Cryptocurrency

The word describes a shape, not a quality. It covers assets with hard supply limits and assets minted at will, networks run by tens of thousands of volunteers and networks run from one office. Bitcoin's own whitepaper never uses the term, calling itself "electronic cash", and the category grew up around it afterwards. Treat "crypto" as a shelf label, then look at what is actually on the shelf.

How it works

Cryptocurrencies share three ingredients and differ in almost everything else.

Ingredient one is public key cryptography: control of an asset is proved by a signature from a private key rather than by an account name on a bank's system. Ingredient two is a shared ledger that participants can verify for themselves. Ingredient three is a rule for who gets to add to that ledger, and this is where the category splits. Bitcoin uses proof of work, where writing rights are bought with electricity. Ethereum switched to proof of stake in September 2022, where writing rights are bought with capital already inside the system. Many newer chains use a small validator set chosen by the founding company, which is a shared database with a token attached.

Issuance splits the category just as sharply. Bitcoin's schedule is fixed at 21 million with no mechanism to change it short of near-unanimous consent. Ethereum has no supply cap and adjusts issuance and burning through protocol upgrades. A token launched on a smart contract platform can have its supply set, minted, or expanded by whoever wrote the contract, sometimes after launch.

The history is short and instructive. Namecoin, the first alternative built on bitcoin's codebase, launched in April 2011. Ethereum's genesis block came on July 30, 2015 and turned the category into a platform for issuing new assets cheaply. Since then the number of listed assets has grown faster than the number of working products, and several of the largest have failed outright: Terra's algorithmic stablecoin collapsed in May 2022, and FTX, then one of the biggest venues for trading these assets, filed for bankruptcy on November 11, 2022.

Why this matters when you buy bitcoin

The word "cryptocurrency" is where most beginner losses start, because it invites you to reason about one asset using facts about another.

Every mainstream exchange is a crypto exchange, not a bitcoin exchange, and their interfaces are built to move you along the shelf. Binance lists hundreds of assets and prices spot trading from 0.1 percent; the trading fee is not the risk, the menu is. If you have decided to buy bitcoin, the bitcoin-only platforms exist precisely to remove that menu: Swan charges about 0.99 percent per purchase, Relai around 1 percent, and River offers zero fee recurring buys, all of them selling one asset.

The category label also drives regulation, and regulation reaches you as friction at the exchange. The EU's Markets in Crypto-Assets regulation, Regulation 2023/1114, applies to "crypto-assets" as a class: stablecoin rules took effect on June 30, 2024 and the rules for service providers on December 30, 2024. That is why a German or Irish exchange now asks the same questions whether you buy bitcoin or a token nobody has heard of. National regimes work the same way. India's flat 30 percent tax on gains plus 1 percent TDS applies to virtual digital assets generally, so the tax treatment of your bitcoin is set by rules written with the whole category in mind.

Finally, portfolio hygiene. Custody advice that is sound for bitcoin, such as using a hardware wallet, gets complicated for assets whose contracts can be upgraded or frozen by their issuers. Keeping bitcoin separate from everything else you hold is not tribal loyalty; it keeps one asset's failure from becoming your failure.

Sorting a market listing into three piles

Any exchange listing page can be sorted into three piles in about a minute, and the exercise is more useful than reading a hundred project descriptions.

Pile one is native coins of networks with their own security: bitcoin, and a handful of others. Ask who can change the supply and how hard that would be. Pile two is tokens issued on top of someone else's network: most stablecoins, most DeFi assets, everything created by deploying a contract. Ask who holds the keys to the contract. Pile three is claims on a company: an exchange's own coin, a wrapped asset, a yield product. Ask what happens if that company files for bankruptcy, and remember that FTX's own token lost essentially all of its value in the days around November 11, 2022.

Bitcoin is the only asset in pile one on most exchange listings that has never had a foundation, a company, or a founder able to intervene. That is the distinction the word "cryptocurrency" hides.

Cryptocurrency vs altcoin

Cryptocurrency is the whole category; altcoin is the part of it that is not bitcoin. The word altcoin dates from the 2011 wave of bitcoin codebase forks and carries an implicit hierarchy that some people object to, but it is descriptively useful: it separates the asset with a fifteen year track record and no issuer from several thousand assets that have neither. When a headline says "crypto rallied", check whether it means bitcoin, the altcoins, or an index that averages both into a number describing nothing.

Cryptocurrency vs token

Cryptocurrency in careful usage means the native asset of a network, while a token is issued on top of a network that already exists. The distinction is practical: a native coin's rules are the network's rules, whereas a token's rules live in a contract someone deployed and often retains the ability to change. Exchanges list both in the same table, which is exactly why the words are worth keeping apart.