Project Showcase
In total, OpenSats has allocated $27,338,519 USD to free and open-source projects and sent ~31.2 billion sats to 319 grantees in 32+ countries.
This is only a small selection of projects that OpenSats has funded. For the complete list, see our grant announcements.
Privacy & Infrastructure
The plumbing that keeps the rest of the stack honest.
GrapheneOS
A hardened mobile operating system focused on privacy, security, and Android app compatibility.
Payjoin Dev Kit
The Rust library for Payjoin, with bindings for Python, Dart, Swift, Kotlin, JavaScript, and C#.
The Tor Project
Free software and open networks for online privacy, anonymity, and censorship resistance.
WireGuard
A lean VPN protocol and software suite for secure networking across servers, phones, and desktops.
Protocol Maintenance & Development
The full node, validation, and the protocol underneath.
ASmap
A project that builds reproducible IP-to-AS maps for Bitcoin Core so nodes can diversify peers across autonomous systems.
Bitcoin Core
The full node software that validates the chain, relays transactions, and enforces Bitcoin’s rules.
Floresta
An embeddable Bitcoin client in Rust that validates every block using Utreexo.
libbitcoin
A modular C++ Bitcoin toolkit with an alternative full node, server, explorer, and supporting libraries.
Splicing
Resize Lightning channels without closing them.
Stratum V2
An open mining protocol that gives individual miners more control over block construction.
utreexod
A fully validating Bitcoin node and bridge node implementation of the Utreexo protocol.
Validating Lightning Signer
A hardware-friendly Lightning signing stack that keeps private keys off the Lightning node itself.
Education & Research
People bringing in the next wave of contributors.
Bitcoin Design Community
Design resources for teams building better Bitcoin products.
Bitshala
A grassroots education initiative training open-source Bitcoin developers in India.
Satoshi Nakamoto Institute
A nonprofit archive and publishing project dedicated to preserving Bitcoin history and ideas.
Summer of Bitcoin
A global internship program for student Bitcoin contributors.
Developer Tooling & Testing
Libraries, kits, and workflow tools engineers use to build and ship.
Bitcoin Dev Kit
A modern, descriptor-based wallet library written in Rust.
Bitcoin Research Kit
A self-hostable Bitcoin analytics stack that indexes chain data, computes metrics, serves an API, and powers the public Bitview instance.
bitcoinfuzz
A differential fuzzing framework for Bitcoin protocol implementations and libraries.
Cashu Dev Kit
A modular Rust toolkit for building Cashu wallets and mints.
NDK
A modular TypeScript toolkit for building nostr applications, with first-class outbox-model support and reactive UI bindings for Svelte and React.
ngit
A git plugin and remote helper that puts repository state, pull requests, and issues on nostr, with normal git servers used as the data store.
rust-bitcoin
A low-level Rust Bitcoin library stack for protocol messages, transactions, scripts, keys, addresses, and PSBTs.
Wallets
Self-custody software people actually use.
Blitz Wallet
A self-custodial Bitcoin wallet on Spark, with easy onboarding from custodial to self-custody.
Blixt Wallet
A non-custodial Lightning wallet that runs a full LND node on your phone.
Cove
A Bitcoin-only mobile wallet built on BDK with strong hardware wallet support.
Dana Wallet
A mobile Bitcoin wallet built around silent payments, BIP353 addresses, and local scanning for private on-chain receiving.
Merchant Tooling & Payments
Payments, point-of-sale, and merchant tooling on Lightning.
BTCPay Server
A self-hosted, open-source Bitcoin payment processor with no fees and no third parties.
LNbits
A modular Lightning wallet account system with a plugin framework, used as the payments layer for shops, kiosks, hardware projects, and online services.
Mostro
A non-custodial peer-to-peer Bitcoin exchange on Lightning and nostr with federated nodes and open clients.
Chaumian ecash
Ecash wallets and mint software on Cashu.
Cashu
A Chaumian ecash protocol built for Bitcoin that brings near-perfect privacy to custodial payments.
Minibits
A mobile Cashu wallet for Android and iOS, with Lightning, nostr, and offline token transfers.
OpenCash
A Swiss nonprofit funding the development of open-source ecash systems built on Bitcoin.
Nostr Clients
How people read and post on nostr today.
0xchat
A secure nostr chat client for iOS, Android, and desktop with encrypted DMs, groups, calls, and payments.
Amethyst
A privacy-focused nostr client for Android with built-in Tor support.
Coracle
A web-based nostr client focused on relay management and web of trust.
Damus
A nostr client for iOS with Lightning zaps, relay transparency, and web-of-trust filtering.
Flotilla
A Discord-like nostr client built around the idea of "relays as groups," with chat, threads, events, voice rooms, and white-labeled instances.
Soapbox
Open-source software making nostr the best place to build and create on the social web.
Nostr Infrastructure
Relays, libraries, signers, and developer tooling.
Amber
A nostr signer for Android that keeps the nsec in one app and signs events for every other client over NIP-46.
Applesauce
A modular TypeScript SDK for building nostr web clients, extracted from noStrudel.
Citrine
A nostr relay that runs on your Android phone, used as a local cache and a private write target by other clients on the same device.
Frostr
A FROST-based threshold signing protocol for nostr with libraries and clients for multi-device keys.
Zapstore
A nostr-based app store for signed releases, open discovery, and censorship-resistant software distribution.