Challenges May 2020

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Projects with Challenges

This is the list of Lightning Network related projects that registered for the HackSprint so far:


Github issues with label "hackathon":

Chatroom to get started:


Chatroom to get started:

In a push to get lnbits new update out and extend its functionality, x3 0.03btc bounties are available for anyone developing extensions. If you're interested in making an extension, pop into the stream for a chat. If the community likes the idea, you can make it and on completion get one of the bounties!

see video:

RTL (Ride The Lightning)

Github issues with label 'hackathon':

Chatroom to get started:

Quickening - Room77 Point of Sale

Github issues starting with "Room77"

Please work on the branch"payment_connector" use the version in the folder "TheQuickening"

Chatroom to get started:



Chatroom to get started:


Quickinfo on Specter:


Chatroom to get started:


A service to give a Lightning node running behind TOR a port on a public IP address.

Subpage with Challenge: TOR2IP-Tunnelservice

Chatroom to get started:

SendMany App

Project Info:


Chatroom to get started:

Wiki Lightning Spam Protection

Turn this prototype to add a Lightning SpamProtection into a Media Wiki Extension thats easy to install and config on a standard Media Wiki.

Chatroom to get started:

The Eye of Satoshi (python-teos)

The Eye of Satoshi is a Lightning watchtower compliant with BOLT13, written in Python 3.

Github issues with label "hackathon":

Chatroom to get started:

Exchange Union/OpenDEX

Integrate c-lightning as swap client (and more):

Chatroom to get started:

getroutevia: a c-lightning plugin for route search with restrictions

Find routes that satisfy additional criteria, for instance, must [not] go through certain nodes. More info and discussion here:

Chatroom to get started:

Rust Lightning network node

Another LN node? Why we need it?

The problem with the existing Lightning node implementations is their very limited extensibility for such things as:

  • future LN upgrades (channel factories, pay-to-ec-point, taproot),
  • protocols on top of LN (layer 3), like DLCs on LN or proposed Lightspeed payments, which require modification on the structure of the commitment transaction.

We will try to build a node that is highly modular and is ready for the future LN extensions. More information here:

During the hackathon we will try to:

  • compose core architecture with non-blocking multithreading
  • add lightning network wire protocol
  • implement BOLT-9 (using rust-lightning it should be simple)
  • implement BOLT-1: do connection to other LN nodes + send/receive `connect`, `ping` & `ping` messages
  • (optionally) implement gossip protocol

Contact User:Dr-Orlovsky for details

Chatroom to get started:


This is the new name for the cheapnode project: Building the cheapest possible bitcoin fullnode (+lightning and other services) on old Android phones.

Help wanted on Github issues with label "hacksprint"

Chatroom to get started:

Backup plugin for c-lightning

Backups are a major issue in the Lightning Protocol, given that any sort of dataloss could potentially result in loss of funds. This means that restoring an old backup of the database could result in the node broadcasting an old state, which is a cheat attempt in the protocol, which is punished.

The backup c-lightning plugin ( implements the basic mechanisms to create a synchronous backup of any change to the database, and ensures that the backup stays in sync with the database. It does so in a generic way allowing to write backups to a variety of backends, but initially only implements a file-system based backup backend that is located on the same machine, but on a separate disk. Doing so already provides protection against data corruption on the primary disk. Potential future improvements could include:

  • Backup to Google services. Examples include:
    • GDrive
    • Google Docs - Sheets
    • Google Cloud Storage
  • Backup to Dropbox
  • Send backup data to a peer using the custommsg hook
  • Backups to a dedicated backup server

In the case of a dedicated backup server the plugin could also manage a subscription that is used to pay for the backup service.

User:cdecker is available for additional information and mentorship. See his Wiki page for contact information.

Low Bandwidth Lightning Channels

There is a need to strengthen the Bitcoin ecosystem for people whose only computing device is a low end mobile phone and who live where Internet access is expensive, unreliable, intermittent or censored. willcl-ark created a way to proxy Lightning channels over low-bandwidth communication systems using a c-lightning patch "noencrypt" and python plugin called lnproxy. This plugin is written specifically to use a goTenna radio connected to a computer over USB, but this system can also be adapted for other low-bandwidth channels like SMS (for people who cannot afford mobile internet), LoRa mesh radio or similar systems. jharveyb is working on fldigi-proxy to help adapt LNProxy for ham radio and willcl-ark has created a fork of lnproxy that uses sockets to work with the fldigi-proxy.

You can read more about LNProxy here to get an overview of the project.

The challenge is to adapt LNProxy to a different low-bandwidth communication method. For example, LoRa radio, Bluetooth or an SMS API.

Chatroom to get started:

User:Remyers is available for additional information and mentorship. Contact Richard at @remyers on or @remyers_ on twitter.

Coinswap/DLC with payment points

Using single signer ECDSA adaptors the protocols should work on main net.

Work in progress code: and

Adding your Project

Feel free to add a challenge yourself! The wiki is open to any Bolter (you'll figure out how to edit). If you have a GitHub Repo best practice is to put the label "hackathon" (yellow) next to issues you like people to join/help for the weekend. If you added a challenge please also get in touch on Mattermost for more information and collaboration.