Projects

Projects I created, worked on or contributed to in the last years. This might not be exhaustive. Having the freedom to work on these projects would not have been possible without the funding I received over the last few years.

July 29, 2025

peer-observer: A tool and infrastructure for monitoring the Bitcoin P2P network for attacks and anomalies

Over the past few years, I’ve been working on monitoring tools for the Bitcoin network. One of these projects is peer-observer: A tool and …

November 29, 2023

CPU usage of Bitcoin Core peers

To help improve partition resistance, a medium-term goal is to increase the number block relay connections a Bitcoin Core node has (see #28462). …

October 7, 2023

bitcoin++23 Workshop: Writing a NixOS Module for your_app

Instructions for my Writing a NixOS Module for your_app workshop. Slides can be found here.

August 10, 2023

GitHub Metadata Backup and Mirror

This year, the Bitcoin Core project will have its 13th anniversary being hosted on GitHub. 13 years of issues and pull requests with critical design …

June 8, 2022

bitcoin++ workshop: Tracing Bitcoin Core v23.0

These are the tasks of my “Tracing Bitcoin Core v23.0” workshop for bitcoin++ 2022. They might not make much sense on their own as …

March 2, 2022

Advancing Bitcoin Workshop: Tracing Bitcoin Core v23.0

These are the tasks of my “Tracing Bitcoin Core v23.0” workshop I held at Advancing Bitcoin 2022. They might not make much sense on their …

November 14, 2021

Monitoring Taproot Activation

In November 2021, the Taproot soft-fork activated on the Bitcoin network. I streamed my activation monitoring and helped pools not mining P2TR spends …

July 28, 2021

Contribution: Bitcoin Core Project

I list my contributions to the Bitcoin Core project and detail their context and background. Of course, not all contributions are worth mentioning …

June 28, 2021

Summer of Bitcoin 2021

This is a placeholder for the Summer of Bitcoin mentoring I did. I plan to fill this in, once I get the time to do so.

June 27, 2021

bitcoind-observer

My experimental bitcoind-observer tool is a Bitcoin Core Prometheus metrics exporter utilizing and demonstrating the newly added tracepoints in …

May 6, 2021

miningpool-observer: Observing Bitcoin Mining Pools

My miningpool-observer project aims to bring transparency to mining pool transaction selection. The tool can detect missing and extra transactions in …

January 31, 2020

transactionfee.info (2020 version)

The website transactionfee.info shows Bitcoin protocol layer statistics. This includes statistics about Bitcoin transactions, their in- and outputs, …

November 27, 2019

Contribution: Colab version of the Optech Schnorr / Taproot Workshop

Bitcoin Optech created a workshop explaining the Schnorr and Taproot upgrade to engineers. However, users needed to compile a patched version of …

October 10, 2019

Bitcoin Transaction Monitor

Whenever you, an exchange or somebody else sends a Bitcoin transaction, it gets broadcast to all nodes in the Bitcoin network. Each broadcast …

September 28, 2019

rawtx library

The rawtx Golang module helps you (and me) to answer questions about raw Bitcoin transactions, their inputs, outputs, and scripts. I use the rawtx …

August 4, 2019

Timeline: Historical events in the development of Bitcoin

To fully understand the rationale behind the current state of Bitcoin development, knowledge about historical events is essential. I created an …

June 1, 2019

mempool.observer (2019 version)

The mempool.observer website displays visualizations about my Bitcoin mempool. For example, a visualization of my current mempool and the historical …

May 16, 2019

mempool-dat

A Golang package that can deserialize Bitcoin Core’s mempool.dat files. This is a toy project. I developed this to learn more about Golang and …

March 2, 2019

c-lightning plugin: csvexportpays

A toy plugin for c-lightning to export all payments made with a c-lightning node to a .csv file. I build this a few days after Blockstream released …

June 23, 2018

lnplays.com

Konstantin Nick (@sputn1ck) and I build lnplays.com for the Lighting Hackday in June 2018. You could play Pokémon via the Lightning Network build. …

January 22, 2018

transactionfee.info (2018 version)

We build transactionfee.info in 2018 to raise awareness about the inefficient use of block space by exchanges, services, and wallets. The project is a …

October 7, 2017

mempool.observer (2017 version)

The mempool.observer website displays statistics about my Bitcoin mempool. This covers the 2017 version which I iterated on in 2019.