Portable reviews that freelancers own across platforms
Intermediate16h2–3
EAS attestNext.jsViem
17/20Sybil-Resistant Product Reviews
Reviews that count only from verified unique buyers.
Advanced24h2–3 people16/20 fit
Build Sybil-Resistant Product Reviews for marketplaces and review sites in ~24h with 2–3 people. Stack: EAS attest + Solidity + Next.js.
Why it wins: Real problem with a credible approach.
Build flow
01 · Problem
Fake reviews from bot accounts mislead shoppers.
02 · Solution
Require a purchase attestation and a uniqueness proof before posting, weight reviews by reputation and show verification badges.
03 · Build
- 1Define schemas
- 2Gate review posting
- 3Weight by reputation
- 4Display badges
04 · Demo
Try to post a review without proof and get rejected.
MVP checklist
- Purchase attestations
- Uniqueness check
- Weighted scores
- Badges
Tech stack
| Tech | Role | |
|---|---|---|
| EAS attest | Onchain attestations | Chain |
| Solidity | Smart contracts | Chain |
| Next.js | Frontend + API routes | Web |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
Related ideas
More Web3Issue certificates anyone can verify onchain without calling the school
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