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Samourai Wallet Profile picture
@SamouraiWallet
Aug 11, 2021 • 6 tweets • 2 min read • Read on X
Understanding Bitcoin Privacy with OXT

A four part crash course in bitcoin privacy and blockchain analysis. Users armed with this knowledge are better prepared for evaluating the implications of spending and receiving and can begin to take steps to protect their privacy. 👇
Part 1/4
Basic Introduction to Chain Analysis And Transaction Privacy

medium.com/oxt-research/u…
Part 2/4
Chain Analysis Core Concepts

medium.com/oxt-research/u…
Part 3/4
Defenses Against Chain Analysis

medium.com/oxt-research/u…
Part 4/4
Applying Chain Analysis Concepts To Improve User Privacy

medium.com/oxt-research/u…
Discussion with @ErgoBTC and @stephanlivera focused on parts 1-4

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More from @SamouraiWallet

Samourai Wallet Profile picture
Jan 23
In Oct we asked our attorney @Deliver8tor to assemble an expert legal team to respond to FinCEN's proposed rules that would effectively ban bitcoin privacy best practices such as not reusing addresses, and coinjoin.

Last night our letter was submitted

blog.samourai.is/our-response-t…
Image
FinCEN should withdraw entirely the Mixing Transaction NPRM because if adopted, would be the first time FinCEN used its Section 311 powers against a class of transactions, but also the first time FinCEN has ever imposed Special Measure 1. Image
The Mixing Transaction NPRM proposes a rule that is an improper and overbroad application of Section 311 measures to achieve transaction surveillance and suppression that FinCEN does not otherwise have a lawful basis to undertake. Image
Read 10 tweets
Samourai Wallet Profile picture
Dec 7, 2023
We can confirm that @ocean_mining has enacted a policy of censoring Whirlpool coinjoin transactions and BIP47 notification transactions as of Dec 6, 2023

This is a regrettable action by the operators @jack and @LukeDashjr and far surpasses any hostile action we have seen before
Luke is claiming that Whirlpool transactions are "bugged" and create non standard transactions due to a 46 byte OP_RETURN present in Whirlpool Tx0 transactions.

This is a lie. He knows it is a lie. The OP_RETURN limit has been 80 bytes since Bitcoin Core version 0.12 Image
Luke runs a fork of Core called Knots, in his fork he has defined the OP_RETURN limit at 42 bytes. He is more than entitled to do this.

However to claim Whirlpool transactions are non standard because they do not conform to the values of his niche fork is totally wrong and a lie
Read 10 tweets
Samourai Wallet Profile picture
Jun 30, 2022
With all the chatter about the latest statist overeach in the EU regarding bitcoin and 'unhosted wallets' I figured I would share some slides from my talk at @GunsnBitcoin 2022 in Miami

Let's start with Satoshi's white paper titled "Bitcoin: A Peer-to-Peer Electronic Cash System Image
The clue is in the title.

Take note of the following key words:
- Peer-to-Peer
- Electronic Cash.

We'll come back to that, but first to understand what Satoshi invented we need to understand physical (non digital) cash Image
Aristotle explored what makes good money in his Nicomachean Ethics. No doubt many of you have seen this before, usually when someone is trying to convince you to buy gold. But it just so happens that even physical fiat dollars tick these boxes too. Image
Read 22 tweets
Samourai Wallet Profile picture
Mar 17, 2022
We're seeing a large number of coins leaving Wasabi into Whirlpool over the last few days. The market is speaking and loudly repelling censorship and surveillance.

If you're new, especially coming from Wasabi this thread will explain the key differences in Whirlpool
In Whirlpool the coordinator fee is a flat fee and is paid upfront. The flat fee makes it cheaper to coinjoin for users (instead of % of amt you mix) and makes it more costly for an attacker to disrupt the registration phase. We call this setup transaction the "Tx0"
In Whirlpool no address reuse or coins that have been 'seen' together in previous transactions are allowed into the mix transaction. Unlike Wasabi where up to seven outputs are controlled by one user, Whirlpool mixes only allow one output per user per mix transaction.
Read 8 tweets
Samourai Wallet Profile picture
Mar 14, 2022
CoinJoin coordinators are simply message passers. This is true of Wasabi & Whirlpool. They are not money transmitters, they are not facilitators they simply pass data packets to connected clients. Clients never surrender custody to any 3rd party. Clients collaborate w/ each other
Your ISP is not responsible for the websites you visit, even though they serve you the data packets that made your visit possible.

Your VPN is not responsible for copyright infringement when you illegally download a torrent.
The ability to share data freely be it books, art, media, thoughts and ideas, or UTXO state is essential for free society and is fundamentally human.

The radical encroachment of the state into the lives of ordinary law abiding citizens is on an a concerning upward trajectory.
Read 8 tweets
Samourai Wallet Profile picture
Feb 19, 2022
We're proud to release the Bitcoin Privacy Series on youtube today. The first 7 videos are all under 7 minutes long and will get you up to speed on the challenging concept that is bitcoin privacy.

Check out the playlist & like and sub for more videos

The first video introduces the concept of Unspent Transaction Outputs (UTXOs). This is a fundamental step in understanding bitcoin transaction privacy. In 2 minutes you will gain an understanding of UTXOs

The second video explains the change output. For a lot of bitcoin users the concept of a change output is either completely unknown or misunderstood. In 2 minutes you will understand change outputs and how bitcoin transactions are structured

Read 11 tweets

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