All language subtitles for 001 What is IPFS and How It Works

The interplanetary file system, or IP office, is a protocol designed to create a permanent and decentralized

method of storing and checking files.

It is based on BitTorrent NGet index, used mainly for saving and delivering static content such as

images, videos, documents and so on.

Typeface, if built right, could complement or even replace ETP and build a better web.

Let's take a look at these characteristics.

First, you should know that the machine that runs IPIS software to store and retrieve files from the

APS network is called an IP address, not IP office is a peer-to-peer, decentralized and distributed

file system is a file system because it has directories and files that can be mounted expert appear

because there is no central server or single point of failure.

It uses a completely decentralized architecture for worldwide peer-to-peer file transfers.

IP office is a medium or content delivery network, once someone it's a file to the AP office locally,

the file will be available to the world immediately excursion friendly and uses the BitTorrent bandwidth

distribution.

IP office is also fault tolerant with zero downtime.

Once a file is added to an IP address node and requested by IP office clients, the file gets cached

by other networks as well, making it impossible to remove it.

So even if the originating node removes the file, the file will still exist on other networks.

Another characteristic is that IP office is censorship resistant.

It's like a permanent web.

Once a file was edited and kicked on the IP network, it cannot be deleted anymore.

It was shanked in blocks and already saved on tens of pigs that cannot be forced to remove the file.

For example, digging the block of Wikipedia in Turkey between 2017 and 2020, IP face was used to create

a mirror of Wikipedia, which allowed access to the content of Wikipedia despite the ban.

Of course, this comes with some legal issues as well.

No authority can force the network to remove a pirated file.

Now that we've talked about the basic characteristics of IPIS, let's move on and talk about content

addressing that is used by typeface versus location, addressing that is used by the traditional web.

Instead of referring to Phylis by location or which server they are stored on IPA, Facer refers to

everything Behesht meaning the content itself.

It works by taking a file and hashing it cryptographically.

So you end up with the unique hash of the file, which ensures that no one can create another file that

has the same hash.

And this hash is the address of the file.

So instead of talking to a server, we are talking to a specific piece of data and no one is really

interested in where the data is located.

Let's dive deeper into this and see an example I a file to the AP office network to do that, I'll run

some comments, but don't focus on them because we'll have plenty of time to test the comments in the

next lecture.

Just focus on the concepts in the current directory.

There is a file called Typeface that the and I'm going to add this file to the AP office network.

So I'm running through the typeface and in the name of the file.

Take a look at this piece of hash, it uniquely identifies the files in the first network and to access

the file, all we need is this hash.

We don't need the address of the machine that starts it.

What happened behind the scenes after Arenda comment is that the file was chunked in blocks, saved

locally in a folder, and will stay there until an IP based gateway will request the file by its content

identifier, which is the hash after the file was requested.

It will be saved in the gateways cache and be available to the whole world even if I shut down my machine.

When someone wants to access a particular page using the browser IP address will ask the entire network,

does anyone have the data that corresponds to this hash and node on typeface that contains the corresponding

hash will return the data allowing you to access it from anywhere and potentially even offline because

it was already cached locally.

This is really smart.

Using the browser on another machine.

I'll request the file.

So I'm writing IP address about how this is the main IP office gateway slash IP address and the hash

of the file.

So I'm going to copy the hash to ClipArt.

And I'm pasting the hash here, so slash and the hash.

And it was delivered.

This is the first contents.

Now I'm copying the same file to a Web server I control and I'm going to use SICP, so SFP the part

on which SSX license two two nine nine, the source file typeface.

I'm authenticating using the IP address of the server and I'm going to copy the file to the document

code of the Apache Web server.

So enslaver w w w slash ASML.

And the file is copied.

The access to the server was already configured in advance.

And I'm accessing the file using HTP and its location, so the servers IP address, I'm pasting the

address in the name of the IP address that not in the file was delivered.

Now, if I shut down the server, no one will be able to get to the file again.

So I'm shutting down the server.

This is the server Environics system still.

I mean, look at it.

Step up.

Fix it.

So the Web server was stopped and I'm refreshing the page.

And it's not working.

The site cannot be reached.

So whoever controls the location controls the content, the administrator of the location can dictate

who is allowed to access that information, can move the information without telling anyone, can destroy

the information, can collect data about anyone that accesses the information and can replace the information.

So HTP and ETPs are location based.

But if I shut down the first Dhiman, the file is still available on many other IP address nodes and

can be requested by anyone interested in it.

So I'm shutting down the IP office deman.

I'm pressing controversy.

And the demon was stopped and I'm requesting the file.

Again, I'm refreshing the page and the file is still available.

Anyone can get the file, even if the IP office demon was shut down.

At the end of this lecture, let's talk about peening, which is a key term of IP office, peening is

the mechanism that allows you to tell IP office to always keep locally a given object.

IP office has a fairly aggressive caching mechanism that will keep an object locally for a short time

after someone performs any type of operation on it.

But these objects may regularly get garbage collected or removed to prevent garbage collection simply

in the hish you care about.

Objects added through the Apophis comment are recursively by default and typeface file exists as long

as someone keeps it and a file from IP office is lost when there is no peer.

That source, that file.

So when there is no interest in the file anymore, we are taking a short break and in the next lecture

I'll show you how to install IP office on Linux.