Issue certificates anyone can verify onchain without calling the school
Intermediate14h1–2
EAS attestViemNext.js
17/20Coffee Supply Chain Provenance
Scan a bag and see the farm, harvest and fair price paid.
Intermediate18h2–3 people17/20 fit
Build Coffee Supply Chain Provenance for ethical coffee brands and buyers in ~18h with 2–3 people. Stack: EAS attest + Next.js + QR codes.
Why it wins: Tangible story with web3 transparency.
Build flow
01 · Problem
Fair trade claims are hard to verify.
02 · Solution
Record each handoff as an attestation from farm to roaster, show a QR journey page and the share paid to farmers.
03 · Build
- 1Define schemas
- 2Record handoffs
- 3Render journey
- 4Show payments
04 · Demo
Scan a bag and walk through its journey.
MVP checklist
- Handoff attestations
- QR journey
- Farmer payment proof
- Map
Tech stack
| Tech | Role | |
|---|---|---|
| EAS attest | Onchain attestations | Chain |
| Next.js | Frontend + API routes | Web |
| QR codes | QR codes | Device |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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