oc · cosign
cofounders, 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: join as a co-founder, or back it as an investor.

no wallet needed to start · no KYC · no custody

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, not “idea guys”.

if you back builders

Browse curated projects from real Bitcoiners — not an infinite firehose. Get behind the ones you believe in: join as a co-founder, or back as an investor. Any sats settle peer-to-peer, straight to the founder’s Lightning address. OC never touches the money.

§ how it works

join it, or back it.

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

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.

02

cosign it

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

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, your terms.

§ why cosign

real people, real conviction.

real people

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

no kyc, no custody

Start with just an email. Prove a Bitcoin address later for a verified badge if you want it. We never hold your keys — and never custody a single sat.

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 an investor. Either way, you’re putting real conviction behind real people.

Built on the idea of Bitcoin as a sovereignty substrate, with thanks to Bram Kanstein ↗.