Category: Ethereum

Bitcoin and Ethereum are the two giants of crypto, but they are not competitors in the same race. Bitcoin is digital money with a fixed supply; Ethereum is a programmable platform where applications run. Understanding the difference matters far more than picking a “winner”, because each one serves a different purpose — and many investors hold both.

The core difference

Bitcoin was created to be money: a decentralized store of value and means of payment that no government can print. Its rules are deliberately simple and almost never change. That stability is its strength.

Ethereum was created to be a platform: a blockchain where anyone can run programs (smart contracts). Its rules evolve constantly, and its value comes from what people build on top of it. That flexibility is its strength.

In one sentence: Bitcoin is digital gold, Ethereum is a global computer.

Supply and issuance

Bitcoin has a hard cap of 21 million coins. Around 19.9 million already exist, and the last one will be mined around 2140. This fixed scarcity is the core of its investment thesis.

Ethereum has no hard cap. Its supply is governed by the protocol and has gone through phases of inflation and deflation (when fees burn more ETH than is created). Scarcity is not built into its identity the way it is in Bitcoin.

Technology

Bitcoin uses proof of work: miners compete with computing power to secure the network. It is the most battle-tested blockchain in history, with over a decade without a successful attack.

Ethereum uses proof of stake: validators lock up ETH as a guarantee and earn rewards. It consumes over 99% less energy than mining, and it is the foundation of an entire ecosystem: DeFi, NFTs, stablecoins and Layer 2 networks.

That ecosystem is Ethereum’s real advantage: thousands of developers, billions in value and applications that Bitcoin simply cannot run.

Use cases

• Bitcoin: store of value, payments, savings in countries with unstable currencies. Simple, secure, predictable.
• Ethereum: decentralized finance, digital collectibles, token issuance, games, identity. A platform for building new financial services.
• Both: many investors treat Bitcoin as the “safe” crypto and Ethereum as the “growth” crypto, accepting different risk profiles.

Risks

Bitcoin’s risk is mainly market risk: its price is volatile, and its role as “digital gold” is still being tested in economic downturns. It also faces regulatory pressure in some regions.

Ethereum’s risks are bigger and more varied: smart contract bugs, hacks in the applications built on it, regulatory uncertainty around DeFi, and competition from other programmable blockchains (Solana, among others). More potential also means more surface area for things to go wrong.

Which one should you choose?

There is no universal answer, but there are sensible rules of thumb:

• If you want the most conservative crypto exposure: Bitcoin. Simpler thesis, longest track record, hardest supply cap.
• If you want exposure to the growth of the crypto industry: Ethereum. The industry’s applications run mostly on it or on networks connected to it.
• If you are a beginner with a small budget: start with Bitcoin until you understand the ecosystem, then decide if Ethereum’s added complexity is worth it for you.
• If you are not sure: many people hold both. The two assets have historically behaved differently, and diversifying between them is a common strategy.

FAQ

Is Ethereum cheaper than Bitcoin?

Per coin yes, but the price per coin is irrelevant: you can buy fractions of both. What matters is market cap and risk, not the price of one unit.

Can Ethereum replace Bitcoin?

No. They solve different problems. Even if Ethereum becomes more valuable, Bitcoin remains the reference store of value of the industry.

Which one is more volatile?

Historically, Ethereum has been more volatile in both directions. More upside potential, more downside risk.

Do I need both?

No. Many investors choose one based on their thesis. Holding both is diversification, not a requirement.

Which one is better for beginners?

Bitcoin, for its simplicity. Once you understand how a blockchain works, exploring Ethereum and its ecosystem becomes much easier.

Want to keep learning? Read what Ethereum really is and how smart contracts work, or how to buy your first bitcoins step by step.

Further reading

• Bitcoin.org: how Bitcoin works
• Ethereum.org: documentation and concepts

Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.

Smart contracts are the engine of everything interesting in crypto: DeFi loans, digital collectibles, decentralized exchanges. The name sounds intimidating, but the idea is simple: programs that run on a blockchain and execute automatically when conditions are met. Here is what they really are, what they can do and where the danger hides.

What is a smart contract

A smart contract is a program stored on a blockchain. Once deployed, it runs exactly as written: no one can modify it, stop it or censor it. When the conditions programmed into it are met, it executes automatically.

Think of a vending machine: you insert a coin, select a product, and the machine delivers it without asking anyone. A smart contract is a vending machine for digital value — except the rules are public, the machine cannot be opened, and it works the same for everyone on earth.

How it works on Ethereum

Ethereum is the network where smart contracts became mainstream. When you interact with a contract, you send a transaction with some ether (ETH) to pay the fee, called gas. The contract runs its logic on every node of the network, and the result is recorded permanently on the blockchain.

Because every node executes the same code, the result is verifiable by anyone. There is no hidden server and no company deciding the outcome. The code is the law — which is exactly why bugs are so dangerous: the code is the law even when it is wrong.

Real examples

• A loan protocol: you deposit collateral, and the contract lets you borrow up to a percentage of it. If your collateral drops too much, the contract liquidates it automatically — no bank involved.
• An escrow: a contract holds the money and releases it to the seller when the buyer confirms receipt. No lawyers, no waiting.
• A digital collectible (NFT): the contract tracks who owns what and transfers ownership automatically when someone buys.
• A token: the contract defines how many units exist and how they move between addresses.

These are not hypotheticals: they are the backbone of an industry handling billions of dollars.

Why they are not “legal contracts”

The name is misleading. A smart contract is not a legal agreement — it is code with rules. It does not care about your intentions, your circumstances or what you “meant”. If the code says X, X happens.

That is a feature (no one can cheat the rules) and a bug (no one can fix a mistake). If you send money to the wrong address, or a contract has a flaw, there is no customer support to call. The code does not negotiate.

The risks

• Bugs: a flaw in the code can let someone drain the funds. The industry has lost billions this way.
• Irreversibility: transactions and contract executions cannot be undone. A mistake is permanent.
• Complexity: contracts can interact with other contracts, creating chains of risk that are hard to audit.
• Scams: not every contract is honest. Some are designed to look legitimate and steal funds (rug pulls).

That is why security audits exist: independent experts review the code before large amounts are deposited. Audits reduce risk, but they do not eliminate it.

FAQ

Do I need to know how to code to use smart contracts?

No. You interact through applications (websites and wallets) that handle the technical part. But understanding the basics helps you avoid mistakes.

Can a smart contract be changed?

Once deployed, no. Some contracts include upgrade mechanisms, but those are explicit and come with their own risks.

Are smart contracts only on Ethereum?

No, but Ethereum is the largest and most established platform. Other networks like Solana also support them.

Can a smart contract hold my money forever?

Yes, if that is what the code says. That is why you should only use contracts that are audited and understood.

What happens if the code has a bug?

The bug executes like any other rule. If it allows funds to be taken, they are taken. This is the industry’s biggest lesson and its biggest pain point.

Want to see where smart contracts live? Read what Ethereum is and how the ecosystem works, or what DeFi is if you want to understand the applications built on top.

Further reading

• Bitcoin.org: how Bitcoin works
• Ethereum.org: documentation and concepts

Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.

They tell you that you can “park” your crypto and earn interest without doing anything. It sounds free, and that is exactly where the problem starts: staking is not a bank deposit, it is a way of participating in how a blockchain network operates in exchange for a reward. Understanding what happens to your money while it is “parked” is the difference between an informed decision and a nasty surprise.

What is staking

Staking is the security mechanism of networks that use proof of stake. Instead of spending electricity competing to solve calculations (as Bitcoin does), participants lock up their cryptocurrency as a guarantee. In exchange for that lock-up, the network pays them rewards and gives them the right to validate transactions.

The logic is simple: if your money is locked in the network, you want the network to work well. If you try to validate fraudulent transactions, the network penalizes you by taking part of what you locked (this is the famous slashing). The validator’s self-interest is aligned with the health of the network.

Ethereum is the largest network using this system since its 2022 upgrade, but it is not the only one: other networks including Solana, Cardano and Polkadot use variants with different delegation, lock-up and penalty rules.

How it works in practice

1. You lock up your tokens: you deposit them in a validator, either your own or a shared one (staking pool).
2. The network freezes them: you cannot spend them while they are staked. On some networks, unlocking takes days or weeks.
3. The validator works: it proposes and confirms blocks, earning rewards.
4. You get your share: the reward is distributed among those who contributed tokens, minus the validator’s commission.

Returns are expressed as an annual percentage (APY) and depend on the network and on how many people are staking: the more validators, the lower the reward per participant. On Ethereum it is in the low single digits; on smaller networks it can be higher, with more risk.

Direct staking vs exchange staking

• Direct staking: you control your tokens and lock them on the network. It requires more technical knowledge and, on networks like Ethereum, a high minimum (though pools solve that).
• Exchange staking: the platform does everything for you. More convenient, but your tokens are in the platform’s hands: if it goes bankrupt or freezes withdrawals, that is your problem.
• Liquid staking: you receive a token representing your position that you can use while your original money stays locked. Useful, but it adds layers of complexity and risk.

Risks almost nobody mentions

• The price can fall: rewards are paid in the cryptocurrency itself. A price decline can exceed the rewards. Calculate total returns in euros or dollars, including fees, not just the number of tokens.
• Locked funds: you cannot sell when you want. In moments of panic, exiting can take weeks.
• Slashing: specific protocol violations can destroy part of the stake. On Ethereum, ordinary downtime causes inactivity penalties, not necessarily slashing. Rules depend on the network.
• Platform risk: on exchanges, your staking is only as good as the platform’s solvency.
• Network risk: a bug or an attack on the network can devalue the whole system.

Staking vs mining

Mining (proof of work) and staking (proof of stake) are two ways of achieving the same thing: a secure network without a central authority. Mining spends electricity and requires hardware; staking locks capital and requires trust in the code. Mining is theoretically more decentralized (anyone can set up a miner), but in practice it is dominated by industrial farms. Staking is more accessible for the average user, but concentrates power in those with the most tokens.

For the investor, the practical difference is this: mining is a hardware and electricity business; staking is an investment decision with locked capital.

FAQ

Is staking safe?

The network can be secure and you can still lose money: through price drops, validator slashing or platform problems. Technical security is not the same as a guaranteed return.

How much can you earn staking?

It depends on the network and the moment. On Ethereum, low single digits annually; on smaller networks, more, with much more risk. No figure is guaranteed.

Can I withdraw my tokens whenever I want?

No. By staking you accept a lock-up period. On Ethereum, exiting can take days or weeks.

Do I need a minimum amount of tokens?

To validate directly on Ethereum you need 32 ETH, but pools let you participate with small amounts. Only stake money you do not need in the short term.

What is slashing?

A penalty for specific consensus violations, such as signing conflicting messages. It is distinct from ordinary inactivity penalties. It can cost you part of your locked capital even if you only contributed tokens.

Want to understand the ecosystem where staking lives? Read what Ethereum is and how smart contracts work, or how to choose a crypto wallet to store your tokens safely.

Further reading

• Bitcoin.org: how Bitcoin works
• Ethereum.org: documentation and concepts

Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.

Imagine borrowing money, earning interest or trading currencies without a bank in the middle. That is the promise of DeFi, decentralized finance: financial services built on blockchains, run by code instead of companies. It is one of the most important ideas in crypto — and one of the most misunderstood. Here is how it actually works.

What is DeFi

DeFi is the ecosystem of financial applications built on blockchain networks, mainly Ethereum. Instead of a bank holding your money and managing the rules, everything runs on smart contracts: programs that execute automatically and are visible to anyone.

The result is a financial system with no intermediaries: no branch, no approval process, no opening hours. Anyone with an internet connection can lend, borrow, trade or save, regardless of their country, credit history or income. That accessibility is the core of the idea.

The building blocks

• Stablecoins: cryptocurrencies designed to always be worth 1 dollar. They are the fuel of DeFi: a way to move value without the volatility of Bitcoin.
• Decentralized exchanges (DEX): platforms where you trade tokens directly against other users, without a company matching orders. You keep control of your funds until the trade executes.
• Lending protocols: you deposit crypto and earn interest, or deposit collateral and borrow against it. Interest rates are set by supply and demand, not by a bank.
• Yield farming: moving funds between protocols to earn rewards. It can be profitable, but it is also one of the riskiest activities in crypto.

How a DeFi loan works

A typical loan works like this: you deposit crypto as collateral, and the protocol lets you borrow stablecoins up to a percentage of that collateral (for example 75%). If the value of your collateral drops below the required level, the protocol automatically liquidates it to protect lenders.

There is no credit check: the collateral is the guarantee. That is the beauty and the trap — liquidation can happen in seconds during a crash, and many people have lost their collateral that way.

The benefits

• No permission: no bank account, no approval, no country restrictions.
• Transparency: every transaction and every rule is public. You can verify exactly how a protocol works.
• Speed and automation: loans, trades and interest are settled automatically, without paperwork.
• Global access: DeFi works the same in Barcelona as in Buenos Aires or Lagos.

The risks

• Smart contract bugs: the code can have flaws, and a flaw can mean losing real money. Audits help but do not guarantee safety.
• Hacks: billions of dollars have been stolen from DeFi protocols since the industry began. It is a young industry with a painful history.
• Liquidation risk: in lending, a sudden price drop can liquidate your collateral automatically.
• Volatility: the assets involved can swing violently, and yield that looks amazing can disappear overnight.
• Regulatory uncertainty: DeFi operates in a legal gray area in many countries, and rules are still being written.

Is DeFi for you?

DeFi is not a get-rich-quick scheme, and it is not for everyone. It makes sense if you understand blockchains, if you are comfortable with technical tools, and if you only risk money you can afford to lose. If you are a beginner, the sensible path is: learn how wallets and stablecoins work first, use small amounts, and never invest in a protocol you do not understand.

FAQ

Is DeFi legal?

It depends on the country. Using DeFi is not illegal in most places, but regulation is evolving and some activities (like unregistered lending) are being scrutinized. Check the rules in your country.

Do I need to verify my identity to use DeFi?

No. That is the point: no account, no KYC. You interact directly with the protocols using your wallet.

Can I lose more than I invest?

Generally no, but you can lose a large part of your deposit through liquidation, hacks or price crashes. Never borrow more than you can handle.

What is the difference between DeFi and traditional finance?

In traditional finance, a company or bank holds your money and sets the rules. In DeFi, code holds the money and the rules are public and automatic. Both have risks; they are just different kinds.

How do I start using DeFi?

With a wallet, some crypto and a regulated exchange to buy it. Then move small amounts to a trusted protocol and learn by doing — carefully.

Want the foundation first? Read what Ethereum is and how smart contracts work, or how to choose a crypto wallet.

A note on stablecoins

They aim to track a reference value but can lose their peg. Reserve, issuer, liquidity and contract risks remain; they are not equivalent to an insured bank deposit.

Further reading

• Bitcoin.org: how Bitcoin works
• Ethereum.org: documentation and concepts

Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.

Bitcoin proved that money can work without banks. Ethereum goes further: it proves that entire applications can run without a company behind them. Launched in 2015, it is the second largest cryptocurrency and, for many, the most important blockchain in existence. Understanding it is understanding where the crypto industry is actually heading.

What is Ethereum

Ethereum is a blockchain designed to run programs, not just transfer value. These programs are called smart contracts: code that executes automatically when certain conditions are met, without intermediaries and without anyone being able to stop it.

If Bitcoin is digital gold, Ethereum is a global computer. Anyone can upload a program to the network and anyone can use it, paying a small fee in ether (ETH), the network’s currency. That simple idea opened the door to an entire industry: decentralized finance, digital collectibles, markets, games and much more.

What are smart contracts

A smart contract is a program stored on the blockchain that runs exactly as written. It cannot be modified, censored or shut down by anyone. A simple example: a contract that holds money and releases it to the seller when the buyer confirms receipt. No lawyers, no bank, no waiting.

The name is misleading: they are not legal contracts. They are code with rules, and like any code they can contain bugs. That is why security audits matter so much in this industry: a flaw in a smart contract can mean losing real money.

What are dApps

dApp stands for decentralized application: an application whose backend runs on smart contracts instead of a private server. The user interface is a normal website, but the logic lives on the blockchain, where no one can delete it or change the rules.

The most common dApps today are decentralized exchanges (where you trade without an intermediary), lending protocols, prediction markets and games. All of them share the same promise: no company in control, rules visible to everyone.

What is DeFi

DeFi (decentralized finance) is the ecosystem of financial services built on Ethereum and similar networks: lending, borrowing, trading, savings and stablecoins without banks. You can lend your crypto and earn interest, or borrow against your holdings, all through smart contracts.

It is a real alternative for people without access to banking, but it is not free of risk: smart contract bugs, hacks and extreme volatility are part of the deal. You can read our full guide to DeFi for a deeper look.

The ether and Layer 2

Ether (ETH) is the fuel of the network. Every operation — sending money, executing a contract, minting a token — costs a fee paid in ETH, called gas. That gives ETH real utility: the more the network is used, the more ETH is consumed.

The catch is that Ethereum’s main network is expensive and slow when demand is high. That is why Layer 2 solutions exist: secondary networks that process transactions cheaply and then settle them on Ethereum. They are the reason fees have dropped dramatically in recent years.

Proof of stake

Since 2022, Ethereum does not use mining. It uses proof of stake: validators lock up ETH as a guarantee and earn rewards for confirming transactions. This reduced the network’s energy consumption by more than 99% and made participation accessible to regular users through staking.

FAQ

Is Ethereum a cryptocurrency?

Ethereum is a network; ether (ETH) is its cryptocurrency. In practice people say “Ethereum” when they mean the token, but the network and the currency are different things.

Is Ethereum better than Bitcoin?

They solve different problems. Bitcoin is digital money with a fixed supply; Ethereum is a programmable platform. Many investors hold both for different reasons.

What can I do with Ethereum?

Send value, use decentralized applications, lend and borrow, buy digital collectibles or simply hold ETH as an investment. The possibilities are the industry’s biggest strength and its biggest source of confusion.

Why are fees sometimes high?

Because the network has limited capacity and fees rise with demand. Layer 2 solutions exist precisely to make transactions cheap.

Can Ethereum be shut down?

No more than Bitcoin: it runs on thousands of computers around the world with no central point of failure.

Want to go deeper? Read what smart contracts really are, or how staking works if you want to earn rewards with your ETH.

Further reading

• Bitcoin.org: how Bitcoin works
• Ethereum.org: documentation and concepts

Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.