Cryptocurrency Explained in Plain English: How Crypto Works
Cryptocurrency is digital money recorded on a shared ledger and controlled by private keys. How blockchains, wallets and consensus work, plus the main risks.
Video coming soon.
Key takeaways
- A cryptocurrency is a digital asset recorded on a shared public ledger called a blockchain, not in one company's database.
- A private key proves you own your crypto. Whoever holds the private key, or the seed phrase that creates it, controls the funds.
- Networks agree on transactions through consensus. Bitcoin uses proof of work, and Ethereum has used proof of stake since September 2022.
- Coins run their own blockchain, tokens are issued on another blockchain, and stablecoins are tokens designed to hold a steady value.
- Crypto payments are usually not reversible and not government insured, according to the FTC. Test with small amounts first.
Cryptocurrency is digital money that is recorded on a shared public ledger, called a blockchain, and controlled with secret codes called private keys. No bank keeps the record. Thousands of computers keep matching copies and agree on each new transaction.
That design changes who is responsible for your money. A bank can reverse a payment and replace a stolen balance. A crypto network usually cannot. This guide explains how blockchains, keys and consensus work, how coins, tokens and stablecoins differ, and the risks a beginner should know first.
How does cryptocurrency work?
Cryptocurrency works by keeping a shared ledger that every participant can check. Bitcoin’s own documentation calls the blockchain “a shared public ledger on which the entire Bitcoin network relies.” The ledger records every confirmed transaction, so anyone can see which addresses hold which balances.
New transactions are grouped into blocks. Each block stores a fingerprint, called a hash, of the block before it. Changing an old transaction would change that fingerprint and break every later block. That is why a confirmed record is very hard to rewrite.
What are private keys and addresses?
A private key is a secret number that lets you approve, or sign, transactions from your crypto address. Bitcoin’s documentation says the signature proves the owner authorized the transfer and stops anyone from changing it later.
An address is the public side. It works much like an email address: you share it so others can send you funds. Your wallet creates addresses from your keys.
Most wallets back up your keys with a seed phrase, a list of 12 or 24 words. Anyone who has the seed phrase can rebuild your wallet and move your funds. Our guide to what a seed phrase is and how to store it covers this in detail.
How do crypto networks agree on transactions?
Crypto networks agree on transactions through a consensus method, a set of rules that lets strangers settle on one shared record. The two most common methods are proof of work and proof of stake.
| Proof of work | Proof of stake | |
|---|---|---|
| Example | Bitcoin | Ethereum (since September 2022) |
| Who adds blocks | Miners using computing power | Validators who lock up coins |
| What it costs to take part | Hardware and electricity | Coins at stake (32 ETH per Ethereum validator) |
| Penalty for cheating | Wasted electricity and hardware | Part of the stake can be destroyed (“slashing”) |
| Block timing | About every 10 minutes on Bitcoin | Fixed 12-second slots on Ethereum (as of October 2026) |
| Energy use | High | Much lower, according to ethereum.org |
Some networks use other methods. The XRP Ledger uses its own consensus protocol run by validators, and Hedera uses a method called hashgraph.
What is the difference between coins, tokens and stablecoins?
Coins, tokens and stablecoins differ in where they live and what they are designed to do.
| Type | What it is | Examples |
|---|---|---|
| Coin | The native asset of its own blockchain, used to pay network fees | Bitcoin (BTC), Ether (ETH), XRP |
| Token | An asset issued on top of an existing blockchain by a project or company | Governance tokens, tokenized funds |
| Stablecoin | A token designed to hold a steady value, usually one US dollar, backed by reserves | USDC, Ripple’s RLUSD |
A stablecoin depends on its issuer. An April 2025 statement on stablecoins from SEC staff described the dollar-backed kind as redeemable one for one and backed by low-risk, liquid reserve assets. Holders rely on the issuer to keep those reserves and honor redemptions.
What is the difference between an exchange and a wallet?
A crypto exchange is a company that holds crypto for its customers and lets them buy, sell and trade. A self-custody wallet is software or a device that holds your own private keys.
- Exchange account. Easy to use and linked to your bank. The exchange holds the keys, so it can freeze withdrawals or fail.
- Hot wallet. An app on a phone or computer that holds your keys. You control the funds, but the device is online.
- Cold wallet. A device that keeps your keys offline. It suits larger, long-term holdings.
Our guide to cold wallets and hot wallets compares them in detail.
What are the main risks of cryptocurrency?
The main risks of cryptocurrency are price swings, permanent mistakes, scams and company failure. The Federal Trade Commission (FTC) lists three differences from cash and cards:
- Crypto payments do not come with legal protections like a credit card dispute.
- Crypto payments typically are not reversible.
- Crypto accounts are not backed by a government, unlike FDIC-insured bank deposits.
The FTC also warns that only scammers demand payment in crypto and only scammers guarantee profits. Sending to the wrong address, losing a seed phrase, or approving a malicious transaction usually cannot be undone.
A beginner’s checklist
- Learn the difference between holding crypto on an exchange and holding your own keys.
- Write your seed phrase on paper. Never type it into a website or share it with anyone.
- Send a small test transaction before any larger transfer.
- Treat any promise of guaranteed returns as a red flag.
- Keep records of every purchase and sale. The IRS treats digital assets as property in the US.
What to learn next
Once the basics are clear, the next step is practical. Read how to buy Bitcoin safely for a step-by-step process, or what XRP is and how it works for a closer look at one network.
Sources
Sources
- Statement on Stablecoins, U.S. Securities and Exchange Commission
- Digital assets, Internal Revenue Service
- What To Know About Cryptocurrency and Scams, Federal Trade Commission
- How does Bitcoin work?, Bitcoin.org
- Proof-of-stake (PoS), Ethereum Foundation
Frequently asked questions
How does cryptocurrency work in simple terms?
A cryptocurrency network keeps a shared record of who owns what. To send funds, your wallet signs a transaction with your private key. Computers on the network check the signature and add the transaction to the record.
Is cryptocurrency real money?
Cryptocurrency can be used to pay and send value, but it is not backed by a government. In the US, the IRS treats digital assets as property for tax purposes, not as currency.
What is the difference between a crypto exchange and a crypto wallet?
A crypto exchange is a company that holds your crypto for you and lets you trade it. A self-custody wallet holds your private keys yourself, so only you can move the funds.
What is the difference between a coin and a token?
A coin is the native asset of its own blockchain, such as bitcoin on Bitcoin or XRP on the XRP Ledger. A token is issued on top of an existing blockchain, such as a stablecoin on Ethereum.
Can a crypto transaction be reversed?
Usually not. The FTC warns that crypto payments typically are not reversible, so the only way to get funds back is if the person who received them sends them back.
Education and commentary only, not financial advice. Crypto is volatile and you can lose money. Do your own research and speak to a qualified advisor before making investment decisions. Figures are as of October 23, 2026 and may have changed since.
