All language subtitles for Explained.S01E05.Cryptocurrency.720p.NF.WEB-DL

[narrator] Do you ever feel
ike you're being watched?

By big corporations? The government?

Banks?

Companies you've never even heard of?

Escaping that was the original promise
of the first cryptocurrency.

Bitcoin.

The beautiful anonymity of cash,

but cash that wasn't printed
by governments.

Instead, it was made by a bit of code...
powered by citizens of the internet,

and you could trust it.

Today, anyone can buy cryptocurrency.

A few signups,
type in your credit card number,

and trade in your money for digital cash.

Bitcoin got so popular,
that by the end of 2017,

it was as valuable
as the big banks it stood against.

And with a few more steps,

you can use Bitcoin to buy
what the majority of Bitcoin is spent on:

Illegal services.

Virtual currencies can pose challenges
for law enforcement,

given the appeal they have
among those seeking to conceal.

[narrator] There are now thousands
of cryptocurrencies,

like Ethereum, Litecoin, Ripple
and even a goddamn Dogecoin.

[woman] Dogecoin, you can buy them
on exchanges, you can mine them...

Now, it started off in 2013 as a joke
based on an internet meme.

Well, Dogecoin now is worth...

It kills me.

Dogecoin now is worth about
half a billion dollars in market cap,

which just blows my mind.

[narrator] Add them all up,

and people had bet half a trillion dollars
on something.

So what are they betting on?

[man] The world's largest bank account is
in our bank.

That account belongs to the US government.

Bitcoin doesn't constitute legal tender.

It's probably the biggest innovation
we've seen since the internet.

[man] Any money is counterfeit,
unless issued by the federal government.

The fundamental promise
of Blockchain is decentralization.

We're in the early days of Bitcoin.
We're in the mid-90s.

The only thing that's worse,
than having a few people control currency,

is having absolutely nobody
control a currency.

[narrator] To understand cryptocurrencies,

you have to go back to an earlier form
of digital money.

Diners Club was
the first-ever credit card,

and it advertised itself as the ticket
to a new modern lifestyle.

[Lana Swartz] In the 1960s,
the executives at Diners Club

talked about
how cash was not sufficiently modern.

It couldn't interface
with our fast-moving world.

[add presenter] Sign your way around
the world with Diners Club International.

[narrator] Credit cards were a revelation.

By 1970,
half of American households had one.

They freed us
from carrying around cash, everywhere.

And in the age of Amazon, Google
and Uber, there's no need for cash at all.

Until there is.

For as long as we've been tinkering
with computers, on any mass scale,

there's been a dream of digital cash.

A cash that would function like cash,
in the sense that it's non-traceable,

anonymous, instant,

free to use...

and, yet, would be able to interoperate
with computer networks.

In countries... that have dictators

or other negative influences
on the transactions in the country,

they can choose not to allow certain types
of transactions they don't want to,

and people can't spend their money freely.

[electronic music]

[narrator] A way to buy and sell things
online without Big Brother watching.

That's a lot harder than it sounds.

It's actually a problem that flummoxed
computer scientists for decades.

It even had a name:

The Byzantine Generals Problem.

A group of generals, each commanding
a portion of the Byzantine Army,

encircle a city.

They must decide
whether to attack or retreat.

But whatever they decide,

the most important thing
is that they reach a consensus.

But consensus is difficult to reach,

because the generals in this army
also can't trust each other,

just like we can't
trust each other... online.

A general might say they plan to attack,

when they actually plan to retreat.

And just one dishonest general
means everyone else dies in battle.

The generals had no choice,

but to route all of their battle plans
through a central authority.

That's also why a site like Amazon
needs to check with your bank,

to make sure you're good
for the money you promise to pay.

[Hunter Predergast] The internet at large
was built upon a paradigm,

that everyone was a trusted user.

Essentially, a government official
or a researcher at a university.

And this technology was built

with that fundamental set
of assumptions baked-in,

from the early days of the internet,
till now.

[narrator] It doesn't end there.

A lot of what we do online

is exchange things of value
with each other.

And since we needed third parties
to store and verify everything,

the internet filled up
with huge third parties.

The key point here is
that value exchange is not just money.

It is anything of value.

You are not Facebook's customer.
You are Facebook's product.

We've been effectively paying,
all these large behemoths, with our data.

[narrator] That doesn't always go well.

We didn't take a broad enough view
of our responsibility,

and that was a big mistake.

And it was my mistake.

[narrator]
Still, there wasn't much of an alternative

without a solution
to the Byzantine Generals Problem.

And then,
someone came along and solved it.

[woman] Satoshi Nakamoto.

-Who is Satoshi Nakamoto?
-Actually it doesn't exist.

It could be a woman.
It could've been a group of people.

Newsweek identified a man likely
to be the cryptocurrency founder.

[woman presenter]
He's a 64-year-old physicist, apparently.

I have nothing to do with Bitcoin. So, he's probably not the guy, I guess,

but we know that the real Satoshi Nakamoto
doesn't want to be found.

[narrator]
That guy did not invent Bitcoin,

and we may never know who did,

but they unleashed a cryptocurrency
that you could buy online

and then spend as freely and anonymously
as if you were using cash.

Satoshi's innovation, that powers Bitcoin

and all cryptocurrencies
that came after it,

is called blockchain.

A blockchain is a ledger of transactions,
much like a bank maintains,

but copies of that ledger are distributed
among computers all over the world,

automatically updating
with every transaction.

Think back to those Byzantine generals.

If their orders were recorded
on the blockchain,

each general would have a copy
of every other generals' battle plans,

always up-to-date and 100% verified. Maintaining this distributed ledger
takes a lot of work,

but it's no one's job to do the work.

Instead,
the system pays out cryptocurrency

to those who volunteer to do it.

For the first time,
you have a distributed network

to come to consensus about
what transactions happened on the network.

This allows for a trustless ledger,

a ledger where there isn't
a single central party maintaining it,

but rather,
a network of people maintaining it.

That's an incredibly powerful concept.

[narrator] Satoshi didn't  just solve
the problem of cash on the internet,

he had a solution for the problem
of trust on the internet, too.

Blockchain facilitates
an entirely different perspective,

which is that no one is a trusted user.

It facilitates a new type of interaction
that we've never before seen possible.

[narrator]
Bitcoin was blockchain's first trial run.

A money system with nobody in control,

no laws, and no regulations.

That's a wild experiment,
and its timing was impeccable.

Call it Nightmare on Wall Street:
The meltdown in the financial market.

[woman presenter] The Dow plummets
as the financial world is rocked

by the biggest bankruptcy in US history.

It seems every time you think
it's as bad as it could possibly get,

another disaster's just waiting
around the corner.

[narrator] A lot of people were angry
with their governments,

and pretty much everyone was furious
with big banks.

People were very aware at that time
that there was something broken

with the old, centralized,
architecture of money.

And it took off.

[narrator]
A new money? The press ate it up.

And they got even more excited
when huge online drug markets sprung up.

[man presenter] About $18 million

in Bitcoins seized, last fall,
from a website known as Silk Road.

[woman presenter] ...a $1.2 billion
online criminal marketplace.

[man presenter] ...where users could
anonymously buy heroin, LSD...

[woman presenter] In a couple of clicks,
drugs on your doorstep.

[narrator]
Bitcoin had made it to prime time.

Businesses began creating
their own cryptocurrencies

and selling the coins
as a way to raise money,

like shares on a stock market.

And people treated cryptocurrencies
like a stock market too,

investing in different ones,
trying to buy low and sell high.

[bit music]

[narrator] And over the last few years,
it's been pretty easy to sell high.

Before anything, it's a movement.

-Are you a millionaire?
-Yes. Many times over.

It feels pretty great. Not too bad for 19.

You can absolutely make a ridiculous
amount of profit in crypto.

What you wanna do, is make your money
in a concentrated position.

Put it into Bitcoin and HODL for now,

which means hold on for dear life.

Make a little bit of profits
on Bitcoin and then...

Everybody was like
"It's gonna burst, it's a bubble,"

but something told me to hold on,
and I'm glad that I held on to it.

"The revolution will be ushered in
by young cryptocurrency millionaires."

Who could they be talking about?

♪Dropping crypto knowledge
making the ladies go cray cray♪

[bit music]

[Bromberg] The same way gold's value comes
from people trusting the value of gold

Bitcoin's value comes
from trusting the value of Bitcoin

and using that as a place
to put existing monetary value.

It kind of just became a huge snowball,
and as it was going down a hill

it just kept getting more and more steam.

[narrator] In 2010,
when one Bitcoin was worth six cents,

50 Bitcoin would have been just enough
for a fancy cup of coffee.

At its peak in 2017,

those same Bitcoin
would have been worth $850,000.

That's an expensive cup of coffee.

[mysterious music]

[narrator] In January 2018,

cryptocurrencies crashed.

It may have been all the reports
of suspicious trading and fraud.

Some worried the government
might swoop in at any moment.

Or maybe it was general uncertainty

about how much this stuff...
was really worth.

Whatever the reason,

half the value of all cryptocurrencies
went up in smoke.

But there was an even easier way
to lose your money with Bitcoin.

Just forget where you wrote down
your password.

There's no way to reset it.

I just wish I could go back in time...

and not throw that drive away.

[narrator]
There are over 2.5 million lost Bitcoin,

which at their December 2017 peak,
were worth over $20 billion.

[Palmer]
The average person doesn't feel safe

controlling their own security
for all that money.

People are willing to rely

on what are in essence banks
for their Bitcoin,

which in a way,
defeats the whole purpose.

[add presenter] You can easily trade
money for cryptocurrencies and vice-versa.

[narrator] And a bunch of cryptocurrency
companies have lost huge amounts of money

to hacks and mismanagement.

[man presenter] A hack attack at Bitstamp,
the world's largest Bitcoin exchange.

MT.GOX lost three quarters of a million
Bitcoins that belonged to users.

[woman presenter]
Tokyo-based Coincheck was hacked

by almost $500 million in digital tokens.

[narrator] The computers working
to maintain the distributed ledgers,

they've been using more energy
than many countries.

Blockchain is very expensive,
and right now it's kind of slow.

[narrator] Visa's payment network can
process 24,000 transactions per second,

and Bitcoin, just seven.

Even though giant centralized institutions
sometimes abuse our trust,

they're also really convenient.

[seventies music]

The question really becomes

"What advantages do you get
from moving

a previously centralized service,
like Dropbox or Whatsapp messenger,

into a decentralized blockchain,
and does it really pay off?"

[narrator] But people are placing
a huge bet

that some of these problems will get fixed

and that blockchain will revolutionize
a lot more than just money.

It's just not clear what that is yet.

[Casey]
I don't know what's next.

In the same way that we weren't able
to predict Uber in the 90s,

I don't think we're able to predict
what new decentralized applications

are gonna emerge
out of this new... infrastructure.

[narrator] Cryptocurrency was
only the first experiment,

and it may not end up being
the revolution people hoped.

We will see regulations
start to come in.

People will have to start to obey
what the government says.

Much of this has not happened, yet.

We've been in
a little bit of a Wild West.

[narrator] We may have code that solves
the problem of trust on the internet.

We just don't know if trust is a problem
technology can ever truly solve,