How it works
How ChainChum works
Real art from real people, paid for by card, shipped to your door, with an NFT certificate of authenticity that records it forever. No crypto wallet, no gas fees.
The life of a piece
Every original and numbered print follows the same path, from the studio to its first owner and on to the next.
01
Made by hand
An artist or parent photographs a real piece.
02
Checked
Photos are screened for AI images. Sellers are verified adults.
03
Listed
It goes live with a price, shipping and a Human-made badge.
04
Certified
The work's one-time $1 certificate fee comes out of its first sale. ChainChum mints the NFT on Base and pays the gas.
05
Bought by card
The buyer pays by card, Apple Pay or Google Pay.
06
Resold or inherited
The same NFT moves with the piece, recorded free. The artist earns a royalty.
Buying on ChainChum
Shop like any online store. The NFT comes with the art automatically.
Find a piece you love
Browse by category, price or family art, or search by artist and tag.
Check what you are buying
Badges show Human-made, Original or the edition number, like 3 of 25. Every shop belongs to a verified adult.
Pay by card
Card, Apple Pay or Google Pay in US dollars. No buyer fee, no certificate fee and no gas fee.
Track the delivery
The seller ships the real piece. Follow it from your account.
Get your NFT certificate
A PDF by email, a QR code and a public verify page. ChainChum keeps the token in a wallet for you; export it to your own only if you want to.
Selling on ChainChum
List from your phone in minutes. Nothing to pay upfront: a $1 certificate fee per work comes out of its first sale, and 5% when you sell.
Sign up and confirm you are 18+
Email or Google sign-in. No wallet or crypto.
Open your shop
A name, a short bio and your shipping settings. Free.
Photograph and list
The listing assistant drafts a title, medium and tags. You edit and approve everything.
Set your price
The editor shows what you receive, 95% of every sale, and the $1 certificate fee that comes out of the first sale.
Sell, ship and get paid
The work's NFT certificate transfers to the buyer, its QR code goes on your packing slip and you are paid to your bank.
Family art
Keep every drawing, sell the favourites, and keep your child's identity private.
Save every piece in the Art Vault
A private archive of everything your child makes. Nothing in it is public.
Pick favourites to sell
Tag them Family art. Say "painted by my 7-year-old", never a name, face or birth date.
Family and friends buy by card
You receive 95%, and each piece's NFT certificate transfers to them.
ChainChum is for adults 18 and older. The parent is the seller; children never have accounts.
The NFT certificate, explained
A public, permanent record of who made a piece and who holds it, minted once when the work is published (handmade and digital pieces: when each one sells) and updated free at every sale.
What each NFT certificate records
- Title, medium, size and edition number
- The artist and their shop
- Issue date and a unique certificate ID
- A content hash: a fingerprint of the details and photos
- Every sale, resale and inheritance on ChainChum
ChainChum · Certificate of authenticity
Sunflowers at dusk
Acrylic on canvas · 40 × 50 cm · 1 of 1
Certificate CC-7F3A-21
Base (Ethereum layer 2) · ERC-721
Record matches
What is live today
Live now
Browsing and search, shops, listings with photo screening, the Art Vault and family art.
Rolling out in the pilot
Card checkout, payouts, NFT certificates on Base, printed certificates and stickers.
Questions
Is ChainChum an NFT marketplace?
No, it is an art marketplace. Every work sold on ChainChum comes with an NFT certificate of authenticity recorded on Base, but you buy the piece, the NFT is its record, and tokens are never traded on ChainChum.
Do I need a crypto wallet or coins?
No. You sign in with email or Google and pay by card. ChainChum mints the NFT, pays the network fee and keeps it in a wallet for you. You can export it to your own wallet later, and trade it elsewhere if you want to.
What does it cost?
Buyers pay the price, shipping and any sales tax, with no buyer, certificate or gas fee. Sellers pay a one-time $1 certificate fee per work, taken from its first sale, and ChainChum keeps 5% of each sale, card processing included.
Can I sell AI-generated art?
No. Every photo is screened for AI-generated images and listings that raise questions are reviewed by a person before they go live.