Go deeper: why "sound money" matters to crypto fans
A common argument for cryptocurrency is sound money: money whose supply cannot be arbitrarily inflated. Proponents argue that predictable scarcity preserves purchasing power over time and removes the political incentives around money printing. Critics counter that flexible money supply helps governments respond to crises, and that volatility makes crypto a poor unit of account today.
It’s worth separating two claims: (1) technological claims about how crypto works (verifiable, scarce, censorship-resistant) and (2) economic claims about whether that’s desirable. This course sticks mostly to the first; you should make up your own mind on the second.
In finance, "crypto" means cryptocurrency. In computer science, "crypto" means cryptography. Cryptocurrency borrows the name because it relies on cryptography — hashing, digital signatures, and zero-knowledge techniques — to secure itself.
This unit describes how cryptocurrency works, not whether you should buy any. Nothing here is financial advice.
Key takeaways
A one-page summary of What Is Cryptocurrency?. Print it for quick reference.
- Cryptocurrency is decentralized digital money on a peer-to-peer network — no central issuer.
- It differs from fiat in supply (often capped/predictable), ledger (public blockchain), and control (code, not policy).
- Key properties: decentralized, scarce/predictable, digital-native, peer-to-peer, censorship-resistant.
- Crypto is also "programmable money" — the same systems can run smart contracts (DeFi, NFTs, Web3).
- Separate technological claims (how it works) from economic claims (whether that’s desirable).
Unit check
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