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Grants for BDK, LNbits, Nostr, and More!


After announcing our first wave of grants for bitcoin1 and nostr2 projects, we are pleased to announce an additional wave of grants for open-source projects in the space:

The first five grants are sourced from our General Fund, the last three—being nostr projects—from our Nostr Fund. This brings the total number of OpenSats grants to 41, adding to the grants we previously announced in July.

Once again, let's take a closer look at each of the projects to see how they align with the OpenSats mission.


Bitcoin Development Kit (BDK) is a set of libraries and tools that allows you to seamlessly build cross-platform on-chain bitcoin wallets without having to re-implement standard bitcoin data structures, algorithms, and protocols. BDK is built on top of the powerful rust-bitcoin and rust-miniscript libraries and adds features for managing descriptor-based wallets, syncing wallets to the bitcoin blockchain, viewing transaction histories, managing and selecting UTXOs to create new transactions, signing, and more. The core BDK components are written in Rust, but the team also maintains Kotlin and Swift language bindings for use in mobile projects. There are also Python bindings, and React Native and Flutter support is being actively developed.

Repository: bitcoindevkit/bdk
License: Apache 2.0 / MIT


LNbits is used by a multitude of projects in the bitcoin space, especially as part of their lightning payments stack. Being easy to build on through its extension framework, LNbits has been pioneering various cutting-edge solutions and experiments in the world of bitcoin, lightning, and nostr.

The project has a thriving maker community building various hardware devices such as Lightning ATMs, point-of-sale devices, DIY hardware wallets, and nostr signing devices. The modular design of LNbits makes it attractive to users and tinkerers alike, as its plugin architecture makes it easy to extend and understand.

Repository: lnbits/lnbits
License: MIT


watchdescriptor is a CLN plugin written in Rust that connects a business's treasury wallet to its CLN node. It utilizes cln-plugin and the BDK library to track coin movements in registered wallets and report this information to the bookkeeper plugin.

The plugin enables businesses to design a complete treasury using Miniscript and import the resulting descriptor into CLN. Since bookkeeper already accounts for all coin movements internal to CLN, this plugin is the last piece businesses need in order to unify all their bitcoin accounting in one place. This enables businesses to account for all inflows and outflows from their operations, streamlining tax reporting and financial analysis.

The watchdescriptor project is part of a broader vision to transform the lightning node (particularly CLN) into a financial hub for businesses, enabling them to conduct operations without reliance on any third parties.

Repository: chrisguida/watchdescriptor
License: MIT

Stratum V2 Testing & Benchmarking Tool

The Stratum V2 Testing & Benchmarking Tool allows the bitcoin mining industry to test and benchmark Stratum V2 performance against Stratum V1. The tool supports different mining scenarios to help miners make informed decisions and evaluate their profitability. The goal of the project is to motivate miners to upgrade to Stratum V2, increasing their individual profits and making the Bitcoin network more resilient in the process.

Repository: stratum-mining/stratum @GitGab19
License: Apache 2.0 / MIT

Fedimint Modules and Resources

Fedimint is a federated Chaumian e-cash mint backed by sats with deposits and withdrawals that can occur on-chain or via lightning. It can be understood as a scaling and privacy layer as well as an adoption accelerator for Bitcoin.

The goal of this particular project is to improve the Fedimint UI and develop free and open resources for developers and "Guardians" to enable more people to run and develop on Fedimint.

Repository: fedimint/ui @EthnTuttle
License: MIT

Amber: Nostr Event Signer

Amber is a nostr event signer for Android. It allows users to keep their nsec segregated in a single, dedicated app. The goal of Amber is to have your smartphone act as a NIP-46 signing device without any need for servers or additional hardware. "Private keys should be exposed to as few systems as possible as each system adds to the attack surface," as the rationale of said NIP states. In addition to native apps, Amber aims to support all current nostr web applications without requiring any extensions or web servers.

Repository: greenart7c3/Amber
License: MIT

Nostr UI/UX Development

The goal of this project is to help improve the UI/UX of major nostr clients, starting with Gossip and Coracle, emphasizing the onboarding process as well as usability and accessibility. One part of onboarding is solving the discoverability problem that nostr has in the first place. Solving the problem of jumping in and out of the nostr world is what motivated the development of njump, which was redesigned as part of these efforts and is now live at

In addition to client-specific improvements, generic design modules and learnings will be incorporated into the Nostr Design project for others to use.

Activity: @dtonon
License: MIT

Nostr Use-Case Exploration & Education

As of today, most nostr clients implement social media applications on top of the nostr protocol. However, nostr allows for various use cases, many of which go beyond social media. Two examples are Listr and Ostrich, a list management tool and job board, respectively.

In addition to use-case exploration, this project will continue to educate users and developers alike, be it via Nostr How or various video series, e.g., explaining how to build upon NDK.

Activity: @jeffg
License: MIT / GPL-3.0 / CC BY-NC-SA 4.0

We have more grants in the pipeline and will provide funding for many more projects in the future. Note that we can only fund those projects which reach out and apply. If you are an open-source developer who is aligned with our mission, don't hesitate to apply for funding.


  1. First Wave of Bitcoin Grants

  2. First Wave of Nostr Grants