We’re happy to announce the release of Samourai Wallet 0.99.98f. You can download the APK from our website or on Google Play. You can find release notes on our documentation site. This is a big update with dramatic UI changes, new functionality, the release of a brand new feature, and…

Intro A financial flow (transaction graph) analysis aims to track a single entity’s spending over multiple transactions. By naively mapping the flow relationship of bitcoins, analysts can miss obvious signs of coins changing hands. Additional information known as wallet or software “fingerprinting” can be used to help determine when bitcoins are…

The UK’s National Crime Agency (NCA) has issued a warning that “crypto mixers” are being used for money laundering. In the reporting by the Financial Times, Samourai Wallet and Wasabi Wallet have both been mentioned as a “well-known mixer”. …

When we started building Samourai Wallet in 2015 one of our first priorities was to enable the software to work through the Tor network for increased user privacy and protection. …

Applying Chain Analysis Concepts To Improve User Privacy — Introduction So far this guide has introduced the basics concepts used by chain analysis and the concepts used to undermine chain analysis. It is unlikely that users reading this are looking to become “experts” in chain analysis, but a fundamental understanding of the tools and concepts used to attack their privacy…

Defences Against Chain Analysis — Introduction With the foundational concepts of chain analysis introduced in Part 1 and Part 2, Part 3 will discuss the methods for undermining chain analysis. In this section we will present the following: defeating heuristics for change detection in simple spends creating an ambiguous transaction graph with equal output coinjoins undermining…

Chain Analysis Core Concepts — Introduction Now that we have presented the basic concepts in Part 1, we can move on to the core concepts that underpin chain analysis by expanding our analyses to include “external” transaction data. Specifically, Part II will focus on two of the most important tools underpinning chain analysis: The transaction graph …

Chain Analysis And Transaction Privacy — Introduction Awareness of Bitcoin’s value proposition for censorship resistant payments took off in 2011 with the launch of Silk Road and the rescue of the otherwise donation starved Wikileaks. Simultaneously a dangerous and inaccurate narrative surrounding bitcoin transaction privacy took off: “anonymous” payments. This perception was never true and largely due…

On June 30 Bitcoin Twitter influencer Giacomo Zucco published a short tweet thread to his followers with very strong implications. In the thread Zucco strongly implies that Samourai Wallet has been compromised (presumably by a State actor) and should be avoided. To back up this assertion Zucco provides for evidence…