Understanding crypto without the jargon
Bitcoin, blockchain, tokens and transactions: the basics to understand crypto before you invest.
The essentials
What is a blockchain?
Picture a ledger of transactions that many computers verify and keep a copy of. On Bitcoin or Ethereum, this ledger is public: anyone can check that a transaction was recorded without asking a bank for permission. A blockchain is not a magic vault, though, nor a guarantee that a project is serious. It shows what happened on the network; it doesn't tell you whether the token you bought was worth its price.
When Alice sends an asset to Bob, her wallet prepares a transaction, signs it with a secret key and broadcasts it. The network checks, among other things, that the signature is valid and that the protocol rules are respected. Once it's included, Bob can see the asset in his wallet or with a block explorer. The waiting time and fees depend on the network and how busy it is.
Transactions are grouped into blocks that are chained together: changing an old transaction would mean redoing every block after it and convincing the rest of the network. That's what makes the history so hard to falsify. For the details, see Blockchain explained: blocks, nodes and consensus.
Coin, token, wallet: three words to tell apart
- Native coin: the network's own asset. BTC on Bitcoin, ETH on Ethereum and SOL on Solana are used, among other things, to pay their network's fees.
- Token: an asset issued on an existing blockchain. Two tokens showing the same name can have different contracts; the name and logo don't prove authenticity.
- Wallet: an app or device used to manage keys and sign. Your crypto is recorded on the network, not "in your phone".
The same asset can exist on several networks. "USDC on Ethereum" and "USDC on Base" are not the same balance in the same place, even if the name and target value look alike. An address that looks the same on two EVM networks doesn't merge their balances.
The main families of crypto
There are thousands of cryptocurrencies, but most fall into a few broad families. Knowing them helps you understand what you're buying.
| Family | Examples | What it's for | Watch out for |
|---|---|---|---|
| Bitcoin | BTC | Transferring and storing value | Very volatile despite its age |
| Smart contract platforms | ETH, SOL | Running applications (trading, lending, games…) | Value depends on real network usage |
| Stablecoins | USDC, EURC | Tracking the value of the dollar or the euro | Depends on the issuer and its reserves |
| Application tokens | UNI, AAVE | Governance or use of a protocol | A project can lose its users |
| Memecoins | DOGE and thousands of others | Speculation, community | No activity behind them, high risk of total loss |
Market cap (price × number of units in circulation) gives an idea of a project's size. It says nothing about its strength: a token can have a high market cap on paper and very few real buyers. See Tokenomics: market cap, FDV, supply and unlocks.
Platform or personal wallet: who holds your crypto?
This is the most important question after "what should I buy".
- On a platform (exchange): you have an account and the platform holds the keys. It's simple, but you depend on it. In November 2022, the collapse of the FTX exchange froze its customers' funds.
- In a personal wallet: you hold the keys yourself. Nobody can freeze your funds, but nobody can recover them either if you lose your backup or sign a malicious transaction.
Many beginners start on a licensed platform, then move part of their holdings to a personal wallet once they've learned the basics. See Hot wallet vs cold wallet.
What a beginner should know before their first purchase
- Volatility is real. An asset can drop sharply; an advertised yield is not a guarantee.
- A transaction is usually hard to reverse. A wrong address or a fake site can cost you the amount sent.
- Account access and key ownership are different things. On a custodial platform, the platform holds the keys. In a personal wallet, you control them and you're responsible for the backup.
- Fees come in many forms. Deposit, trading, withdrawal and network fees, plus the gap between the buy and sell price, can add up.
A concrete example
You deposit €100 and buy an asset. The platform shows €99.60 after trading fees. If you then withdraw it to your wallet, it may charge an extra withdrawal fee. Finally, selling later means a new market price and sometimes new fees. So buying €100 doesn't mean holding exactly €100 of transferable assets, nor being able to get €100 back.
The first words to learn
- Seed phrase: the list of words that backs up a wallet. Never share it.
- KYC: the identity check required by platforms.
- Gas: the fees paid to the network to process a transaction.
- ATH: "all-time high", the highest price ever reached.
- DYOR: "do your own research", check for yourself before you buy.
The rest of the jargon is explained in the blockchain and wallets glossary and in Crypto slang: DYOR, NFA, WAGMI, FUD….
Where to go next
The beginner path follows this order: Bitcoin: how it works, then Wallet, private key and recovery phrase, then Buying your first crypto, then Sending crypto on the right network. Keep Securing your accounts and avoiding scams close at hand from day one.
Frequently asked questions
What is a cryptocurrency, in one sentence?
A digital asset whose transfers are recorded and verified by a network of computers, the blockchain, without a bank keeping the ledger. Bitcoin (BTC), Ether (ETH) and Solana (SOL) are the best-known examples.
Is crypto a scam?
Major networks like Bitcoin and Ethereum have genuinely been running for years, but the ecosystem has plenty of dubious projects and scams. The risk comes mostly from fake sites, promises of guaranteed returns and tokens with no use. Check a link with our crypto site checker and read Securing your accounts and avoiding scams.
Where should I start if I know nothing?
In this order: understand the basic concepts (this guide), learn what a wallet and a recovery phrase are, then buy a small amount on a licensed platform. The beginner path in the AddictCrypto guides follows this progression.
Can you lose all your money in crypto?
Yes. An asset's price can fall sharply, a platform can go bankrupt, and a wrong address or a hack is usually irreversible. Only invest an amount you can afford to lose, and learn to secure your access before increasing the amounts.