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Author Topic: ♻️ CRYPTOMIXER.IO — FAST, SECURE and RELIABLE BITCOIN MIXER (Since 2016) ⭐⭐⭐⭐⭐  (Read 43050 times)
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March 26, 2018, 05:33:49 AM
 #281

Do you use single key for all your outgoing addresses permanently? How did he found them all? I find all this case disturbing.

No we do not use single key. It seems to be some random list of addresses. We still haven't got any confirmation on this list as we do not have the ability to check it and the author hasn't contacted us. As you seems to be the real cryptomixer customer who follow the tread, kindly contact me directly with you real account (not this alt) to confirm some details. This will help us to to dig into this issue.
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March 31, 2018, 08:47:27 AM
 #282

This is not my alt account. I have registered specially for this case. I may suggest better way of confirmation. I keeped your signed letters of guarantee. I will PM one of it to you shortly so you can ascertain everything yourself.
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April 02, 2018, 07:02:35 AM
Merited by CryptoMixer.io (1)
 #283

I registered this account to share my findings.

Once a lot people mention some weak points of your service I tried to code a little.

I wrote a simple js script sending random cryptomixer codes to server. The server responds with a discount for each code. Running script for about two hours I succeeded to found the code with 0.1% discount: 34ntw. Anyone can check it, though they likely delete the code soon after posting.

My message to cryptomixer: please guys, improve your server responses. You can restrict the rate per IP, for example. Turns out that 5 letters code does not give you good level of security.

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April 02, 2018, 11:21:45 AM
 #284

This is not my alt account. I have registered specially for this case. I may suggest better way of confirmation. I keeped your signed letters of guarantee. I will PM one of it to you shortly so you can ascertain everything yourself.

Thank you for cooperation. I confirm that I have got your PM message. We will carefully check everything.
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April 02, 2018, 11:27:13 AM
Last edit: April 02, 2018, 11:41:05 AM by CryptoMixer.io
 #285

RELEASE ANNOUNCEMENT

Sounds great, especially the SegWit support, but could you already estimate when this update will roll out (days, weeks, months)?
We expect to deliver this update before Apr, 3.

Website has been updated!

This update enables more precise & variable delays, variable network fees and better output distribution. The support of SegWit-addresses that was announced is shifted to the end of month.

Credits: This update include 'PrivacyImportant' and 'Feqlizer' proposals, listed below:

Add a small randomly chosen amount to your transaction fee.
Offer the functionality of choosing the delay on minute basis OR add a randomly chosen delay (for example +- 10 minutes from the chosen hourly delay) to your transaction time.
Every repayment delay should be modified with absolutely random "time noise" which would be hard to quantize.

Thank you all for the cooperation! Feel free to mix your coins.
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April 02, 2018, 12:09:49 PM
 #286

I registered this account to share my findings.

Once a lot people mention some weak points of your service I tried to code a little.

I wrote a simple js script sending random cryptomixer codes to server. The server responds with a discount for each code. Running script for about two hours I succeeded to found the code with 0.1% discount: 34ntw. Anyone can check it, though they likely delete the code soon after posting.

My message to cryptomixer: please guys, improve your server responses. You can restrict the rate per IP, for example. Turns out that 5 letters code does not give you good level of security.

Good job, motherhacker! No, we are not intend to delete the code) Everybody can use it to get a discount. To make it clear, we are giving discounts to stimulate the usage of cryptomixer codes. The first time customer interacts with our system, it is given a code. This code is then used to ensure that this customer's coins are not mixed with any of the previous coins sent by him to our reserves during future transactions. In a simple words, to prevent the scripts to give you, your coins back. Though it is not a security breach, because it doesn't compromise any sensitive data - it only let somebody get a discount, you made a great research and I would like to thank you! Your proposal sounds reasonable and we will include it in one of upcoming updates.
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April 02, 2018, 06:05:45 PM
 #287

Thanks for implementing all mentioned changes. I have another suggestion to futher improve the privacy offered by your service. If you use 10 change addresses there aren't that many possibilities to split the distribution percentages. Please make them more precise. Instead of full percentages (1%,2%,3%,...) it is much better to have 1.5%, 1.8%, 2.5%,...
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April 03, 2018, 05:51:39 AM
 #288

Credits: This update include 'PrivacyImportant' and 'Feqlizer' proposals, listed below
Thanks a lot! It is very nice to see such fast response.

Instead of full percentages (1%,2%,3%,...) it is much better to have 1.5%, 1.8%, 2.5%,...
Seems to be very good proposal! And also modify it with little random noise.

I would like to attract your attention to another little security breach. Setting variable fee of your service feature obviously makes tracing of mixed coins more difficult. But value of your fee is still partially predictable because its displacement amplitude depends on slider width. This trait reduces randomness of your fee severely.

For instance, I found these constant fee values for half a minute:
0.5000%, 0.5019%, 0.5038%, 0.5056%, 0.5067%, ... so on.

If you add random fee noise for each mixing session it will notably increase tracing difficulty.
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April 03, 2018, 06:42:40 PM
 #289

I transferred some money and I see such a page. What to do next? How to make a withdrawal of money? Help!

https://a.radikal.ru/a16/1804/8f/40b58aac4c0c.jpg

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April 04, 2018, 07:30:47 AM
 #290

I transferred some money and I see such a page. What to do next? How to make a withdrawal of money? Help!

On the first step you was entering one or more target addresses and set up delays, if you see this page it means that your coins are received and new coins will be sent to your target address(es) immediately or according to your delays and coin distribution settings. No need to do anything to withdraw money.
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April 04, 2018, 12:01:11 PM
 #291

Good job, motherhacker! No, we are not intend to delete the code) Everybody can use it to get a discount. To make it clear, we are giving discounts to stimulate the usage of cryptomixer codes. The first time customer interacts with our system, it is given a code. This code is then used to ensure that this customer's coins are not mixed with any of the previous coins sent by him to our reserves during future transactions. In a simple words, to prevent the scripts to give you, your coins back.

Yes, of course I understand the concept behind this code. Why dont you just lower your minimum service commission then? Now anybody can read the thread and get a discount.

Though it is not a security breach, because it doesn't compromise any sensitive data - it only let somebody get a discount, you made a great research and I would like to thank you! Your proposal sounds reasonable and we will include it in one of upcoming updates.

Glad to help your service.

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April 12, 2018, 11:52:15 PM
 #292

Can you please comment on this?

https://bitcointalk.org/index.php?topic=3140140.msg34021863#msg34021863
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April 13, 2018, 04:52:21 PM
 #293

There is really work to be done to make this service competitive again. Sadly the owner doesn't have big interested on this. That's a clear sign of desinterest on anonymity and their service promises. I am leaving here and switch to a service who at least tries to keep its promises on anonymity.
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April 14, 2018, 06:31:47 AM
 #294


We are happy to see the independent researchers who also takes care of privacy. We do respect their efforts and wish to see more such experts here.

All the best practices mentioned there are already supported by CryptoMixer or were implemented recently. And few more are under development.

What we do not respect is making FUD and promoting on this. We got used to do our jobs quietly.
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April 15, 2018, 10:39:23 AM
 #295

We got used to do our jobs quietly.
Do you see your job in being told by third parties about your security vulnerabilities and then "quietly" working for weeks or even months until those vulnerabilities get fixed? Great job you are doing there...
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April 16, 2018, 09:11:06 PM
 #296

Do you see your job in being told by third parties about your security vulnerabilities and then "quietly" working for weeks or even months until those vulnerabilities get fixed? Great job you are doing there...

No, we are not really happy that delivery of release with improvements took us so much time. Unfortunately, Cryptomixer is not a startup and it has it's own development cycle. We do make every effort to carefully check all the incoming issues and react properly keeping all development stages in place. While making improvements, we cannot afford to make even more harm. Currently, we are working on features that will shorten the release cycle without endanger the stability. Also, we are intend to launch the special hacker bounty campaign to stress-test the Cryptomixer security level. It will be announced in upcoming weeks as a separate thread, and ill post the link here.

Thank you for cooperation and for highlighting our shortcomings. We are eager to meet your expectations!
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April 21, 2018, 09:40:41 PM
Last edit: April 27, 2018, 09:08:13 PM by CryptoMixer.io
 #297

RELEASE ANNOUNCEMENT

Website has been updated!

This update enables:
- more precise & variable delays, output distribution and the service fee to prevent blockchain analysis;
- the website doesn't import any external scripts (i.e. support chat widget) until it is explicitly requested.

Credits

This update includes proposals listed below:

Thanks for implementing all mentioned changes. I have another suggestion to futher improve the privacy offered by your service. If you use 10 change addresses there aren't that many possibilities to split the distribution percentages. Please make them more precise. Instead of full percentages (1%,2%,3%,...) it is much better to have 1.5%, 1.8%, 2.5%,...

If you add random fee noise for each mixing session it will notably increase tracing difficulty.
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April 27, 2018, 09:08:55 PM
 #298

RELEASE ANNOUNCEMENT

The support of SegWit-addresses that was announced is shifted to the end of month.

The support of SegWit-addresses has been successfully implemented and tested! Nevertheless the release is postponed till the SegWit adoption level will hit 50%. Currently it is about 30-35% and the SegWit support will narrow the range of blockchain analisis to this level, instead of the rest 65-70% of the Network. As soon as adoption level exceed the 50% level, we will switch to SegWit.
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May 17, 2018, 09:31:55 PM
 #299

Also, we are intend to launch the special hacker bounty campaign to stress-test the Cryptomixer security level.

For those who are interested see the thread https://bitcointalk.org/index.php?topic=3920860.msg37612196#msg37612196
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July 30, 2018, 11:52:01 AM
 #300

Also, we are intend to launch the special hacker bounty campaign to stress-test the Cryptomixer security level.

For those who are interested see the thread https://bitcointalk.org/index.php?topic=3920860.msg37612196#msg37612196

Over 20 confirmations and my payment does not arrive, status "awating bitcoin" Huh

I've send a support message and nothing!

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