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Co-founders, on Bitcoin

Get behind builders.

Where Bitcoiners back each other’s projects. Post what you’re building and what you need: a co-founder, capital, or both. Everyone else can cosign it, joining as a co-founder or backing it as a patron.

No wallet needed to start. No ID asked. OC Cosign never holds your sats.

Get startedBrowse projects

If you’re building

Post your project and what you need. Find a co-founder who complements you, early backers, and honest signal on whether you’re onto something. You don’t have to be an engineer: domain experts, operators, designers and marketers are first-class founders here.

Post a project

If you back builders

Browse projects from real Bitcoiners, not an endless feed. Get behind the ones you believe in: join as a co-founder, or back as a patron. Any sats settle peer-to-peer, straight to the founder’s Lightning address. orangecheck never touches the money.

Browse projects

How it works

Join it, or back it.

Three steps. No résumé theatre, no cap-table paperwork, no custody.

  1. 01

    Post it, or find it

    Share what you’re building and what you need: a co-founder, capital, or both. Or browse projects worth your time.
  2. 02

    Cosign it

    Get behind a project: join as a co-founder, back it as a patron, or zap a little conviction. A cosign is a public act of support that counts.
  3. 03

    Build together

    When it’s mutual, a private intro opens. Any backing settles peer-to-peer over Lightning. Equity talk stays between you, off-platform, on your terms.

Why cosign

Real people, real conviction.

  1. Real people

    Your account is your Bitcoin identity. The room is real Bitcoiners with skin in the game, not throwaway profiles.

  2. No ID. Your sats stay yours.

    Start with just an email. Prove a Bitcoin address later for a verified badge if you want it. OC Cosign asks for no ID, never holds your keys, and never holds a single sat.

  3. Conviction, not clicks

    A cosign is a public act of getting behind someone: joining, backing, or zapping. It counts for something. It’s not a like.

Find the people you’ll build with.

Post a project, or get behind one. Join it as a co-founder, or back it as a patron. Either way, you put real conviction behind real people.

Get startedHow it works

With thanks to Bram Kanstein (opens in a new tab), whose work on Bitcoin as a sovereignty layer shaped the premise.