<p>It is true that you can successfully hide your IP address and the origin of transactions using Tor; however, it is possible using the blockchain, the public ledger of Bitcoin to follow Bitcoin all the way back through transactions to where they were instanced being mined. This means that it is possible for someone to identify certain aspects of the movement of your Bitcoin, the equivalent of having someone watching where you draw your pay and go and spend it. Wallet linking is also still possible, and with one piece of information from  where you have purchased goods or your Bitcoin exchange then a lot of information is available.</p>
<p><a href="http://beautifuldata.net/wp-content/uploads/2015/01/btc_network-1024x731.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/1MJkx.png" alt="using igraph to calculate and draw the resulting network of transactions between addresses" /></a>
Above: <strong>Map of transactions for an address without using Bitcoin Mixer</strong><br />
<em>Note: All of the origination and destination nodes are the real interaction of the balance transfer from the wallet address.</em></p>
<p>We summarize from the graph that a Bitcoin user received many Bitcoin from mining, transferred those to new addresses possibly believing they were being hidden or possibly handing forward, then used all inputs for a transfer of balance at the red node completely deanonymising the relationships between them. And then, the balances and change are further described where you can see everything is linked to one transaction. If identified the customer and wallet are identified also making a reasonable subject for targeted attacks in an attempt to steal.</p>
<p>If we do not use a Bitcoin Mixer then more targeted attacks on the Bitcoin in our Wallet are possible through transaction tracing and the chances of them being stolen by more targeted attacks are higher.</p>
<p>A Bitcoin Mixer takes your Bitcoin and returns other Bitcoin in a non-linear fashion, breaking the linkage. This is useful. None in free countries should be concerned if governments know the movement of your Bitcoin, and it must be realised that there are researchers and people otherwise who also follow with interest. None would have them follow us around to watch how we spend our own money that we have earned.</p>
<p>Many Bitcoin Mixers may be found with [Great Big Internet Search Engine], however many may wonder if any are trustworthy. The following list is not exhaustive and I neglect to try them all, however I have tried using the Jambler.io partner program and found that it worked correctly when it was trialled: <a href="http://www.go-overt.com" rel="nofollow noreferrer">http://www.go-overt.com</a> as you can <a href="https://www.go-overt.com/?result&amp;address=32bQNxRyHEzsaa4pQMtbfHBDNC5GLqoiHq&amp;guarantee_text=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" rel="nofollow noreferrer">verify for yourself</a>.</p>
<p>You should still require to <a href="https://bitcoin.stackexchange.com/questions/70069/how-can-i-setup-bitcoin-to-be-anonymous-with-tor">hide your IP address for privacy</a> as discussed in answer to a separate question.</p>
<p>rel:<br />
<a href="https://datalion.com/visualizing-blockchain-7-beautiful-informative-bitcoin-visualizations/" rel="nofollow noreferrer">https://datalion.com/visualizing-blockchain-7-beautiful-informative-bitcoin-visualizations/</a><br />
<a href="http://beautifuldata.net/2015/01/querying-the-bitcoin-blockchain-with-r/" rel="nofollow noreferrer">http://beautifuldata.net/2015/01/querying-the-bitcoin-blockchain-with-r/</a><br />
<a href="https://decryptmedia.com/6052/blockchain-analytics-companies-bitcoin" rel="nofollow noreferrer">https://decryptmedia.com/6052/blockchain-analytics-companies-bitcoin</a><br />
<a href="https://envisionourfuture.tumblr.com/post/184433625869/future-money-requires-privacy" rel="nofollow noreferrer">https://envisionourfuture.tumblr.com/post/184433625869/future-money-requires-privacy</a></p>

CC BY-SA 4.0
2019-05-13T21:08:51.740Z
Note: the mixing service recommended here requires you to 100% trust the service to not steal your coins, or save logs about your transaction/info. Their service fee is also really high. There are other wallets that provide mixing services without requiring your trust, and they have much lower fees.
chytrik
CC BY-SA 4.0
2019-05-14T01:21:47.003Z
Non-custodial wallets with integrated mixing service? I was not aware, care to name a few?
Willtech
CC BY-SA 4.0
2019-05-14T01:27:27.833Z
I generally avoid naming services on here, so this is not an endorsement, but wasabi wallet and joinmarket are two such examples.
chytrik
CC BY-SA 4.0
2019-08-08T18:46:33.047Z
@chytrik I intended to investigate wasabi wallet in more detail than I have but imagine the same level of trust is required. A piece of software must somehow negotiate to mix coins, and then do so using a syncronised transfer between two parties? Or some method of trade integrated with an exchange? Even centralized coin mixing could steal your transaction if it can re-sign. I like the idea of a wallet with mixing, and like the idea of conjoining but cannot see how such a wallet can operate securely. All of the methods that I am aware of require trust.
Willtech
CC BY-SA 4.0
2019-08-08T23:15:37.887Z
Wasabi does not require trust in the same way; their coinjoin coordinating server never has control of coins, nor does it know anything about it's users. This is accomplished through blinded signing of inputs, and all communications are run over tor, with new tor circuits created for pretty much very action taken by the user. As a user, you don't need to worry that your coins will be stolen by the mixer (they literally cannot be), and you don't need to worry about the coordinating server logging any info about you. It is a vastly different setup than the older bitcoin tumblers, etc
chytrik
CC BY-SA 4.0
2019-08-08T23:17:19.663Z
you should definitely look into it further if you're interested, its a very cool privacy tool. Still has its limitations, but very powerful when used correctly.
chytrik
CC BY-SA 4.0
2019-05-13T15:22:02.193Z
2021-05-04T17:07:28.223Z
2021-05-04T17:07:28.223Z
Willtech
<p>Using a mixer helps preserve your financial privacy. The question is: who are you protecting your privacy from?</p>

<p>Bitcoin transactions are public record, so anybody can view any historical transaction at their leisure. So when considering your privacy, there are a few different situations worth exploring, for example:</p>

<p><strong>An unrelated third party is looking at your transactions</strong></p>

<p>The blockchain history is public record, so anyone can view the entire history. Addresses aren't linked to real-world identities, but by looking at spending patterns, a third party can make guesses at which addresses are controlled by the same wallets (and thus users). Keep in mind this is only a <em>guess</em>, made by using certain heuristics that are not always correct, but nonetheless in many cases these guesses can still be accurate. </p>

<p><strong>A counterparty to your transactions is looking</strong></p>

<p>This is perhaps where a Bitcoin mixer becomes most useful. While addresses are pseudonymous, when you transact with someone they will gain some information about which addresses you control. </p>

<p>For example, if you have a 5 BTC UTXO, and spend it to send 1 BTC to somebody, then by looking at the transaction, your counterparty would know that you own at least 4 BTC more. And by analyzing the history of inputs (and outputs) from your transaction with them, the third party may be able to guess which other addresses you own, by using the same sort of heuristics mentioned above. So suddenly, just by transacting with someone, you've sacrificed a perhaps unnecessary amount of your financial privacy and history to them. </p>

<p>This is where a mixer can help: it breaks the links between addresses in your wallet, by allowing you to participate in transactions which break blockchain analysis techniques. As in the example above, your counterparty would still be able to see your change output, but they would be unable to look at the history of inputs (and outputs) from the transaction to gain more information about your wallet (though they would be able to tell you used a mixer). </p>

<p><strong>An analytics company with a lot of resources is looking</strong></p>

<p>This situation has the same considerations as above, but it is worth noting that analytics companies may have enough resources to engage in deeper investigations and analysis, for example by using IP address tracking to associate addresses to users. Nonetheless, using a mixing service will still help preserve your financial privacy.</p>

<p>As an example, many KYC'd exchange services are required by law to keep track of how their users interact with the service, and spend the bitcoin they acquire through it. This means the service might watch how you spend bitcoins that they sell to you, in order to ensure you aren't engaging in some illicit activities (according to the legislation the exchange must follow). So by using a mixer, you can sever the link between your exchange account, and your bitcoin spending habits. </p>

<hr>

<p>Note that throughout all of this, the main idea is that <strong>you should only reveal your financial history to those individuals you choose to</strong>, meaning, this gives you the selective ability to preserve your privacy. If you need to provide a history of transactions for an audit, then you can do so, and a bitcoin mixer will not help you fake that history. </p>

<p>This makes a bitcoin mixer more useful for the everyday user that wants to uphold their privacy, than it is for a criminal wishing to hide their history from authorities. Maintaining privacy is difficult, but possible, and in fact many Bitcoin developers are working on technologies that will make the tracking of transactions more difficult. Maintaining privacy and fungibility is important: without it Bitcoin as a system of money and value would be broken. </p>

<hr>

<p>EDIT: It is also worth mentioning that not all mixers are alike. In fact, many mixers have historically been unable to actually break the links between users/wallets/addresses, so they provide a false sense of security. </p>

<p>Consider this: if you were running a chain analysis company, and the existence of a mixer would hurt your business model, then <em>why not just run a mixer yourself, and keep logs of all the transactions that users send through it?</em> You would have front-row access to all their transactions, under the guise of providing them privacy. </p>

<p>With this in mind, A good mixer should be:</p>

<ul>
<li>Non-custodial</li>
<li>Unable to distinguish between users/inputs/outputs, and thus unable to keep a history of users/transactions </li>
<li>It should probably run exclusively over the Tor network</li>
</ul>

<p>If a mixer doesn't satisfy these points, it should be avoided.</p>

CC BY-SA 4.0
2019-05-13T22:09:11.253Z
2019-05-14T16:11:00.360Z
2019-05-14T16:11:00.360Z
chytrik
<p>A good <a href="https://hostanat.medium.com/best-bitcoin-mixers-in-2021-3270161ca9f6" rel="nofollow noreferrer">overview</a> of why and what mixers are better to use</p>

CC BY-SA 4.0
2021-05-01T09:08:02.500Z
2021-05-01T09:08:02.500Z
igor4btc
<p>BTC transactions are publicly visible even if you use TOR. Analytical methods allow clustering BTC addresses belonging with a high likelihood to the same owner, e.g. by monitoring co-spend addresses or identifying change addresses. With a mixer you can break this traceability. However, there are obstacles you need to have in mind:</p>
<ol>
<li>The mixing service operator can run away with your coins (unless it's a de-central open source tool)</li>
<li>The mixing operator knows your old and new addresses and could reveal it (unless the tool is designed that nobody can see it)</li>
<li>If you ever bring the new coins together with old ones in the same wallet then the mixing was useless (a peer of mine recently analyzed a wasabi transaction and could link 21% of the output addresses to their inputs).</li>
<li>If you use central services like exchanges then mixing is useless, at least if you are registered and use the service with both the old and new wallet.</li>
<li>If you don't connect your wallet to your own node you need to trust the node operator who can spy out your wallet addresses which reveals your privacy.</li>
</ol>

CC BY-SA 4.0
2020-11-20T18:24:45.093Z
2020-11-20T18:24:45.093Z
tempo
<p>I understand that I can use Bitcoin anonymously using <a href="https://bitcoin.stackexchange.com/questions/70069/how-can-i-setup-bitcoin-to-be-anonymous-with-tor">Bitcoin Core with Tor</a> running a full node or with <a href="https://bitcoin.stackexchange.com/questions/74499/how-can-i-use-bitcoin-privately-with-the-electrum-wallet-and-tor">Electrum using Tor</a> running an SPV node, why should I also use a Bitcoin Mixer?</p>

<privacy><tor><traceability><taint-analysis><mixing>
Why should I use a Bitcoin Mixer?
Willtech
# Why should I use a Bitcoin Mixer?

(Asked by: username_0 on 2019-05-13)

I understand that I can use Bitcoin anonymously using [Bitcoin Core with Tor](https://bitcoin.stackexchange.com/questions/70069/how-can-i-setup-bitcoin-to-be-anonymous-with-tor) running a full node or with [Electrum using Tor](https://bitcoin.stackexchange.com/questions/74499/how-can-i-use-bitcoin-privately-with-the-electrum-wallet-and-tor) running an SPV node, why should I also use a Bitcoin Mixer?

**Tags:** privacy, tor, traceability, taint-analysis, mixing


---

## 4 answers

### Answer by username_0 on 2019-05-13. Score: 0 | Accepted answer

It is true that you can successfully hide your IP address and the origin of transactions using Tor; however, it is possible using the blockchain, the public ledger of Bitcoin to follow Bitcoin all the way back through transactions to where they were instanced being mined. This means that it is possible for someone to identify certain aspects of the movement of your Bitcoin, the equivalent of having someone watching where you draw your pay and go and spend it. Wallet linking is also still possible, and with one piece of information from where you have purchased goods or your Bitcoin exchange then a lot of information is available.

[![using igraph to calculate and draw the resulting network of transactions between addresses](https://i.sstatic.net/1MJkx.png)](http://beautifuldata.net/wp-content/uploads/2015/01/btc_network-1024x731.png)
Above: **Map of transactions for an address without using Bitcoin Mixer**  
*Note: All of the origination and destination nodes are the real interaction of the balance transfer from the wallet address.*

We summarize from the graph that a Bitcoin user received many Bitcoin from mining, transferred those to new addresses possibly believing they were being hidden or possibly handing forward, then used all inputs for a transfer of balance at the red node completely deanonymising the relationships between them. And then, the balances and change are further described where you can see everything is linked to one transaction. If identified the customer and wallet are identified also making a reasonable subject for targeted attacks in an attempt to steal.

If we do not use a Bitcoin Mixer then more targeted attacks on the Bitcoin in our Wallet are possible through transaction tracing and the chances of them being stolen by more targeted attacks are higher.

A Bitcoin Mixer takes your Bitcoin and returns other Bitcoin in a non-linear fashion, breaking the linkage. This is useful. None in free countries should be concerned if governments know the movement of your Bitcoin, and it must be realised that there are researchers and people otherwise who also follow with interest. None would have them follow us around to watch how we spend our own money that we have earned.

Many Bitcoin Mixers may be found with [Great Big Internet Search Engine], however many may wonder if any are trustworthy. The following list is not exhaustive and I neglect to try them all, however I have tried using the Jambler.io partner program and found that it worked correctly when it was trialled: <http://www.go-overt.com> as you can [verify for yourself](https://www.go-overt.com/?result&address=32bQNxRyHEzsaa4pQMtbfHBDNC5GLqoiHq&guarantee_text=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).

You should still require to [hide your IP address for privacy](https://bitcoin.stackexchange.com/questions/70069/how-can-i-setup-bitcoin-to-be-anonymous-with-tor) as discussed in answer to a separate question.

rel:  
<https://datalion.com/visualizing-blockchain-7-beautiful-informative-bitcoin-visualizations/>  
<http://beautifuldata.net/2015/01/querying-the-bitcoin-blockchain-with-r/>  
<https://decryptmedia.com/6052/blockchain-analytics-companies-bitcoin>  
<https://envisionourfuture.tumblr.com/post/184433625869/future-money-requires-privacy>

> **Comments:**
> **username_1**: Note: the mixing service recommended here requires you to 100% trust the service to not steal your coins, or save logs about your transaction/info. Their service fee is also really high. There are other wallets that provide mixing services without requiring your trust, and they have much lower fees.  
> **username_0**: Non-custodial wallets with integrated mixing service? I was not aware, care to name a few?  
> **username_1**: I generally avoid naming services on here, so this is not an endorsement, but wasabi wallet and joinmarket are two such examples.  
> **username_0**: @username_1 I intended to investigate wasabi wallet in more detail than I have but imagine the same level of trust is required. A piece of software must somehow negotiate to mix coins, and then do so using a syncronised transfer between two parties? Or some method of trade integrated with an exchange? Even centralized coin mixing could steal your transaction if it can re-sign. I like the idea of a wallet with mixing, and like the idea of conjoining but cannot see how such a wallet can operate securely. All of the methods that I am aware of require trust.  
> **username_1**: Wasabi does not require trust in the same way; their coinjoin coordinating server never has control of coins, nor does it know anything about it's users. This is accomplished through blinded signing of inputs, and all communications are run over tor, with new tor circuits created for pretty much very action taken by the user. As a user, you don't need to worry that your coins will be stolen by the mixer (they literally cannot be), and you don't need to worry about the coordinating server logging any info about you. It is a vastly different setup than the older bitcoin tumblers, etc  
> **username_1**: you should definitely look into it further if you're interested, its a very cool privacy tool. Still has its limitations, but very powerful when used correctly.  

---

### Answer by username_1 on 2019-05-13. Score: 4

Using a mixer helps preserve your financial privacy. The question is: who are you protecting your privacy from?

Bitcoin transactions are public record, so anybody can view any historical transaction at their leisure. So when considering your privacy, there are a few different situations worth exploring, for example:

**An unrelated third party is looking at your transactions**

The blockchain history is public record, so anyone can view the entire history. Addresses aren't linked to real-world identities, but by looking at spending patterns, a third party can make guesses at which addresses are controlled by the same wallets (and thus users). Keep in mind this is only a *guess*, made by using certain heuristics that are not always correct, but nonetheless in many cases these guesses can still be accurate.

**A counterparty to your transactions is looking**

This is perhaps where a Bitcoin mixer becomes most useful. While addresses are pseudonymous, when you transact with someone they will gain some information about which addresses you control.

For example, if you have a 5 BTC UTXO, and spend it to send 1 BTC to somebody, then by looking at the transaction, your counterparty would know that you own at least 4 BTC more. And by analyzing the history of inputs (and outputs) from your transaction with them, the third party may be able to guess which other addresses you own, by using the same sort of heuristics mentioned above. So suddenly, just by transacting with someone, you've sacrificed a perhaps unnecessary amount of your financial privacy and history to them.

This is where a mixer can help: it breaks the links between addresses in your wallet, by allowing you to participate in transactions which break blockchain analysis techniques. As in the example above, your counterparty would still be able to see your change output, but they would be unable to look at the history of inputs (and outputs) from the transaction to gain more information about your wallet (though they would be able to tell you used a mixer).

**An analytics company with a lot of resources is looking**

This situation has the same considerations as above, but it is worth noting that analytics companies may have enough resources to engage in deeper investigations and analysis, for example by using IP address tracking to associate addresses to users. Nonetheless, using a mixing service will still help preserve your financial privacy.

As an example, many KYC'd exchange services are required by law to keep track of how their users interact with the service, and spend the bitcoin they acquire through it. This means the service might watch how you spend bitcoins that they sell to you, in order to ensure you aren't engaging in some illicit activities (according to the legislation the exchange must follow). So by using a mixer, you can sever the link between your exchange account, and your bitcoin spending habits.

---

Note that throughout all of this, the main idea is that **you should only reveal your financial history to those individuals you choose to**, meaning, this gives you the selective ability to preserve your privacy. If you need to provide a history of transactions for an audit, then you can do so, and a bitcoin mixer will not help you fake that history.

This makes a bitcoin mixer more useful for the everyday user that wants to uphold their privacy, than it is for a criminal wishing to hide their history from authorities. Maintaining privacy is difficult, but possible, and in fact many Bitcoin developers are working on technologies that will make the tracking of transactions more difficult. Maintaining privacy and fungibility is important: without it Bitcoin as a system of money and value would be broken.

---

EDIT: It is also worth mentioning that not all mixers are alike. In fact, many mixers have historically been unable to actually break the links between users/wallets/addresses, so they provide a false sense of security.

Consider this: if you were running a chain analysis company, and the existence of a mixer would hurt your business model, then *why not just run a mixer yourself, and keep logs of all the transactions that users send through it?* You would have front-row access to all their transactions, under the guise of providing them privacy.

With this in mind, A good mixer should be:

* Non-custodial
* Unable to distinguish between users/inputs/outputs, and thus unable to keep a history of users/transactions
* It should probably run exclusively over the Tor network

If a mixer doesn't satisfy these points, it should be avoided.


---

### Answer by username_2 on 2021-05-01. Score: 0

A good [overview](https://hostanat.medium.com/best-bitcoin-mixers-in-2021-3270161ca9f6) of why and what mixers are better to use


---

### Answer by username_3 on 2020-11-20. Score: 0

BTC transactions are publicly visible even if you use TOR. Analytical methods allow clustering BTC addresses belonging with a high likelihood to the same owner, e.g. by monitoring co-spend addresses or identifying change addresses. With a mixer you can break this traceability. However, there are obstacles you need to have in mind:

1. The mixing service operator can run away with your coins (unless it's a de-central open source tool)
2. The mixing operator knows your old and new addresses and could reveal it (unless the tool is designed that nobody can see it)
3. If you ever bring the new coins together with old ones in the same wallet then the mixing was useless (a peer of mine recently analyzed a wasabi transaction and could link 21% of the output addresses to their inputs).
4. If you use central services like exchanges then mixing is useless, at least if you are registered and use the service with both the old and new wallet.
5. If you don't connect your wallet to your own node you need to trust the node operator who can spy out your wallet addresses which reveals your privacy.


---

