Jejak: a field dex where every bird you spot becomes a card you can trade

Description and use

Jejak turns a bird photo into a collectible card, giving tourists and guides a tangible experience and a new revenue stream, using an open-weight vision model.

Problem

Identification apps stop at the answer; users never record or keep a tangible artifact of their sightings, so there is no incentive to revisit or share the experience.

Outcome

Jejak transforms a simple photo into a collectible card, providing a tangible artifact for birdwatchers and a new revenue channel for nature guides. The use of an open-weight vision model keeps marginal costs low, enabling a subscription model that scales with guide success.

Workflow

• 1. Guest takes a photo of a bird.
• 2. Photo is uploaded to the app; a 1024px copy is sent to the model, only a 320px thumbnail is stored.
• 3. The model identifies the species, grounds it against the glossary, and writes a bilingual field note.
• 4. If confidence ≥60%, the catch succeeds; otherwise the user can pay credits to re‑analyse.
• 5. A card is created with rarity and live value calculated from scarcity.
• 6. The card can be shared on a feed or sold on the market board.
• 7. Guides can subscribe for a small monthly fee per guide, with marginal cost near zero due to open-weight model usage.

Evidence

You photograph something alive, an open-weight vision model identifies it against a forkable species glossary, and the result becomes a collectible card with a rarity and a live value.

Source

The model does not free-associate a species name. data/glossary.spesies.json is a plain, forkable, CC-BY list of around 65 Indonesian species, and the model has to pick from it.

Source

Below 60% confidence the model is instructed to say so, the catch fails, and the keeper walks away with nothing — or pays 50 credits to re-analyse the same photo.

Source

Full-resolution photos never reach the server. The GPS read happens locally with exifr and the JPEG is re-encoded through a canvas, which destroys the whole EXIF block on the phone.

Source

The business only works because the model is open.

Source