CoSign
Two wallets · one shared receipt

Make the moment mutual.

Write a small card for something you shared. Share the link. When the other wallet co-signs, the memory belongs to both of you.

Choose shared network Try the preview
No account No database Just your wallets
Interactive previewInteractive preview is preparing controls
Alex
Sam
BUILT

Open source lounge

We paired on the release flow and got it over the line.

Two wallets Public receipt No account Celo + Stacks
A mutual record in three moves

Small enough to use.
Meaningful enough to keep.

Write the card

Choose what happened and capture the moment in a few honest words.

Share the link

Send one clean link or let the other person scan your QR code.

Make it mutual

The second wallet co-signs. Both addresses now share the same receipt.

Made for real collaboration

Not a score.
A shared signal.

Use CoSign when the story belongs to more than one person.

Met

A conversation worth remembering.

Built

Something you made together.

Helped

Support that moved work forward.

Learned

Knowledge shared both ways.

Other

Your own mutual moment.

Try the whole idea

One tap changes the card.

The preview is simulated and never connects a wallet. Live app routes only show data read from their configured contracts.

Interactive previewInteractive preview is preparing controls
Alex
Sam
BUILT

Open source lounge

We paired on the release flow and got it over the line.

Choose your signal path

Same promise.
Two networks.

Mobile first

Celo

Open inside MiniPay and move from invitation to co-signature without another account.

Choose Celo
Bitcoin secured

Stacks

Connect your Stacks wallet and keep the same simple, public collaboration receipt.

Choose Stacks
Clear before you sign

Public means public.

Category, context, note, timestamps and participating wallet addresses are written to the selected network. They can be read by anyone and cannot be edited or deleted.

A good moment is already shared

Now make it mutual.

Choose shared network