Value
Hold a digital asset yourself
Some users want part of their savings in an asset they can keep and move without the same chain of intermediaries.
Understand crypto
What is cryptocurrency? Understand crypto the simple way
This page covers blockchain, wallets, stablecoins, risks, security and how to get started properly without getting lost in technical jargon.
Independent guide, educational content, not financial advice. See the useful documentation.
BTC
ETH
SOL
Quick summary
What matters before you go further
- A cryptocurrency is a digital asset that moves on a blockchain.
- Not all cryptos do the same job: some are for value storage, some for payments, some for apps or on-chain services.
- Wallet, address, private key, seed phrase and network are the basics to understand before any first purchase.
- The risks are real: volatility, scams, wrong transfers and loss of access.
- Starting small and learning step by step is usually the healthiest approach.
- Deblock can be a simpler entry point if you want to discover crypto from an app also built for everyday use.
Read this first
- Educational content, not financial advice.
- Crypto-assets carry a risk of loss.
- A network mistake or transfer error can be irreversible.
- Never share your private key or recovery phrase.
Why it exists
Why cryptocurrency was created in the first place
Crypto did not appear just to create speculation. The first idea was to make digital value easier to own, move and verify on the internet.
Some people look at crypto as a way to hold part of their value in a digital asset they can move themselves.
Others are interested because the traditional system can involve delays, intermediaries, limits or more friction across borders.
The key idea is the shift from bank-to-bank rails to wallet-to-wallet transfers on a blockchain network.
That does not remove risk. It changes how access, ownership and transfers can work online.
A different logic
Bank -> bank
Intermediaries, opening hours, procedures and classic banking rails.
Digital value
Wallet -> wallet
Value sent to an address on a blockchain, with the rules of that network.
Blockchain simply
Blockchain in 3 simple ideas
You do not need to see blockchain as a mystery. The concept can be kept very simple.
Real use cases
What cryptocurrencies are actually used for today
The word crypto mixes very different things. Bitcoin, stablecoins, Ethereum and Solana do not play the same role.
4 concepts to know
The basics to understand before going further
These four ideas already prevent a large part of beginner mistakes.
Wallet
Wallet
Definition
A wallet is the tool you use to interact with a blockchain: check a balance, receive, send, sign and sometimes manage access.
Common mistake
Thinking the crypto lives inside the app itself. In reality, the wallet is mainly an access point to assets recorded on-chain.
Key takeaway
A wallet gives access to your crypto. It is not just a screen, it is a control point.
Address
Address
Definition
A crypto address is used to receive funds on a given network. Example of a fictional Bitcoin-style address: bc1qexample7h8k2m4r6t8x2z7w9k3q5u8n4p2.
Common mistake
Believing one address works for every blockchain. A Bitcoin address and an Ethereum address do not natively speak to the same network.
Key takeaway
Always check address plus network. That is where many irreversible errors start.
Private key
Private key / seed phrase
Definition
The private key is the real access to the funds. The 12-word or 24-word recovery phrase often lets you recreate that access. Example of a fictional Bitcoin private key in WIF format: L4mEXAMPLEprivateKey9w2f7qR1nX.
Common mistake
Sharing a seed phrase with a fake support account or storing it in a message, an email or an unsafe cloud.
Key takeaway
If someone gets your private key or recovery phrase, they can take your funds.
Network
Network
Definition
A network is the blockchain you are using: Bitcoin, Ethereum, Solana or another ecosystem. One app can support several different networks.
Common mistake
Sending the right asset on the wrong network and assuming it will still arrive correctly. That is not guaranteed.
Key takeaway
Before sending, verify the asset first, then the network, then the address.
Creating a wallet
BIP32, seed phrase, public key: what is really happening
You do not need to memorize everything to start, but this vocabulary helps you understand what you are really protecting.
Access custody
Custodial vs non-custodial: the real difference
This is not a religion war. It is mainly a difference of responsibility, simplicity and control.
Mots d’action
Acheter, envoyer, recevoir, swap : ce que ça veut dire au quotidien
Tu verras ces verbes partout. Les comprendre tôt aide à lire une app sans te perdre.
Market vocabulary
CEX, DEX, OTC: three words not to mix up
These terms mostly describe how you buy, sell or exchange. They do not guarantee a level of safety on their own.
Wallet types
Hot wallet vs cold wallet: when to use which
The right choice depends on your level, your amount and how much simplicity you need.
Ledger (partner link) https://shop.ledger.com/fr/pages/referral-program?referral_code=HSDFXPBVQMDWW
Start smart
How to begin crypto without burning yourself
The goal is not to move fast. The goal is to stay clear-headed, understand what you are doing and avoid expensive mistakes.
Discover without getting lost
Starting from a simpler app can remove a lot of friction
If you want to buy your first crypto without handling every technical layer on day one, Deblock can be a clearer entry point, with one app for daily money and crypto.
Account, card and crypto in the same interface
Buy, sell and convert crypto without multiplying tools
A more readable way to start before going deeper
La DeFi, simplement
La DeFi : ce que c’est, pourquoi ça existe, et pourquoi le risque monte vite
La finance décentralisée regroupe des services on-chain : swap, prêt, liquidité, staking, rendement, etc.
Écosystème Ethereum
Quelques protocoles connus à repérer sur Ethereum
Ces noms reviennent souvent dans l’écosystème Ethereum. L’objectif n’est pas de t’y jeter tout de suite, mais de savoir à quoi ils servent.
Liens externes vers des protocoles tiers. Chaque protocole a ses propres risques, interfaces et conditions.
DEXIntermédiaireSite officiel
Uniswap
Uniswap est surtout connu comme outil de swap on-chain et de liquidité.
LendingIntermédiaireSite officiel
Aave
Aave revient souvent pour le prêt et l’emprunt on-chain.
StakingIntermédiaireSite officiel
Lido
Lido sert surtout de repère quand on parle de liquid staking d’ETH.
LendingIntermédiaireSite officiel
Morpho
Morpho est souvent cité pour le lending network et certains vaults.
DEXIntermédiaireSite officiel
Curve
Curve est un nom important dès qu’on parle de stablecoins et de pools de liquidité.
Écosystème Solana
Quelques protocoles connus à repérer sur Solana
Solana a aussi ses grands noms. Les voir ici aide surtout à ne pas les confondre.
Liens externes vers des protocoles tiers. Ce ne sont pas des recommandations d’investissement.
SwapBaseSite officiel
Jupiter
Jupiter est surtout connu comme agrégateur de swap et de liquidité sur Solana.
LendingIntermédiaireSite officiel
Kamino
Kamino revient souvent pour le lending et des usages plus avancés sur Solana.
DEXIntermédiaireSite officiel
Raydium
Raydium est un repère important pour le swap et la liquidité sur Solana.
DEXBaseSite officiel
Orca
Orca est un autre nom fréquent pour le swap et les pools de liquidité.
StakingIntermédiaireSite officiel
Jito
Jito revient surtout quand on parle de liquid staking et d’infrastructure.
LiquidityIntermédiaireSite officiel
Meteora
Meteora est cité pour ses pools de liquidité et briques plus avancées.
Real risks
The crypto risks you should take seriously
The main danger is not only price volatility. Many losses also come from human mistakes, fake support and weak projects.
One mistake can be irreversible.
Volatility
An asset can rise quickly, but it can also fall sharply in a few hours or days.
Scams
Fake giveaways, fake wallets, fake advisers, fake Telegram groups or private messages remain common.
Wrong address or wrong network
Sending the right asset on the wrong network, or to a wrong address, can make the funds impossible to recover.
Lost seed phrase
Losing your recovery phrase in non-custodial mode can mean losing access to your funds for good.
Weak smart contract or platform
A code flaw, bad risk management or a fragile platform can create losses without warning.
Questionable token or project
Many tokens exist without strong use, durable liquidity or serious governance.
Basic security
The minimum checklist before a buy or a transfer
These simple habits already prevent a large share of the most common mistakes.
Secure your device first
Passcode, biometrics, session lock and updates are not optional.
Use 2FA when available
Two-factor authentication reduces the risk that a stolen password is enough.
Never share your seed phrase
No serious support team needs your recovery phrase or your private key.
Check address, network and amount
Read everything before confirming, even when the interface feels familiar.
Use bookmarks rather than ads
Type the official address or use a bookmark. Many scams begin with a fake sponsored result.
Be careful with suspicious airdrops
A token you did not ask for can hide phishing or malicious interactions.
Take your time
In crypto, moving too fast often costs more than missing an opportunity.
Simulateur historique
Si j’avais investi… voir un achat unique ou un DCA sans se raconter d’histoire
Le but n’est pas de promettre quoi que ce soit. Le but est de comprendre ce qu’un achat unique ou régulier aurait donné sur une période passée.
€500.00
Fais varier le montant pour comparer un petit test ou un achat régulier.
0.00%
Option purement indicative pour intégrer un petit coût d’entrée.
Résultat estimé
BTC
Achat unique
Pratique pour visualiser ce qu’un achat à une date précise aurait donné jusqu’à aujourd’hui.
Important
- • Simulation historique, pas un conseil financier.
- • Hors fiscalité, hors spread exact, hors slippage exact et hors garantie.
Chargement de l’historique…
Important
- • Simulation historique, pas un conseil financier.
- • Hors fiscalité, hors spread exact, hors slippage exact et hors garantie.
- • Les données de prix servent d’illustration et peuvent comporter des limites de source.
- • Une bonne performance passée ne dit rien de ce qui se passera ensuite.
Crypto FAQ
The most useful questions when you start
Short, clear and cautious answers about the topics beginners ask most often.
Is crypto legal?
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In many countries, yes, but the rules keep evolving. The key is to use serious services and stay aware of local regulation.
Is crypto anonymous?
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Not really. A better word is pseudonymous: your real identity is not always visible, but the masked identity and its transactions can be followed on-chain.
Can I lose my crypto?
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Yes. A price drop, a scam, a wrong address, a wrong network or a loss of access can lead to a partial or total loss.
What is a stablecoin?
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A stablecoin is a digital asset designed to stay close to a currency such as the euro or the dollar. It is often used to transfer value or stay in the crypto ecosystem with less volatility than Bitcoin.
What is a wallet?
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A wallet is the tool that gives you access to your assets on blockchain. It lets you receive, send and sign transactions.
What is a seed phrase?
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It is the 12-word or 24-word recovery phrase that often lets you recreate access to a non-custodial wallet. It must stay completely secret.
What is the difference between Bitcoin and Ethereum?
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Bitcoin is mainly seen as a digital store of value. Ethereum is more often used as the base layer for smart contracts and on-chain apps.
How can I avoid common scams?
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Take your time, verify the URL, never send your seed phrase and keep a simple security routine. For a broader reference, you can also browse the Deblock FAQ or see the official documentation.
Do I need to trade to get started?
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No. Starting slowly, with a small amount and a learning mindset, is often much healthier than jumping into trading.
For what kind of user can Deblock be useful?
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Deblock can be useful if you want to discover crypto from an app also designed for everyday money. To compare the framework, you can see Deblock plans or read our Deblock review.
Glossaire crypto
Le mini glossaire à garder sous la main
Ces mots reviennent partout. Les connaître aide à lire plus vite et à éviter les faux repères.
Cryptomonnaie
Actif numérique qui circule sur une blockchain.
Blockchain
Registre partagé qui enregistre les transactions.
Wallet
Outil qui permet d’interagir avec tes actifs on-chain.
Adresse
Identifiant de réception sur un réseau donné.
Clé privée
Secret qui donne réellement accès aux fonds.
Seed phrase
Phrase de récupération de 12 ou 24 mots.
Stablecoin
Crypto-actif pensé pour rester proche d’une devise.
DCA
Achat régulier d’un même montant pour lisser son point d’entrée.
CEX
Plateforme centralisée d’achat, vente ou conversion.
DEX
Échange décentralisé accessible depuis un wallet compatible.
Starting simply
Discovering crypto from one app can feel more reassuring
If you want to explore crypto from an app built for daily use, Deblock can be a simpler entry point: current account, FR IBAN, card and crypto in the same interface, without forcing you to become technical on day one.
FR IBAN and one app for everyday use
Buy, sell and convert crypto in the same interface
A clearer way to learn before making things more complex