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Okay.

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So now that we have a basic understanding on how bitcoins work and how cryptocurrencies work in general,

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in the next lectures, I want to walk you through how to use cryptocurrencies and specifically bitcoins

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anonymously on the Internet and on the darknet.

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Now, first, before we can do anything, we have to create a wallet.

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What we mean by wallet is it's software that's going to hold our money or our cryptocurrency.

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Then we can use this wallet to send payments, receive payments, and so on.

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So you can think of it similar to the bank account that you get when you sign up with a bank or the

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dashboard that you get when you sign up with PayPal.

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Now there are a lot of web based wallets where you can access your currency online using a web browser.

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There are apps that you can get on your phones, and there are programs that you can install on your

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desktop computers.

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Now, since we're using tails, we're going to be using a wallet called electron that comes preinstalled

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entails.

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This is very important because as we know, Thales is a live operating system.

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It's amnesic.

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So if you install external programs, you'll have to install them every time you start Thales and less

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persistence is enabled.

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Another cool thing about Electron is it's really fast.

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It doesn't need to download the whole blockchain, which is pretty big.

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It uses an indexed version of it so you can use it as soon as you download or launch the program.

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And the wallets that you create with electron can be used from separate computers.

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So for example, if you destroy your Thales build, you can just go to another Thales and be able to

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restore your account and I'll show you how to do that later on in the course.

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Now let's go to Thales.

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And all of this will become much easier to understand as we do this practically.

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So the like I said, electron comes pre-installed with tails, so you don't need to install it and you

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can access it by going to applications, internet and click on electron.

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Now recently, a very dangerous vulnerability was discovered in a previous version of Electron, but

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this version was shipped with tails.

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And even though tails has been updated multiple times since that version, electron did not get updated

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because the latest version of Electron still doesn't have a Debian build, which is what tails is built

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on.

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So in this lecture, I'm going to show you how to manually install the latest version of Electron.

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And in the next lecture, we're actually going to use it now for you.

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In your case, you can launch it from here and follow what I'm going to show you in the next lecture.

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If the program gets stuck, then that means tails still doesn't include the latest version of Electron.

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And you'll have to come back to this lecture and install the latest version, as I'm going to show you

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right now.

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Now, to download the latest version of Electron, you need to go to their website electron dot org.

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I'll include that in the resources.

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We're going to go to downloads.

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And we're going to select the Linux image, the app image right here.

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One click and we're going to click on Save File and this will automatically be stored in our Tor browser

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directory.

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That's fine.

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And I'm going to click on Save and this will start downloading it for me.

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I'm also going to download the signature right here, so I'm going to right click this and save link

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as and again, this is going to my Tor browser directory.

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I'm going to click on Save and I'm going to scroll down.

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And I'm going to download the developer's public key by right clicking save link as.

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And again, it's going to go into my downloads and I'm going to click on Save.

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The reason why I downloaded the signature for the installer and the public key of the developer, Thomas,

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is because, like I explained earlier, when you download something from the internet, it can be modified

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by a number of entities.

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Therefore, where we downloaded the signature and we downloaded the public key of the developer and

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we're going to use the public key of the developer and the signature to verify that the file has not

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been tampered with since we downloaded it, since the developer signed it.

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I've actually explained how this works in details in my encryption section.

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So go back and revise that if this sounds a little bit vague, but basically right now I'm pretty sure

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the downloads are over.

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And if we go to my Tor browser directory, you'll see I have the program itself, this is Electrum,

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this is the executable.

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And we also have the signature for this program that has the exact same name as the program with the

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DOT ISC extension.

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And I have Thomas V dot a C file, which is the public key of the developer that made this program.

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So before I can do anything, I have to import this key right here to my keychain.

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And I showed you how to do that before.

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So I'm going to do it quickly.

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I'm going to go to my applications.

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I'm going to go to passwords and keys.

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I'm going to go to file.

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Import and I'm going to select the file, which is in my Tor browser, and it's this file right here.

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Thomas V dot ISC.

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Click on open, verify the details, click on import and this will import his key for me and to verify

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that I can go here and just look for Thomas.

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And as we can see, we have the developer key in here.

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So now, now that we have the key added, we can click on the signature right click it and open with

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verify signature.

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And this will give us a positive result if this executable right here did not get modified, since Thomas,

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the guy with the key, has created this executable.

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So we're going to click on Verify.

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And as you can see, it's telling us that this is valid.

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And like I explained before, don't worry about the untrusted part as long as it says it's valid.

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This means that the file did not get modified since it got signed by Thomas.

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So now we can go ahead and run this file and not worry about it because we know the file did not get

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modified since Thomas signed it.

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But before we do that, I'm actually going to copy this.

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And I'm going to put it in my persistent directory.

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So I'm going to right click here and paste.

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And the reason why I'm doing this, because, like, we know tails is live, it's amnesic.

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So every time we restart, all the files will be lost unless they are stored in the persistent directory.

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Now, if you don't have the persistent directory, that means persistence is not enabled for you.

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I cover this previously in the course, so please go back to that lecture and see how to enable this.

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Now also, before using electron, I'm going to go to applications and tails.

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We're going to click on Configure Persistence.

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I did cover this before, but I want you to make sure that personal data is enabled and if we scroll

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down, bitcoin client is enabled as well.

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And the reason why we need the settings.

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So when we create a wallet, the wallet information will be stored on this computer.

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So when we restart we won't have to restore the wallet every time.

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We'll just have to put the password.

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So I'm going to close this because everything is configured properly for me.

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And one last step, because I can run executables on Thales.

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This is a security measure that comes with Thales.

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You'll need to right click the file, go to its properties, go to permissions, and you need to check

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this box that says allow executing file as program.

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We're going to close this.

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And now every time you want to run electron, don't go to applications, internet come to persistence

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and double click this executable.

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Now, as you can see, the program has started.

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Now it doesn't have any wallets.

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That's why it's not asking us for a password or anything.

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But right now it's ready to be used.

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And in the next lecture, I'm going to walk you through the basics of this program, and we're going

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to create our first Bitcoin wallet.