ACINQ
Company
A Paris company that maintains Eclair, one of the Lightning implementations, and ships the Phoenix wallet and phoenixd node alongside its own routing node.
Bisq
Open Source Project
Desktop software that lets two people trade bitcoin for national currency directly, with no company holding the funds and no account to open.
Bisq DAO
DAO
The governance and funding layer of the Bisq exchange, run through BSQ tokens that are coloured satoshis on the Bitcoin blockchain rather than a token on another chain.
Bitcoin Beach
Non-profit
A community project in El Zonte, El Salvador that used a single anonymous bitcoin donation to build a local economy where wages and everyday purchases move over Lightning.
Bitcoin Core
Open Source Project
The reference Bitcoin implementation: full-node validation software, an optional wallet, and the related cryptography libraries, released under the MIT licence.
Bitcoin Design Community
Open Source Project
An open community of designers that produces the Bitcoin Design Guide, a free reference for anyone building non-custodial Bitcoin products.
Bitcoin Dev Kit
Open Source Project
A suite of Rust libraries and language bindings for building Bitcoin wallets, stewarded by the Bitcoin Dev Kit Foundation, a United States 501(c)(6) non-profit.
Bitcoin Ekasi
Non-profit
A township project in Mossel Bay, South Africa that pays surf coaches entirely in bitcoin and onboards local shops so the wages can be spent without converting to rand.
Bitcoin Magazine
Media
The oldest publication devoted to Bitcoin, owned since late 2014 by BTC Media and now part of BTC Inc, a subsidiary of the listed company Nakamoto Inc.
Bitcoin Mining Council
Industry Body
A voluntary forum of large Bitcoin miners that published quarterly self-reported energy and hashrate surveys, with no public output since 2023 and no live website.
Bitcoin Optech
Industry Body
The Bitcoin Operations Technology Group, which publishes a weekly technical newsletter and runs workshops to help Bitcoin businesses adopt open source scaling techniques.
Bitcoin Policy Institute
Non-profit
A Bitcoin-only think tank that publishes policy research and briefs American legislators and regulators.
Bitrefill
Company
A Swedish company selling gift cards, phone top-ups, eSIMs and bill payments for bitcoin, and one of the earliest commercial users of the Lightning Network.
Block, Inc.
Company
A New York Stock Exchange listed payments company whose bitcoin work covers a hardware wallet, a mining system and a funded open-source team.
Blockstream
Company
A Canadian corporation that builds Bitcoin infrastructure, including the Liquid sidechain, the Core Lightning implementation and the Jade signing device.
Braiins
Company
A Prague company that operates the oldest bitcoin mining pool and builds mining firmware, management software and the Stratum V2 protocol.
Brink
Non-profit
A donation-funded United States non-profit that pays Bitcoin protocol engineers through grants and mentors new contributors through a fellowship programme.
BTCPay Server
Open Source Project
A free, self-hosted, non-custodial payment processor that lets a merchant accept Bitcoin on-chain and over Lightning without a company in the middle.
Btrust
Non-profit
A non-profit funded by a 500 BTC donation that trains and pays Bitcoin open-source developers in the Global South, with most of its programmes running across Africa.
Built With Bitcoin Foundation
Non-profit
A humanitarian organisation that funded schools, water projects and farms with bitcoin donations, and whose public presence has been dark since 2023.
Casa
Company
A US company selling multi-key custody software and support, where the customer holds keys and Casa holds one, plus inheritance tooling built on the same key set.
Chaincode Labs
Company
A privately funded Bitcoin research and development centre in New York that employs protocol engineers and runs education programmes for new contributors.
Coin Center
Non-profit
A Washington research and advocacy organisation that argues, in Congress and in court, that writing and running cryptocurrency software is protected speech.
Coinkite
Company
A Toronto hardware company that makes the Coldcard signing device along with Opendime, Tapsigner, Satscard and other Bitcoin-only security products.
Electrum
Open Source Project
A lightweight Bitcoin wallet released in 2011 that verifies its own history against block headers instead of downloading the whole chain, distributed by a Berlin company.
Foundation Devices
Company
A Boston hardware company that makes the Passport signing device and the Envoy companion app, with published hardware and firmware source.
Galoy
Company
The company behind the wallet that became Blink, now selling core banking software with Bitcoin and Lightning payments built in.
Human Rights Foundation
Non-profit
A New York human rights organisation whose Financial Freedom programme trains activists to use bitcoin and whose Bitcoin Development Fund grants money to open-source developers.
libsecp256k1
Open Source Project
The MIT-licensed C library that performs Bitcoin's elliptic curve signing and verification, maintained under the Bitcoin Core organisation.
Lightning Dev Kit
Open Source Project
A Rust implementation of the Lightning protocol packaged as a library, so an application can embed Lightning instead of talking to a separate node.
Lightning Labs
Company
A Delaware company that develops the Lightning Network Daemon and a set of liquidity and asset products built on top of it.
LNbits
Open Source Project
A free and open-source accounts system that sits on top of an existing Lightning funding source and splits it into wallets, APIs and extensions.
mempool.space
Open Source Project
An AGPL-licensed mempool visualiser and block explorer, run as a public instance and designed to be self-hosted on your own node.
MIT Digital Currency Initiative
Non-profit
A research group at the MIT Media Lab that funds Bitcoin Core developers and publishes research on both decentralised and central bank digital currency systems.
Mutiny Wallet
Company
A self-custodial Lightning wallet that ran a full node inside a web browser, shut down by its team at the end of 2024.
OpenSats
Non-profit
A United States public charity that passes donations through in full as grants to free and open-source contributors working on Bitcoin and adjacent freedom technology.
River
Company
A United States bitcoin-only financial services company that sells and custodies bitcoin, runs Lightning infrastructure, and publishes a proof of reserves.
SatoshiLabs
Company
A Prague holding company whose subsidiaries include Trezor, which shipped the first Bitcoin hardware wallet, and Tropic Square, which designs auditable secure elements.
SeedSigner
Open Source Project
A volunteer-run open source project whose software turns roughly fifty dollars of off-the-shelf parts into an air-gapped, stateless Bitcoin signing device.
Sovryn Bitocracy
DAO
The on-chain governance system that owns and upgrades the Sovryn lending and trading contracts on Rootstock, a merge-mined Bitcoin sidechain.
Sparrow Wallet
Open Source Project
A desktop Bitcoin wallet built on PSBT and open standards, supporting most hardware signing devices and connection to a user's own node.
Start9
Company
A Denver company that builds StartOS, an operating system for running a personal server at home, and sells prebuilt servers that ship with it.
Strike
Company
A custodial United States bitcoin app and payments API that settles over Lightning, operated by Zap Solutions.
Swan Bitcoin
Company
A United States bitcoin-only brokerage built around automated recurring buys, retirement accounts and a large volume of published educational material.
The Digital Chamber
Industry Body
A Washington trade association for digital asset companies, formerly the Chamber of Digital Commerce, funded by member firms rather than by donations.
Umbrel
Company
A home server operating system with an app store, sold preinstalled on its own hardware and installable free on a Raspberry Pi or an x86 machine.
Unchained
Company
An Austin company offering bitcoin-backed loans, retirement accounts and trading on top of a multi-key vault structure where the client keeps their own keys.
Voltage
Company
A Kansas company that runs Lightning nodes and payment infrastructure on behalf of businesses, including exchanges, wallets and payment providers.
Wasabi Wallet
Open Source Project
An MIT-licensed desktop Bitcoin wallet built around coinjoin, whose default coordination service was discontinued by its developer zkSNACKs on 1 June 2024.
ZEUS
Open Source Project
An AGPL-licensed mobile Bitcoin and Lightning wallet that either runs a node on the phone or drives a node the user already owns.