Blockchain 101 - A Visual Demo Anders Brownworth English Chinese

Blockchain 101 - A Visual DemoYouTube↗ IA↗(long shot)
Science & Technology 1.8M views 51.9K likes 383 dislikes 05 Nov 2016 Show Contributors 12

Anders Brownworth 60K subscribers N/A YouTube↗

Contributed subtitles

English Alexandre Leite

Portuguese Fabio Gava

Korean jungsanghyo

Turkish nergiz ünal

Italian edoardo calia

Chinese UCBbsHVqqI83ufQ2MO--iaog

Greek Christos Magdalinos

Petros Symeonidis

Portuguese (Brazil) Alexandre Leite

Spanish (Latin America) Luis M. Garcia M.

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this is a blockchain demo

这是一个区块链演示

we're gonna do this in a very visual way though

我们会以非常直观的方式做到这一点

we're gonna make it very easy to understand

做到让它很容易理解

by stepping through the key pieces of

通过一步一步以可视化的方式进演示区块链的每个关键部分

what a blockchain is in a visual way but

来理解区块链是什么.

before we get started we need to take a

开始之前，我们需要先

look at this thing that we call a sha

看看这个我们称之为SHA的东西

ok and a hash this is this is one of

OK. 这里就是其中一个哈希

them right here

hash looks like a bunch of random

哈希看起来就像一串随机

numbers and essentially what it is it's

数字，本质上是

a fingerprint of some digital data and

某些数字数据的一个指纹

it just so happens it's a fingerprint of

它恰好就是这样一个

whatever i type in this box

无论我在这个盒子里输入什么的指纹

so if I type my name "anders" into

所以如果我在盒子里输入我的名字“Anders”

this box you see that the hash has

你看到哈希值也改变了

changed matter of fact it changed every

事实上我每次改变输入一个字母

time I typed a letter right so I'm going

HASH都跟着改变。

to go back to so it says anders okay so

现在退回去，输入anders， OK

this is a the hash of the name anders

这是名字anders的散列(HASH)

all lower case it starts with 19ea

都以19ea开头的小写字母

ok so if i delete that and I go again

OK，我删除再来一遍

type anders again you can see it starts

再次键入anders，你就可以看到以

with 19ea the same exact hash in that

19ea开头的完全相同的散列(HASH)

sense it's a digital fingerprint of this

从这个意义上说，它就是一个这段数据的数字指纹

data whatever data is here every time

而无论每次你输入的数据是什么,

you type exactly the same data you get

只要输入完全相同的数据你就得到

exactly the same hash and i can type

一个完全一样的散列HASH, 我可以键入

anything i want so I can you can have

任何想输入想输入的，如过空白什么都没有

nothing like this you know e3b0

像这样，你就知道e3b0xxx

that's that's the hash of nothing or you

就是什么都没有的散列(HASH)

could type tons and tons of stuff a

也可以输入成吨的的东西

matter of fact you could put like the

事实上，你可以输入比如

library of congress in here and you

国会图书馆的所有东西在这，你就会

would get a hash and the interesting

会得到一个哈希值. 有意思的是

thing about it is regardless of their if

there's a tiny amount of information no

有微量的信息，没有信息，或是

information or the entire library of

整个国会图书馆的

congress you're always going to get a

所有信息，你总是会得到一个

hash that is this long this many

这么长的有很多字符的哈希值

characters are you not going to be able

to pre guess what this is you kind of

事先猜到(hash)是什么，

have to put the library of congress in

你不可能把国会图书馆所有的信息输入到这

here to figure out what the hash is but

来推测出它的哈希值,但

you you'll always get exactly the same

你会永远得到完全一样的HASH

hash regardless of how many times you

散列，无论你输入多少次

put exactly the same information in so

完全相同的信息

what I'm going to do is extend this idea

我现在要做的是把HASH的这个想法

into something that we're going to

BLOCK块的东西

alright so let's take a look at a block

让我们来看看一个块(Block)

so this is a block and it's exactly like

这就是一个块，它与HASH看起来完全一样

the hash it's just that data section

只是数据部分

I've broken out now into three sections

分成三部分

one called block this is just some kind

一部分叫块, 这里只是某种

of a number this block number 1 a nonce

号码，这是区块1,

which is just yet another number will go

这是一个随机数, ,只是另一个数字

into what that is in a second and then

过会探讨随机数是什么

just some more data just very similarly

只是更多的数据, 与我们之前

to the way that we had it before

看到的样子非常相似

however the hash of this which includes

然而这(个块BLOCK)的散列(HASH)包含

all of this information up here is down

这的所有这些信息

here and it begins with four zeros you see that

在这里，它以四个零开头

it's a relatively unusual hash you know

这是一个相对罕见的散列，

most of them are not really going to

它们大部分都不是

start with four zeros like that but this one

以这样四个零开头，但是这一个

happens to and because it does totally

恰巧是，因为它完全

arbitrarily i'm going to say that this

随机的, 我们就说这个

block is signed

块被签名过的

ok so what would happen if i were to

OK，那么如果我要改变这里的任何一条信息，

change any one piece of this information

会发生什么？

let's say if i were to type something here

如果我在这里输入些东西

right the hash is going to change and

哈希将会改变,

what's the chance of that if i type

如果我输入字母的话，

letters this hash is going to start with

这个HASH散列以0000起始点机会会是多少?

four zeros pretty low it's probably not

可能性比较低,，也可能不可能

right so let's see what happens when i

让我们看看这么做的话会发生什么

do that i'm just going to say hi

我只是想打个hi

look at that right this hash does not

看看这个哈希没有

start with four zeros and so the big

起始不是四个零，所以大的

background here has turned red

背景变成了红色

so now you know that this this block

所以现在你知道这个

with this information in it is not a

含有这个信息的区块不是

valid or a signed block ok and that's

有效的或签名过的，这是

where this nonce comes in this

这个nonce随机出现这里的原因

nonce is just a number that you can set

Nonce（随机数）只是你可以设置的一个

to try to find a number that fits so

用来尝试找到的一个数字, 以使

that this hash starts with four zeros again

这个散列再次以四个零开头

alright so how do we do that well let's

那么我们该怎么做呢

start with one that start with now it's

现在从1开始

32 so that's not one let's try two FF

不行，试试2， FF NOW

3 4 5 6 so you get the idea like i

3 4 5 6, 你知道了怎么做

could sit here all there's one that

像我这样坐在这里

starts with 0 I can sit here all day

从0开始, 整天

typing these numbers and trying to

输入这些数字，并试图

figure out one that actually is going to

找出一个实际上能够

hash out to something that starts with

哈希出以四个0起始的哈希值

four zeros that wold take a long time so

要花很长时间

here i have my little

在这里，我有我的小

mine button i'm sure you've been wondering

挖矿(MINE)按钮，我相信你一直在想

what happens if i press that so what's

如果我按下会发生什么

going to happen when i press this mine

当我按下这个挖矿按钮时，

button is it's gonna run through all the

他就会遍历

numbers from 1 all the way up to try to

从1号开始的所有数字，试图找到

find one where the hash starts with four

找到一个以四个0其实的哈希值

zeros and this process is called mining

这个过程被称为挖矿

let's do it right now

让我们现在就做

now it's checking all of the numbers

现在它正在检查所有的数字

from 1 all the way up with their now

从1开始，一路向上，现在

it's stopped at 59,396 and that one

它停在59,396，那个数

just happens to hash out to something

正好碰巧哈希出

that starts with four zeros and it

以四个零开始的哈希值

satisfies my little definition of what

满足我对于

assigned block is ok so that's that's a

签名区块的定义，所以这是一个区块.

block now can you tell me what a

现在可以告诉我什么是区块链了吗?

blockchain is it's probably just a chain

区块链可能只是一个这些区块的链

of these blocks well how do you how do

怎么把他们放在一起呢？

you put them together let's let's do

让我们来做起来

alright so here's my blockchain I've

好吧，这是我的区块链

blocked number one has some kind of

a nonce just like before there's some

像以前一样有一个随机数

data area too but then it has this

也有些数据区, 但是它这有

previous here is a bunch of zeros let's

前一个,是一堆零

let's roll forward so this is block

让我们往下滚动，这是

two and block 3 and 4 this block chain

区块2，区块3，和区块4，这个区块链

has five blocks on it right the previous

有五个区块。这的前一个

here starts with 0000ae8 right is

以0000ae8开头

就是这个数字

ae8 and then this previous you know b90 is this one

ae8然后这个以前你知道b90是这一个

over here b90 so you can see that each

在这里b90所以你可以看到每一个

block points backwards to the one before

区块指向它前面的一个相邻区块

it

you remember that that first block over

你记得那个这里的第一区块

there actually is no previous so it's

实际上它没有前一个, 所以这

just a bunch of zeros it's actually just

只是一堆数字零它实际上只是

一个伪造的数字

ok so just like we did before what

好吧，就像我们之前做的那样

happens if I change some information

如果我改变一些信息会发生

here right it's going to change the hash

它将改变这个区块的哈希

of this block and it's going to

会使它失效

invalidate it right now let's try that

让我们尝试一下

so i'm going to type pie again sure

所以我打算再次输入pie

enough that block is invalid

足可以确信那个区块块会无效

alright just as we assume but what would

正如我们假设的那样，但是

happen i'm going to fix that now we'll

如何我要让它有效会发生什么？

go back to something that work what

现在回去做一些工作

would happen if I changed something in

如果我改变了这个区块里的一些东西，会发生

this block right it's going to change

这会发生什么. 它会改变

but this hash gets copied up to this

但是这个哈希被复制到下个块的这个

previous so it's going to it's going to

previous, 所以它也会

change this one to right so it should

把这个改成这个区块, 因此它

break both blocks so let me try typing

打断了两个块，让我尝试这里打入

hi in there and sure enough all right so

hi，确实确信对不

we can go back as far as we want you

我们可以回到我们想要的任何地方

know to some point in the past and

过去的某一个点

break that block and it will break all

打破这个这个区块，它将打破

the blocks since then everything before

从那以后的所有区块, 它之前的仍然

still green but this one is is red it's

还是绿色的，但是这个是红色的

so if i wanted to you know change

所以如果我想改变

something in this this block chain I

在这个区块块链中的某些东西我

could just go over to block number five

可以仅仅跳到5号区块

right here we could change it I'll put

就在这里，我可以改变它，我会放

hi and then we could remine it you

hi，然后我们可以重新挖矿,

know and pick a different nonce will do

选择一个不同的nonce, 现在就做

that right now and we could essentially

我们可以基本上

alter the chain so we've done it so that

改变链，我们做到了这一点

we should be good down right all right

我们做的很好对不？

well what happens if i go back in time

那么如果我回到过去，会发生什么

to hear and I break it here now i have

这里，现在我在这里打破这个链，现在

to mine this block which will pick a

我必须挖矿这个区块, 这个块将会选择一个

nonce that makes this block hash out to

nonce, 使这个块哈希出

four zeros if we can find one sometimes

四个零, 如何能找到,

it takes a while because it's gotta run

有时候它需要一段时间，因为它必须运行

through a lot of there it is it found

遍历很多，那里很多是它被发现

one at a hundred and thirty-eight

thousand alright but this one is still

，但这一个仍然是

broken because although this one starts

被打破的，因为虽然这个以

with four zeros adding the four zeros with

四个零其实，加上四个零的不同东西

different stuff up here still makes this

这里，仍然使这个

block hash out incorrectly so i also

区块是不正确的哈希，所以我也是

have to mine this block

必须挖掘这个块

alright and that takes some amount of

好吧，这需要一些时间

time that one was a little bit quicker

这个有一点点快

and then i have to mine this block to

然后我必须挖掘这个块

alright so what we're showing here is

好吧，我们在这里展示的是

that if i go and change this last block

如果我去改变最后这个区块

all i have to do is remine this block if

我所有要做的就是重新挖矿这个区块，

I go way back in time to back here and I

如何我改变过去时间的区块，这里

make a change like that i'm going to

have to mind this one this one this one

就不得不重新挖矿这个, 这个, 这个

and this one so the more blocks that go

这个，所以要跨过更多的区块，

by the more blocks in the past that we

过去的区块越多，

are the harder and harder and harder it

要改变一点就越来越难

is to make a change and so that

it's how a blockchain is going to resist

这就是区块链将如何抵制

mutation resist change

突变，抵制改变的机理

ok so now you like like you know

identify if if i do this in this block

here you can see that I've changed it to

在这里你可以看到我已经改变了

hi and I remine it blah blah blah how

hi, 并且我重新挖矿等等等等等等

would i know that my block chain has

我r如何知道我的区块链是否被重新

been remined all right let's take a look

挖矿过？让我们看看

at that I'm gonna hit this little

点击distributed按钮

distributed thing so now we have a just

现在我们看到了分布式区块链

distributed blockchain it looks exactly

分布式区块链, 看起与上一个区块链

like the last blockchain ok up to five

完全一摸一样，共五个区块

that but this is peer a the first peer

但是这个是PEER A

if you go down here you can see here is peer b

下面看到 PEER B

and it happens to have an exact copy of

它碰巧有一个完全同样的

the blockchain there's actually also

区块链拷贝, 实际上还有其他的

a peer c down here right this could go

PEER C，这里，等等

there's many many peers out on the

互联网上有很多很多PEERS

internet and they all have a complete

他们都有一个完整的

copy of the blockchain so in this case

区块链的副本，这个例子情况下

if i look at this hash it's 0000e4b

如果我看这个哈希是0000e4b

all right if I go down to this one I

好吧，如果我滚动到下一个

notice it also has e4b if I go

注意它也有e4b，如果我看

down to this last one it has e4b so they

直到最后一个它有e4b，所以他们

must be identical and i'm going to

一定是相同的，我马上演示给你们看

demonstrate that by going here and

到这里,并且

typing something i'll type hi again and

输入些什么，我会再次输入hi

then i will remine this block

然后我会把这个区块重新挖矿

I've got some other number now let's put

我现在得到一些其他的数字

some other number up here so i should be

在这里放上一些其他的数字，所以我应该

able to mine this block

能够挖矿这个块

okay now all the chains are green right

现在好了，所有的链都是绿色的

they're all green

他们都是绿色的

however this chain says the last hash is

然而这条链表明最后的哈希是

e4b the bottom one says that too e4b

e4b, 最底部也是e4b

and this middle one here says 4cae

这个中间的一个，在这里是4cae

so I know just by glancing at this one

所以我只知道看一眼最后

little hash that something is wrong in

一点点哈希就知道不对头

this blockchain even though all of the

这个区块链，尽管所有的

hashes start with four zeros I know that this one

哈希以四个零开头，我知道这个

is different and it's different because

是不同的，不同是因为

i have two it's essentially two against

我有两个一样的，对一个不同的

one we are a little democracy here right

在这里有一个小小民主表决

this guy argues that it's

这个家伙认为这是

e4b this guy argues that it's

e4b，这家伙认为这是

4ca and this one is e4b

4ca，这个是e4b

so e4b wins so that's how a

所以e4b胜利，这就是一个

completely distributed copy having a

完全分布式副本都拥有一份COPY

copy on many different computers they

在许多不同的计算机上，

can all very quickly see if all of the

他们都能够很快发现所有的区块

blocks are identical remember

块都是相同的

blockchains can have you know 4

记住区块链可以

500,000 blocks very easily so rather

轻易拥有400, 500千块，

than checking through all of them all

根本不需要检查所有的区块，

you really have to do is look at the

你只需要看看看

hash of the most recent one and you can

最近的一个哈希，你就可以

see that if anything in the past

发现过去任何东西，

anything way back here was altered you

是否有改变

can tell by looking at this at the last

仅仅看最后链中的一个就能看出来

block in this in the chain you know it's

going to hash out to something that

因为它会哈希出一个

doesn't start with four zeros and looks

不以四个零开始的值，并且

very different from what the hashes on

与好的链中的哈希值非常不同

the good chains are ok so that's a

所以这就是区块链

blocking that's the entire thing there

区块链全部就这么回事

is no more to it than that but it's kind

没有什么更多的了, 但是

of not really useful because we don't

如果数据区没有有意义的数据

have some something in this data area

区块链也没有什么用

that means anything i keep typing my

name or hi and that's kind of that sort

我输入的都是我名字，hi,

of irrelevant information so what we

都是些无关痛痒的信息，所以我们

really want is a token so let's do a

真正的想要一个token，所以我们来做一个

token on our blockchain all right now

区块链上的做个token

look at this so i have this token just

看看这个，所以我有这个token，

totally arbitrarily I'm calling these I

只是完全任意的，我把这些叫做

guess dollars right so we have

美元，所以我们看到

twenty-five dollars from Darcy to

从Darcy发送二十五美元

Bingley four dollars and twenty-seven

到Bingley ，有4美元27美分

cents go from Elizabeth to Jane you get the

从Elizabeth发送到Jane,

idea it's basically there's all these

基本上就是所有的这些

transactions that are happening and I've

正在发生的交易，我已经

just replaced the data with these

刚刚用这些交易代替了先前的数据

transactions and just like we saw before

就像我们之前看到的一样

you know so there's multiple blocks here

这里有多个区块

this one has more transact... it doesn't

这一个有更多的交易...

matter how many transactions there are

有多少交易不重要

there can be many or there can be few or

可以有很多或者可以有很少

none if we keep going forward here just

或者一个没有, 如果我们继续下去，

like we saw before

就像我们之前看到的

if we go down and we notice we have all

如果往下看，我们注意到我们都有了

these other copies of the same block

同一区块链的所有其它copies

chain right so now here's where the

所以现在不变性就

immutability is important if i change

的重要性出来了，如果我改动什么

something back here you'll notice that

回到这里，你就会注意到

this is you know a7fc blah blah blah

a7fc等等等等等等

something it's something else

这是别的东西

so it's something different than what's

这是一些与下面这里不同的东西

down here so in in this way I mean it's

所以从这个角度说，我们能够及时发现变化

very important that if i were to go back

就很重要，如果我要修改过去什么东西的话，

in time and change some value that we

would notice it's it's very important

with money that you don't lose track and

尤其是钱，非常重要的是你不至于失去跟踪

that's the whole point of using a

这就是使用区块链的全部意义

blockchain here this is a whole point of

这就是抵制任何形式的更改与变更的全部意义

resisting any kind of modifications you

know of things that have happened in the

你知道过去发生过的这种事情

past so that's the that's the reasoning

所以这就是使用区块链的背后原因

behind having using a blockchain to

使用区块链来

remember tokens now I one thing I would

记住tokens. 现在一件事情

mention here is that we're not listing

这里需要提及的是我们没有列出

you know Darcy has a hundred dollars and

Darcy有一百美元,

he's giving 25 of it to Bingley the only

并且他已经给Bingley美元, 我们

thing we're saying is Darcy gives 25 to

唯一说明的是Darcy给了Bingly 25美元

Bingley. We're not remembering a bank

我们不记录一家银行客户

account balance we're only remembering

账户余额，我们只记录

money movements. So this begs the

金钱的移动记录。所以这引起一个问题就是

question "does Darcy have $25?" Well we

“Darcy有25美元吗？”

have a problem here in this version

这是我们现在版本的blockchain

of the blockchain: we don't actually know

碰到一个问题：我们实际上并不知道

if Darcy has $25. So let's look at a

Darcy是否有25美元。那我们来看一个

coinbase transaction. So if we look back

基于coin的交易。所以，如果我们看看

here a coin base we're going to add a

这里是一个基于Coin的交易，我们将添加一个

coinbase transaction to our blocks and

基于coin的交易到我们的区块

this is this is very similar to what

这与是之前见过的非常相似

we've seen before but we're just adding

但我们只是在顶部添加

a coinbase at the top and what's that

添加一个coinbase

that what that's saying is we're going to

这里要说的就是我们要

invent a hundred dollars out of thin air

凭空创造一百美元

and give it to Anders and there's no

并把它交给Anders，这个区块里没有交易

transactions in this block because

nobody had any money previous to this. In

因为这之前没有人有钱。

the next block another hundred dollars

这下一个区块中，又有一百块钱

comes out of nowhere and goes to Anders i'm

凭空冒出来给Anders,

a fan I love it right I'll take a

我是一个粉丝, 我喜欢所以我收下

hundred bucks now we have some

一百块钱, 现在我们有些

transactions you can see that they're

交易，你可以看到他们

all from Anders, they're all from me because

所有都来自Anders，他们都来自我这里，因为

I'm the only one who has any money at

我是唯一一个这这个时刻有钱的人

this point. So I'm sending 10 of my

所以我送了10个

dollars to Sophie. Do I have ten dollars?

美元给Sophie。我有十块钱吗？

Yeah, I do, I look back and I see that

是的，我这样做，我回头看看

this coinbase transaction has given me a

这coinbase 交易给了我一个100块

hundred so I have at least 10 and I can

所以我至少有10个，我可以

send it on and you add all these up and

发送它，你把所有这些都加起来

他们不会超过100块

over a hundred and it follows sort of a

它遵循着一个基本的货币原则

basic rule of a currency that you

can't invent it out of thin air you can't

你不能凭空创造金钱出来

create money out of thin air you this

its dispersion is controlled so now if

现在它的发行是受控的

we look at this block chain that we've

如果我们看看这个我们创造的区块链

created and we zip forward in time and

并且我们在时间方向上快进

we notice that we see that Jackson is

我们注意到，我们看到jackson给

giving Alexa two dollars and so does

给Alexa两美元，所有

Jackson actually have two dollars to

杰克逊实际上有两块钱

give Alexa well we go back a block

给Alexa好，我们回塑区块

before we see that Emily had gotten ten

我们看到Emily已经得到10块

dollars from Anders gave 10 to Jackson

从Anders给了杰克逊10美元

and so Jackson does have the money so we

所以杰克逊确实有钱，所以我们

can just go backwards and and find that

可以倒退，并找到

that's actually one of the benefits of

这实际上是其中的一个好处

having a previous here it's easy to go

有一个以前在这里很容易回退

backwards we we just look for the block

我们只是寻找块

that looks like that that has that hash

看起来像那个哈希

and here it is right here right so you

这里就在这里，所以你

points two blocks back in time and

指向两个时间块和时间

allows us to trace the provenance of any

允许我们追踪任何的来源

coin that we want

我们想要的硬币

so that's a basic block chain and we're

所以这是一个基本的块链，我们是

running a currency on top of it and as

在它上面运行一个货币

you know blockchains are there many

你知道区块链有很多

copies everybody has a copy of it so if

复制每个人都有它的副本，所以如果

we mutate you know this and make it six

我们改变并使其成为六

dollars these go invalid it does not

美元这些去无效它不

agree with with these block chains down

同意这些块链下来

here these copies of the same block

这里是同一块的这些副本

chain down here so this resist tampering

链下来，所以这抵制篡改

which is what you want for a currency it

这是你想要的一个货币它

works very well for things that are

对于那些事情是非常有效的

small and transactional like this

小而且这样的交易

go ahead and fix that and they're

继续解决这个问题，他们是

just a very efficient way to

只是一个非常有效的方法

handle agreement on what has happened in

就发生的事情达成协议

the past as kind of this immutable

过去就像这种不可改变的样子

history that that goes down with

历史就是这样

time so that's a basic block chain and a

时间，这是一个基本的块链和一个

token on it there were glossing over

它上面的标记有总结

some main points but if you dig into the

一些要点，但如果你深入了解

demo and and click through these things

演示和点击这些东西

play around with it you get a better and

玩弄它，你会得到更好的

better idea of how this works there will

更好的想法，这将如何工作

be a part 2 where we go into a little

成为我们进入一点的第二部分

bit more detail about how the

有关如何更详细一点

transactions are created till then

交易创建到那时

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