We help you find and support open-source Bitcoin projects - helping create a better tomorrow, today.

General Fund

Funding nostr protocol development and other stuff.

The Nostr Fund

Contributions to the OpenSats Operations Budget will be used to cover our operating expenses as we continue to facilitate frictionless, tax-deductible donations from the community to the Bitcoin & FOSS ecosystems at a pass-through rate of 100%.

Operations Budget

A secure nostr chat client for iOS, Android, and desktop with encrypted DMs, groups, calls, and payments.

0xchat

A privacy-focused nostr client for Android with built-in Tor support.

Amethyst

A modular TypeScript SDK for building nostr web clients, extracted from noStrudel.

Applesauce

A modern, descriptor-based wallet library written in Rust.

Bitcoin Dev Kit

Bitcoin Core is the reference implementation of the Bitcoin protocol.

Bitcoin Core

Design resources for teams building better Bitcoin products.

Bitcoin Design Community

A self-custodial Bitcoin wallet on Spark, with easy onboarding from custodial to self-custody.

Blitz Wallet

A non-custodial Lightning wallet that runs a full LND node on your phone.

Blixt Wallet

A self-hosted, open-source Bitcoin payment processor with no fees and no third parties.

BTCPay Server

A Chaumian ecash protocol built for Bitcoin that brings near-perfect privacy to custodial payments.

Cashu

A modular Rust toolkit for building Cashu wallets and mints.

Cashu Dev Kit

A web-based nostr client focused on relay management and web of trust.

Coracle

A Bitcoin-only mobile wallet built on BDK with strong hardware wallet support.

Cove

A nostr client for iOS with Lightning zaps, relay transparency, and web-of-trust filtering.

Damus

An embeddable Bitcoin client in Rust that validates every block using Utreexo.

Floresta

A FROST-based threshold signing protocol for nostr with libraries and clients for multi-device keys.

Frostr

A hardened mobile operating system focused on privacy, security, and Android app compatibility.

GrapheneOS

A mobile Cashu wallet for Android and iOS, with Lightning, nostr, and offline token transfers.

Minibits

A non-custodial peer-to-peer Bitcoin exchange on Lightning and nostr with federated nodes and open clients.

Mostro

A modular TypeScript toolkit for building nostr applications, with first-class outbox-model support and reactive UI bindings for Svelte and React.

A Swiss nonprofit funding the development of open-source ecash systems built on Bitcoin.

OpenCash

A privacy-preserving batching protocol for Bitcoin transactions.

Payjoin

A nonprofit archive and publishing project dedicated to preserving Bitcoin history and ideas.

Satoshi Nakamoto Institute

Open-source software making nostr the best place to build and create on the social web.

Soapbox

Resize Lightning channels without closing them.

Splicing

An open mining protocol that gives individual miners more control over block construction.

Stratum V2

A global internship program for student Bitcoin contributors.

Summer of Bitcoin

Free software and open networks for online privacy, anonymity, and censorship resistance.

The Tor Project

A hardware-friendly Lightning signing stack that keeps private keys off the Lightning node itself.

Validating Lightning Signer

A nostr-based app store for signed releases, open discovery, and censorship-resistant software distribution.

Our Funds

Project Showcase