest published beforehand, or the result was changed.

    released seedworked-example-server-seed
A worked example, not a record of an opening. The digest above is real: printf '%s' 'worked-example-server-seed' | shasum -a 256 returns it.
What a buyer holds

Packs, before anything is known

A bought pack sits in the account unopened, tagged with the batch it came from. Nothing about its contents is settled until it is opened, and the commitment covering it was published before it was bought.

A grid of unopened Pokémon booster packs in an account, each labelled with its set and the batch identifier it came from.
Packs held in an account, before opening. A development account — the inventory here was seeded, not sold.
The catalogue

Every card, priced and accounted for

A pack cannot be opened honestly unless what might come out of it is known first. Every card in a set is catalogued, priced against the market, and tracked from the batch it arrived in through to the address it leaves for.

Storage, picking and postage are carried out by specialist partners rather than by us. The record of what is owed to whom stays ours.

A card collection view: the full set catalogued in a grid, cards not yet owned shown desaturated and the owned ones in full colour.
An empty account against a full set. Grey is what has not been pulled yet.
Who runs it

Pullfy is designed, built and operated by Branteon LLC, which is also the seller of record for everything sold through it. The identification is on the legal information page, and what the company is and is not is on the home page.