What is a cryptocurrency?

Bitcoin, Ethereum, “crypto”… They’re words heard everywhere, between promises of fortunes and warnings of scams. But beyond the noise, what really is a cryptocurrency? At its core, it’s a completely new way of understanding money. Let’s explain it without jargon.

Digital money without banks

A cryptocurrency is a form of digital money: it doesn’t exist as physical bills or coins, only as electronic records. But it has a key difference from the money in your bank account: it’s controlled by no central bank or government.

Instead of a central authority keeping the accounts, cryptocurrencies work in a decentralized way: the network of users, spread all over the world, maintains and verifies the record jointly. The word “crypto” comes from cryptography, the mathematical techniques that make each operation secure and verifiable.

The key technology: the blockchain

The heart of almost every cryptocurrency is the blockchain. Picture it as a giant, public ledger in which all transactions are recorded.

Its features, as Britannica explains, are:

• It’s distributed: there’s no single copy, but thousands of identical copies on computers worldwide.
• It’s very hard to falsify: transactions are grouped into “blocks” linked to one another; altering one would require changing the whole chain in thousands of places at once.
• It’s transparent: anyone can consult the record, though identities are usually pseudonymous.

Thus, trust isn’t provided by a bank, but by the technology itself.

Bitcoin, the pioneer

The first and most famous cryptocurrency is Bitcoin, created in 2009 by a person (or group) under the pseudonym Satoshi Nakamoto. It was born with an idea: to create digital money that people could send directly to each other, without intermediaries. Its success opened the door to thousands of other cryptocurrencies (called altcoins), like Ethereum, with very diverse uses.

How they’re obtained and used

Cryptocurrencies can be bought on exchange platforms (with traditional money), received as payment, or, in some cases, “mined” (taking part with powerful computers in verifying transactions in exchange for rewards). They’re stored in digital wallets protected by keys.

Advantages and risks

Cryptocurrencies inspire enthusiasm and also caution. It’s worth knowing both sides:

• Advantages: fast, global transactions without intermediaries; direct control of your money; innovative technology.
• Risks: their value is extremely volatile (it can rise or crash within hours); there are scams and fraudulent projects; little or no protection if something goes wrong; high energy consumption in some.

That’s why experts advise getting well informed and never investing more than you’re willing to lose.

A revolution still underway

Cryptocurrencies are one of the most disruptive inventions of recent decades: money without banks, based on mathematics and a worldwide network. It’s still a young technology, full of promises and risks, and its future is yet to be defined. Understanding what a cryptocurrency is and how it works is the first step to looking at this new territory of digital money with judgment —neither with blind euphoria nor with fear.