Resale authenticity certificates
Hypothetical. Not a client, not a result.
// The problem
A sneaker and streetwear label sees its products resold every day beside counterfeits, and resale buyers have no way to check that an item is genuine or who owned it before.
// What we would build
A digital certificate issued as a token on a public chain when an item is sold, bound to its NFC tag, which passes to the next owner on resale, with a web page where anyone can check an item. If you only need a genuine-or-not check and never track resale, a signed record in your own database is simpler and cheaper, and we will say so.
// What is in it
- Certificate issued at sale and bound to the item's NFC tag
- Customers claim it with an email sign-in or their own wallet
- Transfer to the next owner when the item is resold
- Public check page, with no personal data on chain
- Smart contracts tested and independently reviewed before launch
- Admin to revoke certificates for returns and reported thefts
// Stack
- Solidity
- Base (Ethereum layer 2)
- Next.js
- NFC tags (NTAG 424 DNA)
- PostgreSQL
// estimate
- Build
- ≈ US$89,200 to US$136,000, delivered within 23 weeksCAD 127,000 to 194,300
- Hosting
- ≈ US$344 a monthCAD 490 a month
- Support
- ≈ US$2,500 a monthCAD 3,565 a month
Prices in your currency are estimates from today's Bank of Canada rate. All invoicing is in CAD or USD.
Timeline by milestone
- Discovery
- 2.9 to 3.4 weeks
- Specification
- 0.4 weeks
- Design approved
- 3.9 to 6.4 weeks
- Core features
- 1.4 to 2.4 weeks
- Full build
- 0.9 to 1.4 weeks
- Contracts and tests
- 1.9 to 3.4 weeks
- Testing and fixes
- 0.4 weeks
- Testnet deployment
- 2.9 to 3.4 weeks
- Launch
- 0.9 to 1.4 weeks
- Mainnet
- 0.9 to 1.4 weeks
Outside our hands, and added to the calendar
- An outside audit of the contracts, if you want one
- 2 to 4 weeks
How it is paid
- Deposit 20%
- CAD 25,400 to 38,860
- Discovery 3.5%
- CAD 4,445.00 to 6,800.50
- Specification 6.3%
- CAD 8,001.00 to 12,240.90
- Design approved 3.5%
- CAD 4,445.00 to 6,800.50
- Core features 10.5%
- CAD 13,335.00 to 20,401.50
- Full build 7%
- CAD 8,890 to 13,601
- Contracts and tests 19.1%
- CAD 24,257.00 to 37,111.30
- Testing and fixes 3.5%
- CAD 4,445.00 to 6,800.50
- Testnet deployment 6.3%
- CAD 8,001.00 to 12,240.90
- Launch 3.5%
- CAD 4,445.00 to 6,800.50
- Mainnet 6.8%
- CAD 8,636.00 to 13,212.40
- Holdback, 30 days after launch (10%)
- CAD 12,700 to 19,430