Prove a carbon credit was retired once and only once
Intermediate16h2–3
SolidityOpenZeppelinNext.js
17/20Transparent Donation Tracker
Shows donors exactly where each donation was spent.
Intermediate24h2–3 people15/20 fit
Build Transparent Donation Tracker for ngos and donors in ~24h with 2–3 people. Stack: Solidity + viem + Next.js + Charts.
Why it wins: Trust and transparency people can see.
Build flow
01 · Problem
Donors don’t trust where money goes after they give.
02 · Solution
Donations and spending are recorded on-chain with receipts; donors see a live flow diagram.
03 · Build
- 1Donation contract
- 2Spend records
- 3Flow visualization
- 4Public page
04 · Demo
Donate on testnet → NGO logs a spend → donor sees the money flow update.
MVP checklist
- Donate
- Spend logging with receipt
- Money-flow diagram
- Public ledger
Tech stack
| Tech | Role | |
|---|---|---|
| Solidity | Smart contracts | Chain |
| viem | Ethereum client | Chain |
| Next.js | Frontend + API routes | Web |
| Charts | Data visualisation | UI |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
Related ideas
More Web3See treasury holdings, spending and runway in one view
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