Prove a carbon credit was retired once and only once
Intermediate16h2–3
SolidityOpenZeppelinNext.js
17/20Community Shop Loyalty Points
Shared loyalty points that work across neighbourhood stores.
Beginner10h1–2 people17/20 fit
Build Community Shop Loyalty Points for local shops on one street in ~10h with 1–2 people. Stack: Solidity + OpenZeppelin + Next.js.
Why it wins: Local economy story.
Build flow
01 · Problem
Small shops cannot run loyalty programs like big chains.
02 · Solution
Shops issue points tokens for purchases that customers redeem at any member shop, with a simple shop dashboard.
03 · Build
- 1Deploy token
- 2Build shop app
- 3Handle redemption
- 4Settle
04 · Demo
Earn points at one shop and redeem at another.
MVP checklist
- Shared points
- Shop dashboard
- Redemption
- Settlement report
Tech stack
| Tech | Role | |
|---|---|---|
| Solidity | Smart contracts | Chain |
| OpenZeppelin | Audited contract library | Chain |
| Next.js | Frontend + API routes | Web |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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