Docs

Everything you need to know about Chaincard, no whitepaper required.

What is Chaincard?

Chaincard is an on-chain business card on Solana. You claim a name, design a card (avatar, bio, links, colors, background), and the whole thing gets inscribed directly on chain. Not a link to a server. Not IPFS. The actual bytes live on Solana, forever.

If this website disappeared tomorrow, your card would still exist and anyone could read it straight from the chain.

How minting works

Claim a name. Names are registered in an on-chain registry program. One wallet per name, first come first served. The claim fee is 0.15 SOL.
Build your card. Pick a theme, set your display name, bio, and links, tweak colors, upload a background.
Inscribe it. Your card data is written to the chain in chunks. Bigger cards (like GIF backgrounds) take a few more transactions, but it all ends up on chain.

Once inscribed, the card is permanent. There is no delete button, because there is no server to delete it from.

Verify a card without this site

Trust, but verify. Every name maps to a deterministic address (a PDA) that anyone can derive from just the name and the program id. In plain language: given a name like degenkev, there is exactly one spot on the chain where its record can live, and you can compute that spot yourself.

The technical bit:

PDA = findProgramAddress(
  seeds = ["name", "<yourname>"],
  programId = 4SpRPoj6MV6o2g6yYBuJwdE8kvxZ83gxEoLfwDYAnNsw
)

The name record stores the owner wallet and the mint of the inscribed card. Look up either address on solscan (devnet for now) and you can confirm ownership and read the card data with zero help from us.

The marketplace

List: the name owner sets a price in SOL. The listing lives in the same on-chain record, no escrow server.
Delist: the owner can pull a listing any time before it sells.
Buy: pay the listed price and the name (and its card) transfers to your wallet. A 2.5% fee comes out of the sale.

Buys are protected against front-running: the price you confirm is the price you pay. If the seller changes the listing between your click and your transaction landing, the buy fails instead of charging you a different amount.

Customization

Backgrounds: upload an image, or an animated GIF up to 100kb. Yes, animated, yes, on chain.
Colors: set your name color, bio color, and card color, from the site palette or a full custom picker.
Themes: pick a base theme and override whatever you want on top.

FAQ

Can cards be deleted?: No. Once inscribed, the data is on chain permanently. Think before you mint.
What happens if the site goes down?: Nothing happens to your card. All data is on chain; the site is just a viewer. Anyone can rebuild a reader from the program id.
Who owns a name?: One wallet per name. The owner can transfer it by listing it on the marketplace, where anyone can buy it.

About

Chaincard exists because business cards die in drawers and link-in-bio pages die with their startups. A name and a card that live on Solana do not depend on anyone keeping a server bill paid.

Currently on devnet. Program id: 4SpRPoj6MV6o2g6yYBuJwdE8kvxZ83gxEoLfwDYAnNsw

Mint yours