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Hi everyone, I just wanted to show off our new Zcash sidechain.

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So, this software is primarily for Linux, but if you're running Windows, you can use
a free piece of software, VirtualBox.

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I think Mac users have better experience with a different piece of software, but its
name escapes me right now.

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But once you have this thing, you can make little computers within computers, and
you can put Linux on there.

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This is Ubuntu, that's a version of Linux. All this is free software, so it's kind
of a neat trick.

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Once you get all that set up, you want to open up your Linux operating system, and I
have that here.

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And then you want to go to the internet and download, this is the drivechain.info
releases page, this little trophy.

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Here's where we host all the software files.

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You need to get the mainchain, and you need to get zside if you want to use it.

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We will put the latest version up here when it's ready, and I've downloaded them
all.

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When you get them all, they'll be in these tar.gz files, that you'll have to open
and then extract.

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They're compressed to save space, but you're going to uncompress them into these
folders.

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Now we're just going to run them all and take a look at them.

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To do that, you go into this bin folder for binary files, and you open a terminal
window.

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The Qt is the graphical user interface, so this is the one that you want with a Q.

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This is what it looks like when the blockchain is blank.

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We want to run it in something called write-test mode, so that we're all on our own
and we can just generate blocks as much as we want.

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We'll be God over there.

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This is the first piece of software. It looks just like Bitcoin Core, except it has
the sidechains tab.

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There's no sidechains here yet.

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We're going to add them now.

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Now we go into this second folder for the testchain.

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We're going to give this a run.

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Then we're going to do the same thing with the last piece of software, which is
zside, which is what we really want to look at today.

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This is all three softwares with no blocks and a brand new version of the
blockchain.

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I'm going to move all this stuff so that we can take a better look at it soon.

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Now we have three pieces of software. This is the mainchain.

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This would be Bitcoin Core 16.99 with BIP300/301 activated on it.

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We're in write-test mode for all three.

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This is the testchain. It's basically just a blank sidechain that does nothing, but
it can send and receive coins.

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This is zside. It has cool Zcash technology in it and a cool little user interface
that we built for that, which I think you're going to enjoy seeing.

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The first thing we have to do is, since sidechains are layer 2s, we have to link
them all up to our full node, which is this guy.

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This is the full node.

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There's actually a little trick for this.

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We have this little thing here.

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You have to restart, though. That's the only hitch. You have to close these pieces
of software down and restart them, which is a little annoying.

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Other than that, it's just clicking a button, which is pretty convenient.

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We use a command line to get them all back. We're on the same command as we did
before.

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Now they're all going to be connected. If you go to the parent chain tab, you see
that it's now connected to the mainchain.

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Now, since we're in write-test mode, we're going to be conjuring some blocks out of
thin air.

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On the debug window on the console, you can just make some blocks if you like.

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You can make as many as you like. Now we have coins.

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In particular, we're going to need to activate these sidechains, so we need some
information in order to do that.

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The sidechain parameters.

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Sidechain 0 is the test chain.

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We're going to add it.

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Create sidechain proposal.

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We will now click this button.

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We'll just do them one at a time, just so you can see them come to life.

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Generate another 20 blocks. Now it exists.

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Generate another 20 blocks. Now it exists.

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Now we will do zside.

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This is sidechain number 1. The sidechain has to know what number it is.

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Right now, you can only add them in order.

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It's much easier to add a sidechain in this test than it would normally be.

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We just shortened it for ease of testing and demonstration to 64 blocks, which is
obviously a very short amount of time.

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Anyway, now they exist.

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We will go to zside, parent chain, transfer.

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Here's all these ways of interacting with the sidechain.

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What we want to do now is transfer coins over.

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We're going to deposit to the sidechain.

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It gives us an address here.

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We can just copy it over and put it over here.

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Thanks to all these blocks I've been finding, I have all these coins.

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Let's just send 1,000 over.

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This thing will complain about the fee if it's set wrong because it's poorly
designed by whoever made it.

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It wasn't me.

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You have to type in some fee there.

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It can't be too high or too low.

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The other thing you need to do is, in order to find blocks, you have to enable Blind
merge mining.

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You have to go to BMM, Blind Merged Mining, and click Start.

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You can also do it manually, but I don't recommend that because it's pretty
confusing.

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We're going to mine blocks on the test chain as well.

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Why not?

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Oh, that's what I said not to do.

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Okay.

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Now we have...

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The blocks are being...

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It's going to try to find blocks in concert with the mainchain.

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Now we're going to generate...

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It's going to generate one block at a time.

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As you can see, we find a block here.

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We have a little thing here that you may be able to see.

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237 blocks.

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Now we have one block on Z side.

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And we also have one block on the test chain.

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So...

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The deposit can't go through until there's some confirmations on...

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At least one confirmation on both pieces of software.

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So, that was two blocks.

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And now it's over here as immature.

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We're going to keep finding blocks, block by block, until the coins become available
on...

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Z side, which they now are.

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So now we have our coins on Z side.

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And the coins are in a T address.

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Over here.

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That we can see.

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And we can see that it has two confirmations in this address.

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And if you want to shield these...

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You can use this Zcash tab to click shield.

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And shield a certain amount.

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So let's say you want to shield 40 coins.

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You click this button.

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And then it does some calculations.

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You know.

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In the background.

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But it's going to need more blocks to show up.

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On the right.

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Which is where it belongs.

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Now that it's a Z address.

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So you can see it went down to 659.

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The 40 coins are gone.

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But three blocks and then...

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Let's see, still three blocks.

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Let's see if we can get some...

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Five blocks.

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Here we go.

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And now you see 40.

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Minus the fee.

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As you may have noticed.

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This amount will be...

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There's a fixed shielding fee.

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In the world of Zcash.

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So let's do another example maybe.

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We'll do like 100.

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And we'll add the fee in.

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Put the fee in here.

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So that it comes out to a nice beautiful number.

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So we'll do that.

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And then we'll get more blocks on everything.

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When I do generate on the main chain.

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It's finding blocks on all the networks at once.

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You see even the test chain is going up to five.

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It's finding these blocks over here.

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Of course nothing has been deposited here.

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So there's no coins in the test chain.

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The parent chain on there knows.

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That there's a thousand coins.

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Here.

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So let's...

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Remember those calculations took a while.

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Oh this is funny.

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We've mined over here.

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We've mined the fee that it took to shield this.

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So we shielded this.

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And we also mined that.

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It showed up here as a...

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I forgot that that happened.

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So we should get another one.

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If we just keep mining.

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Keeps track of the confirmations.

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This is a change now.

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So it has less.

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So now we had our round number of 100 show up.

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And we should get another shielding fee.

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Should we not?

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So...

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Now we have some transparent coins and some shielded coins.

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And...

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We can...

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You know, send them around.

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Or...

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To another Z address and they'll be totally private.

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Or we can deshield them.

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So let's take...

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100 and we're going to say...

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Well we want...

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14 and then back.

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And we'll add the fee back in.

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Actually, I don't know what...

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I don't really remember where the fee will come out.

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So we'll see what happens with that.

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But it will come out to a new T address for us.

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When it does these operations,

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you can click this button

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and look at the history of what happened.

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Because it's kind of actually confusing

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without this button, so we added it.

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To figure out what's going on.

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Now we need some more blocks.

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And we deshield.

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So we're just going to find more blocks.

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You can see how the number of confirmations keeps going up.

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Keeps driving up the confirmations.

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Coins have.

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Great.

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Almost.

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There.

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Oh, we saw that vanish from that.

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Now we have...

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Success, success, success.

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Our 100 output is gone.

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Will it give us a new...

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There it is.

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85.9999.

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And 14.

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Oh wait, that's the shielding.

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Oh, there it is.

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14, 859, and then three of these.

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Okay, now.

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This is important.

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Because most of the people who use

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Zcash

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actually screw up

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and leak all the privacy

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that normally would have been added.

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So we've reduced...

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To stop the user from screwing it up

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we've reduced it to two steps called Melt and Cast.

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Now all you have to do is click Melt

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and it will shield

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all of your coins.

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And then you just click this button

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and then just wait.

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It won't... That's a good point.

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It won't shield these because

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it's so small that it can't pay the shielding fee.

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But it will melt all of your other coins.

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And then they'll show up over here

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this Available to Cast area.

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So let's mine some blocks again.

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And we'll just wait for them to show up.

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And remember it should be like 1,000, right?

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It was 1,000 coins.

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So okay, there they go.

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They've showed up.

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999994.

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Now what this is going to do is

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when you click Cast

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it's going to show the largest bills

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that are all powers of two.

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And it's going to remove them all

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on a given day.

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So these are fixed amounts.

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1, 2, 4, 8, 16, 32, 64, 128.

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And as you can see

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there's Saturday through Sunday

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and it's repeated again Saturday through Sunday.

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So what's going to happen is

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on this given day

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there's just going to be a lot of people

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de-shielding the coins

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that all have the exact same amount.

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A lot of people on Tuesday

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de-shielding 0.33554432

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in Bitcoin or whatever.

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It will then be impossible

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to determine

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whose shielding

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operations are associated

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with whose de-shielding operations.

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So I just click this button

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and it will then

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extract

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all these coins.

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So you start with 999

257
00:15:03,000 --> 00:15:05,000
and it's going to get D987.

258
00:15:05,000 --> 00:15:07,000
So if we get most of them

259
00:15:07,000 --> 00:15:09,000
sometimes it's luckier than other times.

260
00:15:11,000 --> 00:15:13,000
That's just a function of

261
00:15:13,000 --> 00:15:15,000
how close your

262
00:15:15,000 --> 00:15:17,000
balance amount is

263
00:15:17,000 --> 00:15:19,000
to some sum of

264
00:15:19,000 --> 00:15:21,000
four powers of two.

265
00:15:21,000 --> 00:15:23,000
So now that it's scheduled these four casts

266
00:15:23,000 --> 00:15:25,000
you can always cancel them of course.

267
00:15:25,500 --> 00:15:27,500
Now what happens when you

268
00:15:27,500 --> 00:15:29,500
end up de-shielding the coins?

269
00:15:33,500 --> 00:15:35,500
This has it queued up

270
00:15:35,500 --> 00:15:37,500
but it won't

271
00:15:37,500 --> 00:15:39,500
do it for a while

272
00:15:39,500 --> 00:15:41,500
so let's

273
00:15:41,500 --> 00:15:43,500
just manually de-shield some coins

274
00:15:43,500 --> 00:15:45,500
so that we have more

275
00:15:45,500 --> 00:15:47,500
so that we can withdraw a good amount.

276
00:15:47,500 --> 00:15:49,500
Let's take this and just de-shield 500.

277
00:15:49,500 --> 00:15:51,500
This is again not how you should

278
00:15:51,500 --> 00:15:53,500
de-shield but if you are determined

279
00:15:54,000 --> 00:15:56,000
to do so

280
00:15:56,000 --> 00:15:58,000
then you can do it anyway.

281
00:16:02,000 --> 00:16:04,000
Now I'm going to find

282
00:16:04,000 --> 00:16:06,000
two more blocks

283
00:16:06,000 --> 00:16:08,000
blah blah blah

284
00:16:16,000 --> 00:16:18,000
Oh yeah it takes a while to do those calculations

285
00:16:18,000 --> 00:16:20,000
to de-shield the

286
00:16:20,000 --> 00:16:22,000
coin.

287
00:16:22,500 --> 00:16:24,500
Here it is.

288
00:16:24,500 --> 00:16:26,500
Shields and now we have 500

289
00:16:26,500 --> 00:16:28,500
coins basically over here

290
00:16:28,500 --> 00:16:30,500
in the transparent world.

291
00:16:30,500 --> 00:16:32,500
So we want to take those coins back

292
00:16:32,500 --> 00:16:34,500
from Z-side

293
00:16:34,500 --> 00:16:36,500
back to the main chain

294
00:16:36,500 --> 00:16:38,500
and go back to transfer without a withdraw.

295
00:16:40,500 --> 00:16:42,500
And we have

296
00:16:42,500 --> 00:16:44,500
504 in the

297
00:16:44,500 --> 00:16:46,500
transparent balance

298
00:16:46,500 --> 00:16:48,500
so

299
00:16:48,500 --> 00:16:50,500
let's withdraw

300
00:16:51,000 --> 00:16:53,000
Oh whoops

301
00:16:53,000 --> 00:16:55,000
400 of that. I'll put that here where it belongs.

302
00:16:57,000 --> 00:16:59,000
And then main chain fee

303
00:16:59,000 --> 00:17:01,000
it's important to pay a good main chain fee.

304
00:17:01,000 --> 00:17:03,000
Let's make it 90

305
00:17:03,000 --> 00:17:05,000
and then the sidechain

306
00:17:05,000 --> 00:17:07,000
transaction fee can be pretty small.

307
00:17:07,000 --> 00:17:09,000
I'll just make that some random number.

308
00:17:09,000 --> 00:17:11,000
Then we have the total costs.

309
00:17:11,000 --> 00:17:13,000
Now we need a main chain

310
00:17:13,000 --> 00:17:15,000
Bitcoin address which

311
00:17:15,000 --> 00:17:17,000
we will get by going over here

312
00:17:17,000 --> 00:17:19,000
receive, click new a bunch

313
00:17:19,500 --> 00:17:21,500
of times. We'll copy it.

314
00:17:21,500 --> 00:17:23,500
We'll copy it over.

315
00:17:23,500 --> 00:17:25,500
Then we click

316
00:17:25,500 --> 00:17:27,500
withdraw.

317
00:17:27,500 --> 00:17:29,500
And then it says that this amount it doesn't like

318
00:17:29,500 --> 00:17:31,500
is prejudicial

319
00:17:31,500 --> 00:17:33,500
against this fee amount.

320
00:17:33,500 --> 00:17:35,500
Okay there we go.

321
00:17:35,500 --> 00:17:37,500
This fee estimation

322
00:17:37,500 --> 00:17:39,500
stuff sometimes.

323
00:17:39,500 --> 00:17:41,500
Okay so it's done

324
00:17:41,500 --> 00:17:43,500
that and you see the balance

325
00:17:43,500 --> 00:17:45,500
went down to 99.

326
00:17:45,500 --> 00:17:47,500
We now need to explore

327
00:17:48,000 --> 00:17:50,000
Go to the withdrawal explorer to see

328
00:17:50,000 --> 00:17:52,000
these withdrawals show up.

329
00:17:52,000 --> 00:17:54,000
So we're going to mine some more blocks.

330
00:17:58,000 --> 00:18:00,000
Okay here it is.

331
00:18:00,000 --> 00:18:02,000
It's programmed

332
00:18:02,000 --> 00:18:04,000
to wait to make the first one

333
00:18:04,000 --> 00:18:06,000
for there to be 10.

334
00:18:06,000 --> 00:18:08,000
So I'm just going to click this

335
00:18:08,000 --> 00:18:10,000
I'm going to make this really small and I'm going to click it 10 times.

336
00:18:10,000 --> 00:18:12,000
Since we have 99 coins.

337
00:18:12,000 --> 00:18:14,000
And we'll use

338
00:18:14,000 --> 00:18:16,000
a new address why not.

339
00:18:16,500 --> 00:18:18,500
Another burner.

340
00:18:18,500 --> 00:18:20,500
Just click this.

341
00:18:20,500 --> 00:18:22,500
1

342
00:18:22,500 --> 00:18:24,500
2

343
00:18:24,500 --> 00:18:26,500
And in practice there would be months

344
00:18:26,500 --> 00:18:28,500
between these so they would be accumulating.

345
00:18:28,500 --> 00:18:30,500
It's just this first one that's a little quirky.

346
00:18:30,500 --> 00:18:32,500
10 but we'll now check.

347
00:18:32,500 --> 00:18:34,500
So now we'll mine some blocks

348
00:18:34,500 --> 00:18:36,500
and this should all show up.

349
00:18:40,500 --> 00:18:42,500
28 blocks

350
00:18:42,500 --> 00:18:44,500
29 blocks

351
00:18:45,000 --> 00:18:47,000
And now we have more than 10

352
00:18:47,000 --> 00:18:49,000
Do we? I think so.

353
00:18:49,000 --> 00:18:51,000
So it should construct this

354
00:18:51,000 --> 00:18:53,000
WT Prime thing here.

355
00:18:53,000 --> 00:18:55,000
It says none yet.

356
00:18:55,000 --> 00:18:57,000
Waiting for withdrawals.

357
00:18:57,000 --> 00:18:59,000
Very accurate.

358
00:18:59,000 --> 00:19:01,000
Okay now it's made this thing.

359
00:19:01,000 --> 00:19:03,000
This thing is

360
00:19:05,000 --> 00:19:07,000
these rare Drivechain withdrawals.

361
00:19:07,000 --> 00:19:09,000
Now for testing

362
00:19:09,000 --> 00:19:11,000
we've made it short

363
00:19:11,000 --> 00:19:13,000
but it normally would take

364
00:19:13,500 --> 00:19:15,500
So here we have this

365
00:19:15,500 --> 00:19:17,500
we're back on our main chain screen

366
00:19:17,500 --> 00:19:19,500
you go Z side

367
00:19:19,500 --> 00:19:21,500
and then the deposit

368
00:19:21,500 --> 00:19:23,500
screen you can click this other tab

369
00:19:23,500 --> 00:19:25,500
it says see withdrawals

370
00:19:25,500 --> 00:19:27,500
and it will show you any withdrawals

371
00:19:27,500 --> 00:19:29,500
that are trying to get through

372
00:19:29,500 --> 00:19:31,500
and this one hasn't shown up yet because it was just made.

373
00:19:33,500 --> 00:19:35,500
But these pieces of software

374
00:19:35,500 --> 00:19:37,500
will be talking to each other.

375
00:19:43,500 --> 00:19:45,500
And you see here it is.

376
00:19:45,500 --> 00:19:47,500
And we've programmed it to expire after

377
00:19:47,500 --> 00:19:49,500
300 blocks and only need 140 blocks

378
00:19:49,500 --> 00:19:51,500
for testing and normally

379
00:19:51,500 --> 00:19:53,500
again it would be 6 months

380
00:19:53,500 --> 00:19:55,500
it would be 26,000

381
00:19:55,500 --> 00:19:57,500
blocks and change

382
00:19:57,500 --> 00:19:59,500
and this would be 13,150

383
00:19:59,500 --> 00:20:01,500
it would be a huge number.

384
00:20:01,500 --> 00:20:03,500
But you can see that this

385
00:20:05,500 --> 00:20:07,500
thing here has to match this thing

386
00:20:07,500 --> 00:20:09,500
this is the Drivechain security model

387
00:20:09,500 --> 00:20:11,500
does this and this match

388
00:20:12,000 --> 00:20:14,000
can we do anything about it in 3 months

389
00:20:16,000 --> 00:20:18,000
we have to click this gear

390
00:20:18,000 --> 00:20:20,000
since we're mining blocks over here

391
00:20:20,000 --> 00:20:22,000
we get to drive this around

392
00:20:22,000 --> 00:20:24,000
normally most users would not

393
00:20:24,000 --> 00:20:26,000
so we're going to set this to upvote

394
00:20:28,000 --> 00:20:30,000
and then we're going to mine a bunch of blocks

395
00:20:30,000 --> 00:20:32,000
we're going to mine 1

396
00:20:32,000 --> 00:20:34,000
you'll see it goes up from 1 out of 140 to 2

397
00:20:34,000 --> 00:20:36,000
and it goes up to 3

398
00:20:36,000 --> 00:20:38,000
and now we're going to type in a huge number

399
00:20:38,000 --> 00:20:40,000
like 100

400
00:20:42,000 --> 00:20:44,000
and it will go up by 100

401
00:20:44,000 --> 00:20:46,000
and now how many do we need

402
00:20:50,000 --> 00:20:52,000
and now

403
00:20:52,000 --> 00:20:54,000
we'll have let it go through

404
00:20:54,000 --> 00:20:56,000
so it's gone through and now we can see

405
00:20:56,000 --> 00:20:58,000
those coins somewhere

406
00:20:58,000 --> 00:21:00,000
if we look at the

407
00:21:00,000 --> 00:21:02,000
let's see if we can get this

408
00:21:02,000 --> 00:21:04,000
open here

409
00:21:04,000 --> 00:21:06,000
enable coin control features

410
00:21:06,500 --> 00:21:08,500
okay

411
00:21:08,500 --> 00:21:10,500
so now you can see

412
00:21:10,500 --> 00:21:12,500
the

413
00:21:12,500 --> 00:21:14,500
these 50's are all the coins

414
00:21:14,500 --> 00:21:16,500
that I mined

415
00:21:16,500 --> 00:21:18,500
let's see the confirmations

416
00:21:18,500 --> 00:21:20,500
I don't know why they say 25 at all

417
00:21:20,500 --> 00:21:22,500
oh I know what that is

418
00:21:22,500 --> 00:21:24,500
that's because of Blind Merged Mining

419
00:21:24,500 --> 00:21:26,500
is spending them and making all these change outputs

420
00:21:26,500 --> 00:21:28,500
so sorry about that

421
00:21:28,500 --> 00:21:30,500
it's confusing

422
00:21:30,500 --> 00:21:32,500
but at the end you can see

423
00:21:32,500 --> 00:21:34,500
that here are all these

424
00:21:34,500 --> 00:21:36,500
three confirmations exactly

425
00:21:36,500 --> 00:21:38,500
here's the 400 of what I sent

426
00:21:38,500 --> 00:21:40,500
before

427
00:21:40,500 --> 00:21:42,500
n2 by whatever

428
00:21:42,500 --> 00:21:44,500
that's this thing over here

429
00:21:44,500 --> 00:21:46,500
and all these n1g

430
00:21:46,500 --> 00:21:48,500
ka1

431
00:21:48,500 --> 00:21:50,500
those are all these other ones

432
00:21:50,500 --> 00:21:52,500
so you can see that I got the coins back over

433
00:21:52,500 --> 00:21:54,500
so that was the demo

434
00:21:54,500 --> 00:21:56,500
I hope you liked it