Placeholder Image

Subtitles section Play video

  • There's Bitcoin.

  • There's Litecoin.

  • There's Ethereum.

  • So just what is cryptocurrency, and how does it work?

  • Essentially, it's digital money that's bought and sold online.

  • There's no bills or coins.

  • It's not based on another asset like gold.

  • And it doesn't go through traditional

  • financial institutions like banks.

  • Instead, these currencies operate

  • in a completely decentralized system

  • that uses so-called blockchain technology

  • to track transactions.

  • To see how this works, let's look at how

  • you'd buy something with cryptocurrency.

  • Say that Alice wants to buy a bike from Dan

  • using Bitcoin, her cryptocurrency of choice.

  • Alice begins by logging into her Bitcoin wallet

  • with a private key, a unique combination

  • of letters and numbers.

  • With a traditional financial transaction,

  • the exchange gets sent to banks on each side

  • who record the money being subtracted from one account

  • and added to another.

  • But remember, in this scenario,

  • there are no banks or middlemen.

  • Instead, Alice's transaction

  • is shared with everyone in the Bitcoin network.

  • These networked computers add Alice's transaction

  • to a shared list of recent transactions, known as a block.

  • Every 10 minutes,

  • the newest block of transactions is

  • added on, or chained, to all the previous blocks.

  • That's how you get a blockchain.

  • To ensure that each block of transactions

  • on the chain is verified,

  • a subset of Bitcoin's network joins a race

  • to solve a very difficult math puzzle.

  • And if they solve it first, their record

  • of the block of transactions becomes the official record.

  • They're rewarded with Bitcoins of their own,

  • and the network gets a new block on the chain.

  • This entire process is known as mining.

  • But instead of chipping away at rock,

  • you're solving complex puzzles.

  • The fact that many computers are competing

  • to verify a block ensures that no single computer

  • can monopolize the Bitcoin market.

  • To ensure the competition stays fair and evenly timed,

  • the puzzle becomes harder when more computers join in.

  • The Bitcoin protocol says mining will continue

  • until there are 21 million Bitcoins in existence.

  • That's set to happen around 2140 —

  • if Bitcoin lasts that long.

There's Bitcoin.

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B2 US TheNewYorkTimes cryptocurrency alice block transaction bitcoins

How Cryptocurrency Works | NYT

Video vocabulary