Entities Overview
Profiles of the projects, organizations, and software in the Bitcoin ecosystem. Each entry covers what the entity does, how it fits into the broader landscape, and where to learn more.
Alby
Browser extension for Bitcoin Lightning payments and Nostr signing. Provides a non-custodial wallet with seamless web integration via the WebLN standard.
Axe Os
AxeOS is the primary open-source firmware for BitAxe miners. It replaces factory firmware to provide lower latency, better pool compatibility, and advanced configuration options including DATUM support.
Azteco
Azteco is a bitcoin voucher system for low-KYC onboarding. Buy a printed or digital voucher with cash or card, then redeem to any bitcoin address with no account registration.
Base58
A Bitcoin protocol education organization offering intensive, in-person bootcamps focused on Bitcoin Core, transactions, and protocol fundamentals. Named after the Base58Check encoding scheme used in Bitcoin addresses.
Bisq
Bisq is a decentralized, peer-to-peer exchange for buying and selling bitcoin with national currencies or other cryptocurrencies. No account creation, no KYC, no central server — trades are coordinated over Tor and settled via 2-of-2 multisig escrow with a third-party mediator.
Bitaxe
BitAxe is an open-source, low-power Bitcoin ASIC miner designed for home mining. It bridges the gap between industrial-scale equipment and hobbyist participation in network security.
Bitcoin Commons
Community space and event venue in Austin, Texas, focused on Bitcoin education, networking, and public discourse.
Bitcoin Core
Bitcoin Core is the reference implementation of the Bitcoin protocol. Originally released by Satoshi Nakamoto in 2009 as "Bitcoin," it remains the most widely used, reviewed, and trusted node software.
Bitcoin Knots
Bitcoin Knots is an enhanced full-node implementation of Bitcoin, maintained by Luke Dashjr. It builds on Bitcoin Core with additional privacy, decentralization, and mining-related features.
Bitrefill
Bitrefill sells gift cards, mobile top-ups, and bill-pay vouchers for bitcoin and Lightning payments. It bridges the gap between the bitcoin economy and traditional retail.
Blockstream Green
Blockstream Green is a mobile and desktop Bitcoin wallet with optional 2FA multisig and hardware wallet integration.
Bluewallet
Mobile Bitcoin wallet for iOS and Android. Supports both on-chain and Lightning. Originally included a custodial Lightning option; shifting toward non-custodial with Lightning Dev Kit (LDK) integration.
Bolt Card
Lightning-enabled NFC card for tap-to-pay Bitcoin transactions. Originally from CoinCorner; compatible with third-party Bolt Card Hub services.
Braiins Hashpower
On-demand SHA-256 hashrate marketplace launched by Braiins in January 2026 (public beta). Miners buy and sell hashrate through a live order book without long-term contracts or hardware ownership.
Breez
Mobile Lightning wallet for iOS and Android. Built on Flutter. Non-custodial, Lightning-native, and includes a built-in marketplace plus point-of-sale (POS) support.
Btcmap
Open-source project mapping Bitcoin-accepting merchants and locations worldwide. Community-driven data using OpenStreetMap as the base layer.
Btcpay Server
Self-hosted, open-source payment processor for Bitcoin. Accept on-chain and Lightning payments without relying on third-party custodians.
C Lightning
Core-Lightning (CLN, often called c-lightning) is a lightweight, modular Lightning Network implementation. It is notable for early support of Bolt 12, which enables static Lightning offers for automated recurring payments.
Caravan
Open-source multisig coordinator by Unchained Capital. Web-based tool for building and managing multisig transactions without installing software.
Casa
Fee-based collaborative custody service providing managed multisig vaults and personal security consulting.
Casdcr
A decentralized AI service platform built on the Bitcoin Lightning Network. CASCDR provides private, pay-as-you-go AI tools for content creators, using Lightning payments to preserve user privacy and enable permissionless access.
Cashu
Cashu is a free and open-source Chaumian ecash system built for Bitcoin. It lets users hold and transfer ecash tokens offline, settling against the Lightning Network when needed. Nobody needs to know who you are, how much you hold, or with whom you transact.
Coinatmradar
Directory and map of Bitcoin ATMs worldwide. Use to locate nearby machines for cash-to-bitcoin purchases.
Coldcard
ColdCard is a hardware wallet for advanced users prioritizing security verification, air-gapped signing, and open-source principles. Manufactured by Coinkite, widely used in multisig setups.
Comparepower
Electricity plan comparison marketplace for Texas. Aggregates rates across multiple providers with zero fees to the user.
Datum
DATUM (Decentralized Template Auction Machine / UTXO Manager) is a protocol that lets miners build custom block templates directly on their own node and submit them to a mining pool—without the pool dictating what transactions go into the block.
Electrum
Electrum is one of the oldest Bitcoin wallets, using SPV to verify transactions without downloading the full blockchain. Its server implementation (ElectrumX, Electrs, Fulcrum) is widely bundled with node packages.
Feed Filter
A user-controlled AI filter for social media feeds. Developed by Ted Thayer at Pleb Lab, Feed Filter restores "mental sovereignty" by letting users algorithmically control which posts they see, countering engagement-optimized algorithms that prioritize rage and conflict.
Fold
Fold is a bitcoin rewards company offering a debit card and app for earning sats-back on everyday purchases.
Hash Rate Index
Data and analytics platform for Bitcoin mining. Tracks miner revenue, profitability, power consumption by rig, and historical ASIC pricing.
Hashguard
DIY Python auto-optimizer for the Braiins Hashpower marketplace. Monitors the order book, detects stalled bids, and automatically adjusts pricing to maintain hashrate flow while minimizing overpayment.
Hashrate Autopilot
Official automation tool from Braiins for managing hashrate bids on the Braiins Hashpower marketplace. Rules-based engine that buys hashrate when price crosses thresholds and auto-rebalances between pools.
Hodl Up
Bitcoin mining-themed board game. Teaches proof-of-work concepts, mining economics, and hodling strategy through physical gameplay.
Hodlhodl
HodlHodl is a non-custodial, peer-to-peer bitcoin exchange platform. Unlike Bisq, it is web-hosted rather than fully decentralized, but it remains non-custodial through 2-of-3 multisig escrow.
Hwi
Command-line tool and Python library for connecting hardware wallets to Bitcoin Core. Enables direct signing with devices like Trezor, Ledger, and Coldcard without trusting intermediary software.
Ibexpay
Merchant payment processor for accepting Bitcoin via Lightning and on-chain. Targets businesses from single-location shops to multi-location chains.
Jade Diy
Jade DIY is Blockstream's open-source firmware for the Blockstream Jade hardware wallet, made available for installation on compatible off-the-shelf hardware. The project lets users build and verify their own Jade-compatible signing device from generic components.
Joinmarket
Decentralized CoinJoin marketplace. Uses a maker-taker model where liquidity providers (makers) earn fees for providing inputs to CoinJoin transactions, while privacy seekers (takers) pay for the service.
Kaboom Racks
ASIC mining hardware marketplace. Sells refurbished and used miners, often at prices accessible to home miners.
Krux
Krux is open-source firmware that enables anyone to build a Bitcoin signing device from off-the-shelf parts. It runs on cheap, general-purpose microcontrollers (e.g. M5StickV, Maix Amigo, Maix Dock) and turns them into air-gapped signing devices.
Ledger
Ledger is a hardware wallet manufacturer using secure element (SE) chips to protect private keys. One of the most widely sold hardware wallets globally.
Lnbits
An open-source Lightning accounting system that sits on top of a Lightning node. Provides a web interface, wallet system, and extensions for building Lightning-powered applications.
Muun
Self-custodial Bitcoin wallet with a hybrid Lightning/on-chain model. Uses submarine swaps to enable Lightning payments without the user managing channels directly.
Mynode
MyNode is a plug-and-play Bitcoin node OS similar to Umbrel, bundling Bitcoin Core, LND, Electrum, BTCPay, JoinMarket, Whirlpool, and more.
Nunchuk
Mobile-first Bitcoin wallet focused on multisig and collaborative custody. Designed for shared vaults and inheritance planning.
Nutstash
Web-based Cashu ecash wallet. Enables users to hold and transfer Chaumian ecash tokens backed by Lightning Network bitcoin.
Ocean Xyz
Ocean.xyz is a Bitcoin mining pool that emphasizes transparency, non-custodial payouts, and miner sovereignty through the DATUM protocol.
Opennode
Bitcoin payment processor for businesses. Settles payments via Lightning and on-chain with an API, e-commerce plugins, and hosted payment pages.
Oshi App
Bitcoin rewards and marketing platform for local businesses. Replaces traditional loyalty stars, punch cards, and points with bitcoin-backed incentives.
Payjoin Dev Kit
Open-source SDK for building Payjoin (BIP 78) functionality into Bitcoin wallets and applications. Maintained by Dan Gould.
Phoenix
Self-custodial Lightning wallet by ACINQ. Designed to abstract channel management from the user while keeping keys on-device.
Plebdevs
A Bitcoin developer education initiative founded by Austin (@bitcoinplebdev) that teaches plebs to become technical builders on Bitcoin, Lightning, and Nostr. Operates out of PlebLab in Austin, TX.
Pleblab
PlebLab is an Austin-based Bitcoin education initiative home to PlebDevs, a program that teaches Lightning and Bitcoin app development to beginners.
Polar
A one-click Lightning Network simulator for local development and testing. Runs inside Docker and lets developers spin up private networks with multiple node implementations without touching mainnet.
Public Pool
public-pool.io is a zero-fee, open-source solo mining pool. Instead of sharing rewards across participants, every connected miner hashes independently against the network difficulty—if you find a block, you keep the entire reward.
Raspiblitz
RaspiBlitz is a DIY Bitcoin Lightning node project built for education. Unlike commercial plug-and-play nodes, it emphasizes learning the underlying tools.
Robosats
RoboSats is a peer-to-peer exchange for buying and selling bitcoin using Lightning Network payments. It operates entirely over Tor and uses temporary robot identities, meaning users do not accumulate persistent trade history or reputation.
Ronindojo
Privacy-focused Bitcoin node operating system. On-chain only, with integrations for Whirlpool (CoinJoin) and Bisq.
Sahil Chaturvedi
Bitcoiner, designer, and advocate for the #GetOnZero philosophy. Presented the Zero Dollar Manifesto at Round Rock Bitcoiners Meetup #24.
Samourai Wallet
Privacy-focused Bitcoin wallet for Android, built around on-chain transaction privacy. The project was the origin of several privacy tools later adopted across the ecosystem.
Sats Card
NFC-enabled physical card from Coinkite functioning like a re-usable OpenDime. Load bitcoin onto it and transfer via NFC tap.
Seedsigner
Open-source, DIY Bitcoin signing device built from commodity hardware. Designed for air-gapped seed generation, transaction signing, and multisig coordination without trusting proprietary hardware.
Shushminer
Manufacturer of sound-dampening enclosures for Bitcoin ASIC miners. Targets residential miners who need to reduce noise without custom fabrication.
Simple Proof
Bitcoin-based document timestamping service that anchors cryptographic hashes of digital records to the Bitcoin blockchain, creating tamper-proof proof of existence and authenticity.
Sparrow Wallet
Sparrow Wallet is a desktop Bitcoin wallet focused on privacy, security, and flexibility. It supports single-sig and multisig setups and is designed for users who want full control over their coins and connections.
Specter Desktop
Open-source DIY multisig coordinator for Bitcoin. Runs as a desktop application with optional hardware wallet integration.
Specter Diy
Specter DIY is an open-source, do-it-yourself hardware wallet project from the Specter suite. It turns commodity hardware into an air-gapped signing device that pairs with Specter Desktop for multisig and single-sig custody.
Start Os
StartOS (formerly Start9OS) is a Debian-based operating system designed specifically for self-hosting Bitcoin and Lightning infrastructure. It packages complex services into one-click installs with automatic Tor and LAN access.
Stonewall
Stonewall is a single-user privacy feature in Samourai Wallet that creates transactions resembling mini CoinJoins but without multiple parties. It confuses chain analysis heuristics.
Stowaway
Stowaway is a collaborative transaction privacy feature in Samourai Wallet based on PayJoin (BIP-78). Two users construct a transaction together, breaking the common-input-ownership heuristic.
Stratum V2
Stratum V2 (Sv2) is a next-generation mining protocol that addresses the centralization risks inherent in the original Stratum protocol by giving miners control over block template construction.
Strike
Consumer-friendly Bitcoin and Lightning payment application. Allows users to buy, sell, and send bitcoin with a focus on simplicity and low fees.
Tapsigner
NFC-enabled card from Coinkite storing a Bitcoin private key. Sign transactions by tapping the card to your phone.
Trezor
Trezor is a hardware wallet developed by SatoshiLabs. The first commercial hardware wallet (2014), known for fully open-source firmware.
Umbrel
Umbrel is a plug-and-play Bitcoin node OS designed for Raspberry Pi and x86 mini PCs. It bundles Bitcoin Core, Lightning implementations, and a growing app store.
Unchained Capital
Collaborative custody provider and financial services company focused on bitcoin-native products.
Upstream Data
Bitcoin mining infrastructure company founded by Steve Barbour. Best known for the Ohmm BlackBox: a sound-attenuated, weather-resistant enclosure for ASIC miners.
Wasabi Wallet
Privacy-focused Bitcoin desktop wallet with built-in CoinJoin coordination by default. Uses the WabiSabi credential protocol for CoinJoin transactions.
Whirlpool
Whirlpool is a zero-link CoinJoin implementation developed by Samourai Wallet. It breaks deterministic links between inputs and outputs, improving on-chain privacy.
Zeus
Mobile Lightning wallet and node management app. Connects to your own Lightning node (LND, Core Lightning, or Eclair) remotely, giving you full control without running a node on your phone.