What Is Crypto? Part Two

In Part One, we covered the basics: cryptocurrency is digital money secured by cryptography, and much of it is designed to be decentralized: controlled by a spread-out network of computers instead of one central authority.

That explanation was accurate as far as it went. But it left out something important: decentralization is a spectrum, not a guarantee. Just because something is called a “cryptocurrency” doesn’t mean it works the way Part One described. Some crypto projects are highly decentralized. Others are decentralized in name only. Some aren’t decentralized at all.

Before you read about, buy, or use any cryptocurrency, it helps to know which kind you’re actually looking at.

Decentralization Is a Spectrum, Not a Checkbox

Picture a scale. On one end, you have projects where thousands of independent computers around the world, run by many different unrelated people, all have to agree before anything changes. No single person or company could shut it down or rewrite the rules, even if they wanted to.

On the other end, you have projects that use the same basic cryptographic techniques (wallets, keys, a shared ledger) but where control is actually concentrated in the hands of one company, one founding team, or a small group of insiders. The “notebook” might technically be copied around, but one party can still freeze accounts, change the rules, or hold a majority of the supply.

Most real-world cryptocurrency projects sit somewhere between these two ends. Learning to ask “how decentralized is this, really?” is one of the most useful habits you can build as a beginner.

A few questions that help you locate a project on that spectrum:

• Who can process or approve transactions? Thousands of independent, unrelated participants, or a small number of servers run by one company?
• Who holds the tokens? Spread across many unrelated holders, or is a large share sitting in wallets controlled by the founding team or company?
• Who can change the rules? Only if a broad, independent network agrees, or can one company push an update unilaterally?
• Can anyone freeze or reverse a transaction? In a highly decentralized system, generally no one can. In a centralized one, the issuing company often can, by design.

None of this makes a project “bad”: some of these tradeoffs are intentional and disclosed upfront. But it does mean the word “cryptocurrency” alone doesn’t tell you much. You have to look at the specific project.

The Major Categories You’ll Run Into

Here’s a plain-language map of the types of crypto projects you’re likely to encounter, roughly from most decentralized to most centralized.

1. Base-layer cryptocurrencies

These are independent networks with their own ledger, maintained by a broad, often global set of participants who aren’t affiliated with each other. This is the category most people picture when they hear “cryptocurrency”: money that isn’t issued or controlled by any single company. The degree of decentralization still varies project to project, and is worth checking rather than assuming.

Main risk: price volatility, and the general risks of any new or lightly regulated financial technology.

2. Smart contract platforms

Some networks do more than move money around: they can run small programs, called smart contracts, that automatically execute agreements (“if X happens, automatically do Y”) without a middleman. These platforms have their own cryptocurrency, used to pay for running those programs.

This is a genuinely useful piece of technology, but it adds complexity: the platform’s security depends not just on its network, but on the code quality of every smart contract built on top of it. A bug in a smart contract can be exploited even if the underlying network is sound.

Main risk: smart contract bugs and exploits, in addition to ordinary volatility.

3. Company-issued tokens (including most “stablecoins”)

Many tokens are created and controlled by a specific company, even though they run on blockchain-style technology. The most common example is a stablecoin, a token designed to hold a steady value (often pegged to $1) because the issuing company holds real dollars or other assets in reserve to back it.

These can be genuinely useful, since stable value is convenient, but they reintroduce the exact thing decentralization was meant to remove: you’re trusting one company to actually hold the reserves it claims to hold, to manage them responsibly, and to allow you to redeem your tokens. That company can typically also freeze specific wallets if required to by law or by its own policies. In the US, the GENIUS Act of 2025 now sets rules for licensed issuers of payment stablecoins, including full one-to-one reserves, but the framework is still phasing in, and you are still trusting the issuer to comply.

Main risk: counterparty risk (trusting the issuing company), and the possibility the company isn’t fully backing the token as claimed.

4. Exchange and platform tokens

Cryptocurrency exchanges and other companies sometimes issue their own tokens, often to offer fee discounts or other perks to users of that specific platform. These are typically centralized by design: the issuing company controls supply, rules, and often a large share of the tokens.

Main risk: the token’s value is closely tied to one company’s success, policies, and continued operation.

5. Meme coins

Meme coins are tokens created around a joke, a piece of internet culture, or a community, with little to no underlying utility or technology beyond “it’s a cryptocurrency token.” Some meme coins are simple to create (often taking a developer very little time or cost), and it’s common for a small handful of early holders to control a large share of the total supply.

That concentration matters: if a small number of wallets hold most of the coins, they can have an outsized effect on the price, including selling large amounts at once. Meme coins can and do see enormous, rapid price swings in both directions, often driven by social media attention rather than any underlying activity.

Main risk: extreme volatility, low or no underlying utility, high concentration of ownership, and a meaningfully higher chance of scams (sometimes called “rug pulls,” where creators abandon a project and the token’s value collapses).

A Simple Framework for Evaluating Any Cryptocurrency

Whenever you come across a new cryptocurrency, whatever category it falls into, it’s worth pausing on a few questions before forming an opinion about it:

• Who actually controls it? A broad, independent network, or a specific company/team?
• What is it for? Does it do something (secure payments, run smart contracts, hold stable value), or is its main feature simply that it exists and has a name?
• Who holds it? Is ownership spread across many unrelated people, or concentrated in a few wallets?
• What happens if the team disappears? Does the network keep running on its own, or does the project depend on one company or group staying active?

None of these questions have a single “correct” answer that applies to every project. The point isn’t to declare one category good and another bad. The point is that “cryptocurrency” is a broad umbrella term covering projects with very different levels of decentralization, very different purposes, and very different risk profiles. Treating them as interchangeable is one of the easiest mistakes a beginner can make.

Next up: How to Buy Cryptocurrency walks through actually getting some, followed by Part Three, which covers wallets: what they actually are, and a risk-free way to practice using one.

This article is for general education only and isn’t financial advice. Cryptocurrency values can be highly volatile, ownership concentration and issuer practices vary by project, and anyone considering buying, selling, or holding any cryptocurrency should do their own research.