Ethereum is an open-source, decentralized smart contract platform with ETH as its native token. Proposed by Vitalik Buterin and others, it launched its mainnet in 2015. Unlike Bitcoin, which primarily focuses on value transfer, Ethereum functions more like a programmable computer maintained by global nodes: developers can write rules into contracts, allowing programs to execute automatically on-chain.
What is Ethereum?
- Smart Contract Platform: Ethereum allows developers to deploy decentralized applications (DApps) whose logic is executed by on-chain contracts rather than controlled by a single intermediary.
- Public Settlement Layer: ETH is used to pay for on-chain operation fees and can also be staked to participate in network consensus; an ecosystem of wallets, explorers, developer tools, and infrastructure has formed around it.
- Application Ecosystem: Applications such as DeFi, NFTs, DAOs, stablecoins, and real-world assets (RWAs) are frequently built on Ethereum or its Layer 2 networks.
It is often referred to as the "world computer," but a more accurate understanding is that Ethereum provides a set of public execution environments allowing different applications to share the same set of accounts, contracts, and state rules.
How does Ethereum work?
- Account-Initiated Transactions: Ethereum has two types of accounts—one controlled by private keys and the other by contract code. Users or contracts can initiate transactions such as transfers, contract calls, and data submissions.
- Transaction Broadcast and Packaging: Once broadcasted to the network, transactions are included by nodes into candidate blocks, where they are ordered, verified, and executed according to rules.
- Contract Execution via the Ethereum Virtual Machine: Nodes run contract code through the Ethereum Virtual Machine (EVM), updating balances, contract states, and event logs. All nodes must reach a consensus on the result of the same transaction for the chain's state to advance.
- Proof-of-Stake Consensus Maintenance: Following the completion of the "Merge" in September 2022, Ethereum transitioned from Proof-of-Work to Proof-of-Stake. Validators stake ETH to participate in block proposal, attestation, and confirmation; complying with the protocol yields rewards, while dereliction of duty or malicious behavior can lead to slashing.
- Layer 2 Scaling: Layer 2 solutions such as Rollups handle partial transaction execution or data aggregation off-chain before submitting necessary information to the mainnet for settlement. The mainnet undertakes security and final confirmation roles, while Layer 2 networks lower gas fees and enhance throughput.
ETH, Gas, and Transaction Fees
Executing operations on Ethereum consumes Gas, with Gas fees typically denominated in ETH. Gas limits the amount of computational work a user is willing to pay for in a transaction, and fee levels depend on network congestion, contract complexity, and transaction data size. EIP-1559 introduced a fee burn mechanism that destroys a portion of fees when the network is active; however, this does not equate to steady deflation, nor does it constitute a price prediction.
What are the differences between Ethereum and Bitcoin?
Bitcoin primarily emphasizes value transfer and network security, with relatively restrained scripting capabilities; Ethereum centers on programmable contracts, aiming to support a wider array of decentralized applications. Simply put, Bitcoin is more like a value settlement network, whereas Ethereum functions more like a public computer geared toward application development.
Risks to Watch For
- Smart contracts may contain vulnerabilities; users should verify contract sources and audits prior to interaction.
- Gas fees fluctuate with network activity levels, which can impact the transaction experience.
- Layer 2 networks rely on mainnet security, data availability, and their respective proving mechanisms, meaning different solutions carry varying risk structures.
- Once wallet private keys are compromised, on-chain assets may be unrecoverable; application platforms and regulatory rules are also subject to change.
