If Bitcoin can be described as digital gold, Ethereum is much harder to sum up in a single sentence. It is not simply a currency, but an entire technological platform capable of running programs, contracts, and applications in a decentralized manner. From finance to digital art, video games, and governance, Ethereum has opened a completely new door to an internet without intermediaries.
These days, when we talk about the crypto ecosystem, Bitcoin and Ethereum are the two names that always come up first. They share the fact that both are decentralized and use blockchain technology, but their goals are very different. While Bitcoin was created to be digital money, Ethereum was created to be something much more ambitious: a global computer with no owner.
Next, we’ll take an in-depth look at what Ethereum is, how it works, what makes it special, and why it has become the world’s second-largest cryptocurrency.
What is Ethereum?
Ethereum is an open-source, decentralized blockchain platform that allows users to create and run applications and smart contracts without the need for intermediaries. Its native cryptocurrency is called Ether (ETH), and it is used to pay for transactions within the network.
Unlike Bitcoin, whose primary purpose is to serve as a store of value and a medium of exchange, Ethereum was designed from the outset as a programmable platform. This means that any developer in the world can build their own decentralized applications on Ethereum, known as dApps (decentralized applications), without asking anyone for permission and without relying on centralized servers.
Here’s an easy way to think about it: if Bitcoin is like email for money (simple, straightforward, and effective), Ethereum is like a full-fledged operating system where you can install all kinds of programs.
The Origins of Ethereum
The story of Ethereum begins with a young programmer named Vitalik Buterin, born in Russia and raised in Canada. Buterin was passionate about Bitcoin from a very young age and was an active contributor to its community. However, over time he came to a clear conclusion: Bitcoin had a major limitation. It was very good at doing one thing—transferring value—but its programming language was too restrictive to build more complex applications.
In November 2013, Buterin posted the Ethereum white paper, where he presented his vision of a blockchain with a full-fledged programming language (known in computer science as «Turing-complete»), capable of running any type of program. The proposal made a huge impact on the crypto community.
In July and August 2014, the project conducted an ICO (initial coin offering) to raise funds, raising over $18 million. Finally, the July 30, 2015, the Ethereum network was officially launched with its first version, called Frontier.
Since then, Ethereum has undergone numerous major updates, the most significant of which The Merge In September 2022, a technological milestone that completely transformed the network’s validation system and reduced its energy consumption by more than 99.1%.
Did you know? Vitalik Buterin was only 19 years old when he published the Ethereum white paper. He is one of the youngest founders of a globally significant technology infrastructure.
What are smart contracts?
The most important concept for understanding Ethereum is that of smart contract (smart contract). These are programs that execute automatically on the blockchain when certain conditions are met, without the need for any person or institution to intervene.
Imagine a traditional contract between two parties. Typically, you need a notary, a lawyer, or some trusted institution to ensure that both parties will honor the agreement. A smart contract eliminates that intermediary: The code itself ensures compliance.
Here’s a simple example: suppose you want to bet a friend on whether it will rain tomorrow. With a smart contract, you both deposit your money on the blockchain; the contract automatically checks the weather data, and at the end of the day, it transfers the money to the winner without anyone having to intervene.
The main features of smart contracts are:
- Immutability: Once deployed on the blockchain, they cannot be modified.
- Transparency: Its code is public and can be verified by anyone.
- Automation: They run automatically when the conditions are met, without human intervention.
- No middlemen: They eliminate the need for banks, notaries, lawyers, or centralized platforms.
This technology has given rise to entire sectors within the crypto ecosystem, such as DeFi (decentralized finance) or the NFT (non-fungible tokens).
How does the Ethereum blockchain work?
Like Bitcoin, Ethereum uses a blockchain to record all transactions and operations on the network. However, the Ethereum blockchain is much more versatile, as it stores not only transfers of value but also the status of all smart contracts currently running.
We can think of the Ethereum blockchain as a massive distributed state machine. Each block records not only who sent ETH to whom, but also which instructions each smart contract executed and the current state of all the programs running on the network.
The Ethereum Virtual Machine (EVM)
The technical heart of Ethereum is the EVM (Ethereum Virtual Machine), a type of virtual computer that runs identically on all nodes in the network. When a developer deploys a smart contract, they do so in a language called Solidity, which is then compiled into instructions that the EVM can interpret.
EVM ensures that the same contract, executed on thousands of different computers around the world, always produces exactly the same result. This distributed consensus is what makes Ethereum reliable without the need for a central authority.
Gas: The Fuel of the Grid
Every transaction performed on Ethereum has a cost measured in units called gas. Gas is the mechanism that determines how many computational resources each transaction or contract consumes. The more complex the operation, the more gas it requires.
Users pay for gas in ETH. This system has two key functions: first, compensate validators that process transactions; on the other hand, prevent spam, since executing transactions comes at a real cost. The so-called «gas fees» are one of the most common topics of discussion in the Ethereum community, especially during periods of high network congestion.
Important note: Gas fees on Ethereum can be very high when the network is congested. That is why Layer 2 solutions have emerged, such as Arbitrum, Optimism o Polygon, which enable cheaper and faster transactions while leveraging Ethereum's security.
From Proof of Work to Proof of Stake: The Merge
One of the most significant changes in Ethereum's history was the transition of its consensus mechanism. In its early years, Ethereum used the same system as Bitcoin: the Proof of Work (PoW) or proof-of-work, which required miners to solve complex mathematical problems using a huge amount of energy.
The September 15, 2022, Ethereum completed The Merge, one of the most complex technological upgrades ever implemented on a live blockchain. With this upgrade, the network switched to using the Proof of Stake (PoS) or proof of participation.
How does Proof of Stake work?
Instead of miners competing with computing power, PoS uses validators who stake a certain amount of ETH as collateral to participate in transaction validation. The more ETH they stake, the greater their chances of being selected to propose the next block.
If a validator acts dishonestly, they lose part of their locked ETH (which is known as slashing). This creates a financial incentive to behave appropriately.
The consequences of The Merge were significant: Ethereum's energy consumption fell by more than one 99,95%, making the network one of the most energy-efficient blockchains among the leading ones.
Did you know? To become a validator on Ethereum, you need 32 ETH locked up as collateral. However, there are collective staking services that allow users to participate with much smaller amounts.
The Ethereum Ecosystem: DeFi, NFTs, and dApps
Ethereum is not just a cryptocurrency. It is a platform upon which an entire financial and technological ecosystem has been built. These are its main pillars:
DeFi: Decentralized Finance
The DeFi These are financial applications built on the Ethereum blockchain that replicate traditional banking services—loans, exchanges, savings, insurance—but without banks or intermediaries. Anyone with an Ethereum wallet can access them.
Projects such as Uniswap (decentralized exchange), Aave (decentralized lending) or MakerDAO (decentralized stablecoins) currently manage billions of dollars in assets without being controlled by any company or bank.
NFT: Non-Fungible Tokens
The NFT They are unique, one-of-a-kind digital certificates stored on the blockchain. Although the general public first became familiar with them mainly through digital art, their utility extends far beyond that: they can represent ownership of any digital or physical asset, from music to real estate.
Most of the most prominent NFTs were created and are traded on the Ethereum blockchain, using the token standard ERC-721.
dApps and DAOs
The dApps are decentralized applications that run on smart contracts. From video games to social media, marketplaces, and productivity tools. The DAO (Decentralized Autonomous Organizations) are communities governed by smart contracts where decisions are made through voting by token holders, without the need for traditional executive leadership.
Features of Ether (ETH)
Ether (ETH) It is the native asset of the Ethereum network and has several uses within the ecosystem:
- Gas bill: It is the currency used to pay for all transactions and operations within the Ethereum network.
- Staking: You can stake ETH to become a validator and earn rewards.
- Store of value: Many investors view it as a long-term investment, comparable in significance to Bitcoin but with a different risk profile.
- Collateral in DeFi: It is used as collateral in numerous decentralized finance protocols.
Unlike Bitcoin, Ethereum does not have a fixed upper limit on the number of coins that can be issued, although since the update EIP-1559 In 2021, a portion of the ETH paid in fees is destroyed (or «burned»), which, during periods of high activity, can cause the net supply of ETH to decrease, adding deflationary pressure to the asset.
Ethereum Today: The Future of the Decentralized Web
Ethereum remains the world's most widely used smart contract platform. Despite competition from other blockchains such as Solana, Avalanche, and BNB Chain, it maintains its leading position thanks to its security, its developer community, and the vast amount of capital and applications already built on it.
The Ethereum Roadmap envisages numerous improvements in the coming years, aimed at increasing scalability, reducing costs, and enhancing the user experience. Concepts such as the sharding (splitting the blockchain into shards to process more transactions in parallel) or improvements to layer-2 solutions are part of the platform's technological roadmap.
Ethereum is also one of the assets with the strongest institutional presence, with investment funds, technology companies, and financial institutions that have included ETH in their portfolios or built services on its network.
Would you like to learn more about the origins of cryptocurrencies? Read our article on Bitcoin, where we explain what it is, how it works, and why it forms the foundation of the entire crypto ecosystem.