—— 1 month ago · 5 min read ——

CoinJoin protocol

We all know that Bitcoin transactions are pseudonymous, meaning that even though they don't directly reveal the real-world identities, they still leave a trail that can potentially be traced back to the users. This fragility of privacy poses significant risks, as once compromised, it can be difficult, sometimes very costly, or even impossible to recover. Let's find out more about CoinJoin, a privacy protocol designed to eliminate these privacy concerns.

History of CoinJoin

The concept of CoinJoin originated in the mind of Bitcoin developer Gregory Maxwell. Maxwell's involvement with Bitcoin dates back to its early years, and he has been instrumental in shaping the evolution of the CoinJoin protocol.

The CoinJoin idea was first publicly mentioned in an announcement thread on the bitcointalk.org forum and represents a significant innovation in the area of Bitcoin pseudonymity. CoinJoin is a protocol designed to enhance the privacy of Bitcoin transactions by combining multiple transactions into a single transaction, thereby obfuscating the relationship between inputs and outputs. This coin-joining concept introduces a level of anonymity that is critical to maintaining the privacy and fungibility of Bitcoin.

Maxwell's commitment to Bitcoin privacy extends beyond CoinJoin. He has been a vocal proponent of technologies such as Confidential Transactions and Mimblewimble, which further enhance the privacy and scalability of cryptocurrency transactions. Maxwell's work underscores the importance of privacy in decentralized systems and highlights ongoing efforts to improve the privacy features of Bitcoin.

Crypto mixer and CoinJoin

At its core, coin-joining involves users who wish to mix their Bitcoin transactions, finding counterparts with similar intentions, and together initiating a joint transaction. While the concept sounds simple in theory, its execution is far from straightforward. Recognizing these challenges, developers in the cryptocurrency space began creating tools to automate the CoinJoin process for the average user. Early iterations of CoinJoin tools found their way into popular wallets such as the Wasabi wallet, the Samourai wallet, and most recently, the Trezor hardware wallet. In addition, various crypto mixers, also known as Bitcoin mixers, have integrated CoinJoin functionality into their platforms.

This is where our crypto mixer, Whir, comes in, equipped with the CoinJoin protocol. By integrating CoinJoin directly into our platform, we provide users with a seamless and efficient means to increase the privacy of their Bitcoin transactions. Gone are the days of manual coordination and technical complexity; Whir streamlines the process to a few simple clicks, ensuring that privacy is not just an option but a fundamental feature of every transaction.

Anonymize your Bitcoins with the CoinJoin-powered crypto mixer Whir.

How CoinJoin works

At its core, CoinJoin protocol provides a simple yet powerful solution to enhance the privacy of Bitcoin transactions. Let's explain how it works using this illustrative example:

Combine UTXOs: CoinJoin combines multiple coins, also known as Unspent Transaction Outputs (UTXOs), from different users into a single transaction. Each UTXO represents a portion of the Bitcoin previously received in a transaction but not yet spent.

Output transformation: Despite the combination of multiple UTXOs, the output of the CoinJoin transaction retains the same total value of Bitcoin, minus fees (miner's and mixer's). However, the addresses associated with these outputs are changed. This means that the value of the Bitcoin remains intact, but the trace back to the original addresses is effectively obfuscated.

Privacy Enhancement: The basic concept behind CoinJoin is to reintroduce anonymization into Bitcoin transactions. By breaking the direct link between the inputs (UTXOs) and outputs of a transaction, CoinJoins thwarts attempts by external parties to infer relationships between them.

Understanding UTXOs

Before delving deeper, it's important to understand the concept of unspent transaction outputs (UTXOs). In the Bitcoin blockchain, transactions are made up of inputs and outputs. When someone sends you Bitcoin, they're essentially spending one or more UTXOs that were previously assigned to them in previous transactions. These UTXOs are then reassigned to you as the new owner and become part of your Bitcoin balance.

In Bitcoin, addresses are like digital identifiers that are used to send and receive funds. Each address corresponds to a specific UTXO or UTXOs that represent the Bitcoin balance associated with it. However, by default, the use of Bitcoin addresses and UTXOs can inadvertently reveal information about your transaction history, the amount of Bitcoin you hold in your wallet, or even potentially link your Bitcoin activity to your identity.

So the answer to the question Why do we need Bitcoin mixing? is simple, we all have the right to privacy and in this heavily monitored world, Whir is a superior crypto mixer that will give you back your lost privacy.

Whir's anonymity level

Whir takes privacy a step further by implementing an anonymity level of 5, often referred to as "1-in-5". This means that within a CoinJoin transaction, one UTXO is virtually indistinguishable from four other UTXOs of exactly the same amount. We call this level of anonymity "Anonymous strength", and it is our strongest level. It guarantees absolutely unique and untraceable Bitcoins.

For users who want to mix their coins as quickly as possible, we offer three less stringent levels: Standard strength, Stronger strength, and Extreme strength. Users can easily select the anonymity level just before performing the Bitcoin mixing process.

Final Advice

Before initiating a CoinJoin transaction, it's a good idea to consider local laws and regulations governing cryptocurrency transactions. While CoinJoin is designed to provide individuals with enhanced financial privacy, it's important to acknowledge that there have been instances where it has been exploited for illegal activities such as money laundering. Such suspicions may lead regulators to scrutinize the use of crypto mixers more closely, potentially affecting its perception and legality in certain jurisdictions. Therefore, while embracing CoinJoin for its privacy benefits, it's important to stay within the confines of the law and not abuse crypto mixers for illegal purposes. Our main goal is to provide crypto mixer for everyday users wanting to strengthen their privacy.


CoinJoin emerges as a beacon of hope, offering a powerful solution to protect the privacy of everyday crypto users. By combining multiple UTXOs from different users into a single transaction, CoinJoin effectively obscures the origins of individual transactions. The basic idea behind CoinJoin is simple yet profound: to provide privacy for everyday crypto users, knowing that privacy is not a luxury but a fundamental human right.

Disclaimer: This article does not serve as a piece of financial advice or encouragement and inducement for the usage of Bitcoin and other cryptocurrencies. Its primary role is informative, explanatory, and educational. The readers have to decide themselves whether to use or not to use these types of services.

Further reading

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