Editor’s note: This is the final part of a 3-part series on building investing discipline — using crypto as the test case. Part 1 covered how to keep your emotions in check when volatility spikes and Part 2 covered how to read performance charts without falling into traps.

Every conversation about crypto seems to start with Bitcoin. But if you've bought crypto, there's a good chance you've at least glanced at other coins. Maybe you own some Ethereum. Maybe someone mentioned Solana at a dinner party. Maybe you've seen a coin with a dog on it that somehow has a multi-billion dollar market cap.

For longer-term crypto investors, it’s worth asking how these altcoins — that is, the crypto universe beyond Bitcoin — fit in. Here's a framework to get you started.

Bitcoin is still the anchor

While their use cases vary wildly, cryptocurrencies are all part of a movement to rewrite the rules of finance. The primary appeal is that there’s no central authority (like a government or bank) that issues or controls it. It’s decentralized, with transactions secured through cryptography and recorded on blockchains — operating systems akin to Windows or iOS for the crypto ecosystem.

Bitcoin, the first coin and blockchain, has the longest track record, so it’s been stress-tested across multiple market cycles (meaning swings from peak to trough).

Unlike with traditional "fiat" currencies (like the U.S. dollar or euro), there’s a fixed supply of 21 million Bitcoins (BTC). In other words, a central bank can’t continue to print more of them, so they can be an attractive hedge against fiat currencies losing value. For this reason, Bitcoin is sometimes described as a digital version of gold.

Bitcoin also has the largest market cap of any cryptocurrency and the clearest regulatory treatment: It’s classified as a commodity by the Securities and Exchange Commission and the Commodities Futures Trading Commission.

For investors who want crypto exposure without going too far down the blockchain rabbit hole, Bitcoin remains the default entry point.

Ethereum is No. 2

Ether is the second-largest cryptocurrency by market cap, (Ethereum is actually the blockchain network, and Ether (ETH) is the cryptocurrency.) It’s probably the most important altcoin to understand because it's fundamentally different from Bitcoin.

While Bitcoin’s fixed supply makes it primarily a store of value, Ethereum is used as more than digital money. It’s actually more like an infrastructure layer — a programmable platform on which developers build applications, issue tokens, and run smart contracts.

Much of the activity in crypto — decentralized finance, stablecoins, tokenized real-world assets (think property or bonds represented on a blockchain) — run on Ethereum or platforms inspired by it.

The altcoin universe: signal vs. noise

Beyond Bitcoin and ETH, there are millions of altcoins. Many of the coins launched during the 2020–2021 bull market have lost most of their value, reflecting how speculative excess tends to unwind as a natural part of a crypto cycle. In fact, a large share of crypto projects became inactive or failed within a few years, according to CoinGecko.

The projects that tend to last share a few characteristics: a genuine use case (beyond speculation,) an active developer ecosystem, meaningful liquidity and trading volume, and a track record of surviving at least one full market cycle.

Solana, for example, has built a significant ecosystem of applications and users – and survived a major stress event in 2022 tied to the collapse of the crypto exchange FTX. That's meaningfully different from projects that launch on hype and quickly disappear.

A practical allocation framework

Cryptocurrencies are highly speculative, and buying them comes with the risk of significant losses. But Bitcoin and Ethereum have demonstrated relative staying power, making them popular core holdings for long-term investors.

Smaller altcoins can potentially deliver outsized returns, but they carry meaningful risk too. When evaluating them, the most useful question is simple: What problem does this actually solve – and does it require a blockchain to solve it? If the answer to the second question is "not really," that's a red flag. Many crypto projects exist in part because issuing a token is a way to raise capital — not because a blockchain is essential to the product.

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