How to build Bitcoin for Android

22 Jan 2022

The easiest way how to build Bitcoin for Android is to use Docker.

Image slideshow on Raspberry Pi

10 Apr 2020

This is a complement of Autoplay video on Raspberry Pi post.

Strange Attractions

08 Feb 2020

Last week Lenka Hamosova and I were invited to Barcelona, more particularly to a zine fair focused on technology and artificial intelligence called CtrlZ.AI. Thank you Emily and Alex for inviting us!

36c3 Highlights

02 Jan 2020

These are my highlights from 36c3 (36th Chaos Communication Congress):

CoinMetrics

11 Apr 2019

After reading the great article by @jpthor__ called Bitcoin’s True Market Dominance I realised I need to create a tool where I can follow relevance of various coins.

Bitcoin + Lightning Wallets Comparison

05 Jan 2019

This post compares six Bitcoin + Lightning Wallets for Android and iOS.

Trezor Emulator on Raspberry Pi

07 Nov 2018

I got an idea while looking at the cool project called RaspiBlitz. They are using a nice LCD shield on top of Raspberry Pi for their Lightning Node. What if I tried running the Trezor Emulator on the same hardware setup? Trezor is completely open-source, so this should not be a big problem, right? Here is the result of my late-night experiment. And it’s beautiful!

How to send Bitcoin transactions via SMS

15 Aug 2017

Blockstream announced today their Satellite project. This is exactly what I’ve been thinking about for a long time, since the DVB-T broadcasting experiment in 2014. Needless to say, I’m very excited about this development. One of the recurring questions I saw was this: What about the opposite direction (from user to Bitcoin node)?

How to send Bitcoin transactions via SMS

15 Aug 2017

Blockstream announced today their Satellite project. This is exactly what I’ve been thinking about for a long time, since the DVB-T broadcasting experiment in 2014. Needless to say, I’m very excited about this development. One of the recurring questions I saw was this: What about the opposite direction (from user to Bitcoin node)?

Longest TXID prefix collision in Bitcoin

03 Mar 2017

As you probably know, transactions in Bitcoin are identified by their SHA256 hashes which are 256 bits long. These identifiers are called transaction ID or TXID. We were brainstorming a new project at SatoshiLabs and an interesting question popped up. How much can we trim TXIDs before collisions start to appear? Or in another words: can we use just the first 128 bits of the hash instead of the full hash to uniquely identify the transaction? Can we use even less bits?