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Author Topic: Example mixer transaction  (Read 167 times)
surgura
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November 13, 2018, 06:28:38 PM
Merited by DarkStar_ (1)
 #1

Hello all,

For educational purposes I'm looking a few example tumbler transactions. Sadly I'm having a hard time finding any, so I would very much appreciate a pointer in the right direction. Students will use the transaction hash with some block traverses to experience how hard it can be to unravel a mixer.
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November 14, 2018, 06:58:18 AM
Merited by paxmao (1)
 #2

Hello all,

For educational purposes I'm looking a few example tumbler transactions. Sadly I'm having a hard time finding any, so I would very much appreciate a pointer in the right direction. Students will use the transaction hash with some block traverses to experience how hard it can be to unravel a mixer.

From what I know, a mixer will use for one customer, for one use, one new Bitcoin address where the customer will send the funds to be mixed. At next use/next customer, the address will be different.
So unless somebody will give you the track of his coins, I don't know what you could achieve. And of course, nobody will give you that, because it's defeating the purpose of mixing.

I think that your only chance would be to mix yourself some coins, however, you can wait for more answers, maybe others know better...

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November 14, 2018, 09:00:42 AM
Merited by paxmao (2)
 #3

<…>Students will use the transaction hash with some block traverses to experience how hard it can be to unravel a mixer.
I guess that there are different strategies amongst the mixers to perform their task, but the core aim is to make the TXs non traceable, so I don’t know how you want to be able to perform the backtracking process at all (unless you gain inner information to a mixer’s logs which are private and likely volatile).
Some mixers end up providing you in return (output of the mixing process) with private keys. The withdrawal is therefore not visible on the blockchain, so linking your deposits to the withdraws should not be feasible. That’s the whole point really.

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November 14, 2018, 10:45:49 AM
 #4

You could also look into transactions made with Wasabi Wallet, which is essentially a Bitcoin wallet with a built-in mixer. Recent transaction are posted on their website, have fun unraveling Wink

https://www.wasabiwallet.io/


surgura
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November 16, 2018, 11:12:25 AM
 #5

Thanks for the replies. The goal is not to break the mixer, but the opposite. They will trace some coins and end up at the mixer, at which point they will find out they are stuck. I image someone not posting his own mixer transaction, as that obviously creates traces back him, but maybe someone stumbled upon someone else's?  I'm having a look if wasabi has some examples.
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November 16, 2018, 01:46:48 PM
Merited by mocacinno (1)
 #6

Why don't you simply use a mixer yourself for a few transaction?

That's probably the best way to have full control over the whole process.

Different mixers use different techniques to tumble the coins. ChipMixer for example has a very unique system where you get 'preloaded' private keys.
This basically gives you outputs which are older than your transaction. This means that the UTXO's you get are older than the UTXO's you create when sending your coins to the mixer.

Then you are free to redeem them whenever you want.
I am not sure if that's what you are looking for, since you won't be able to really 'trace' them (because there is no link between those transactions).

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November 16, 2018, 05:29:05 PM
 #7

Hello all,

For educational purposes I'm looking a few example tumbler transactions. Sadly I'm having a hard time finding any, so I would very much appreciate a pointer in the right direction. Students will use the transaction hash with some block traverses to experience how hard it can be to unravel a mixer.

Perhaps you are talking about "CoinJoin", which is a process that combines transactions from many people. Here is a good article with links that might have some examples: https://bitcoinmagazine.com/articles/coinjoin-combining-bitcoin-transactions-to-obfuscate-trails-and-increase-privacy-1465235087/

"Mixing" is something else involving secret off-chain transactions that break the associations implied by on-chain transactions.

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November 16, 2018, 05:57:51 PM
 #8

Thanks for the replies. The goal is not to break the mixer, but the opposite. They will trace some coins and end up at the mixer, at which point they will find out they are stuck. I image someone not posting his own mixer transaction, as that obviously creates traces back him, but maybe someone stumbled upon someone else's?  I'm having a look if wasabi has some examples.

There are several transactions of Chipmixer available to look at.

Here's one; https://www.blockchain.com/btc/tx/0922c91e53fccef2a8db533d7af2722ff99335b41fa130ec4af60c999675a56e

Or another one with lower inputs here, https://www.blockchain.com/btc/tx/88544cfdc9894007a0afc32d6d02934df913e9ab08dcdadfc778880264cca59e, and here https://www.blockchain.com/btc/tx/85e67e1fedcfe55aacd373fba0fe4101360d2e6fdaaf3020fcddf6c652305f30

Is this what you're looking for?

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