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Now as we mentioned before the bitcoin ledger or the block chain is completely public and anybody can

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read it and analyze it.

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Now we also mentioned that in the blog chain in each entry there isn't a lot of information about the

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people transferring money but you'll see the addresses of the senders and receivers.

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So this is fine as long as these addresses are not linked to identities.

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Now there is a number of scenarios where you wouldn't want your address to be linked to another address.

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For example let's say you purchased your coins using a coin exchange that requires I.D. verification.

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In that case the address that the money will come from will be linked to your real identity.

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And you'll be sending it to your tails wallet that way.

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If anyone analyzes the block chain will easily be able to link your exchange address the one that you

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used to purchase the bitcoins and verified your I.D. with to the idea of the electronic wallet that

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you created on tails.

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And that way this address is linked to your identity and then any transactions you make or receive will

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be linked to your real identity.

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Other examples would be if you're sending money to another address that you're not sure if the user

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is practice improper OPSEC or if you're not sure if the user is using his money legally we can't really

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know what people do in their personal lives.

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So breaking the link between the sender and the receiver is not easy when it comes to bitcoins because

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the block chain is completely public.

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This is where tumblers and mixers come in play.

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The idea of this is very simple.

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First of all you send your coins to a server or a service that's available to a number of people not

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only you.

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And then this service will send your money to a different wallet this way you're breaking the connection

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between the sender and the receiver and you can actually link a number of mixers if you want.

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So you can send this to mixer number one mixer number two mixer number three and then to your wallet

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or to someone else's wallet and you can even do this to send money to your own wallet to hide the connection

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that you actually own both wallets.

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For example let's say you purchased money from an exchange that required you to verify your identity.

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You transfer that money to a wallet in here and then.

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So this wallet will not be linked to your identity.

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You send the money to a mixer and then the mixer will send the money or the coins to another wallet

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that you control.

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And this way it is very difficult to link the transaction that happened here with the transaction that

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happened here.

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Now the way mixers mix the coins differ depending on the mixer that you use.

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So some of them were literally just randomly select an equal amount of money that you sent from their

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own wallet and send it to you.

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Others will be mixing the money that they have with different exchanges and send it to you.

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There is others that will literally sell the money or the coins that you give them in coin exchanges.

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They use crypto stock exchange to buy coins and then send you the new coins that they bought.

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So again making it very very difficult to track some of them will split the payments and send it to

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you in a number of transactions instead of sending it in one transaction.

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Some of them will add a time delay to make it even more difficult to trace.

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So there is a lot of techniques that can be used but the whole idea is the same.

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You send the money to the mixer and you wait for the money to arrive in the second wallet because there

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are a lot of mixers.

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I can't really cover all of them.

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You can simply look in Dr. Koh or Google or any of the other search engines that I showed earlier in

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the course for bitcoin mixers and see all the options that you have and see how they work and compare

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them and then use the one that's most suitable for you.

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But in this lecture I want to show you three examples that are slightly different from each other.

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Therefore they can be useful in different scenarios.

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Now all of these mixers have a dark net and a clear net address.

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And if you scroll down on all of them you'll see both the clear net and the darknet addresses at the

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bottom.

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For some reason this one that I'm using right now the bitcoin down there.

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Dot com.

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The darknet address is not working.

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That's why I'm access in it over the clear net address.

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Now the cool thing about this one is it's actually very cheap.

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It doesn't charge you any fees.

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You only pay for transaction fees but it doesn't really do a lot of complex operations when mixing the

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coins you literally send the coins and then it sends you coins back into the other wallet breaking the

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connection between the sender and the receiver the next one is Beth mix the way this will work is you

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send the coins and they store all of the coins in one wallet.

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They mix the coins in that wallet and then they give you different coins into the second wallet.

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Now these guys do charge a little bit more but again they're fast enough.

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I should have also mentioned that bit laundry is pretty quick.

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It's pretty instant so it's much faster than a lot of other services.

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Now you should keep in mind the more complex the mixing process is the longer it takes to get your money

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because obviously there would be more operations involved.

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This leads us to a mixed update.

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Oh this is the most expensive service between the three but it is the most anonymous because when you

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send the coins to them they don't simply just mix it and send it back to you.

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They will use this to buy crypto from stock exchange and then send you brand new coins that they bought

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from stock exchange and from investors.

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Now with this the amount that you receive can also be split into a number of transactions a time delay

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can also be added to make it more difficult to trace these coins and link them between the sender and

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the receiver accounts.

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Last but not least I should also mention that there are a number of mixers that are related to darknet

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markets such as Helix.

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Now this is supposed to be a really really good mixer.

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The only problem I see with it is the fact that it is related to a darknet market.

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So the fact that you're going to be using this mixer sending or just receiving money from an address

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that's related to this mixer could raise a lot of question marks on why you're using a mixer like that.

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Therefore depending on your situation it might make more sense to use one of the ones that I'm showing

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you right here.

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And like I said there are lots of mixers out there.

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You should do your own research and see which ones fits your scenario best.

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Using them is pretty much the same.

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And in the next lecture I'm going to show you how to use mixed them just as an example.

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So you get an idea on how they work in general.