# What is an Ethereum transaction and how does it work?

Jessica Washington · August 4, 2026

> An Ethereum transaction is initiated when a user sends an instruction from an externally owned account (EOA) to the Ethereum network, which is made up...

An Ethereum transaction is initiated when a user sends an instruction from an externally owned account (EOA) to the Ethereum network, which is made up of nodes that maintain and update the blockchain.

Each Ethereum transaction must be cryptographically signed with the sender's private key to ensure authenticity and prevent fraud, leveraging the principles of public-key cryptography commonly used in security protocols.

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Transactions are not only limited to sending Ether (ETH), but can also involve the execution of smart contracts, which are self-executing contracts with the terms directly written into code.

The Ethereum blockchain works on a decentralized ledger technology, meaning all transactions are recorded in blocks that are linked together in chronological order, and each change is visible to everyone on the network.

Ethereum uses a gas system to measure the computational effort required for executing transactions and smart contracts; users must pay gas fees in gwei (nano-Ether) to incentivize miners to include their transactions in a block.

Since the introduction of EIP-1559, Ethereum's transaction model has changed to include a base fee that is burned with each transaction, reducing the supply of ETH and potentially creating deflationary pressure.

The base fee for transactions adjusts dynamically based on network demand; during high demand periods, fees increase, while during low demand, they decrease, which helps to optimize network congestion.

Gas limits can be set by the sender to specify the maximum amount of gas they are willing to pay for the transaction; if the gas limit is exceeded, the transaction fails, but the gas used until the failure is still charged.

The Ethereum network operates on a consensus mechanism called Proof of Stake (PoS), which was fully transitioned to with Ethereum 2.0, enabling validators to replace miners in confirming transactions and improving efficiency.

Block times on Ethereum average about 12-15 seconds, allowing transactions to be confirmed relatively quickly compared to Bitcoin, which typically has a 10-minute block time.

When users check the status of their transaction on a blockchain explorer like Etherscan, they can see details including transaction hash, sender and receiver addresses, gas used, and the transaction's block number and timestamp.

The term "nonce" in the context of Ethereum transactions refers to the number of transactions sent from a particular address, ensuring that the same transaction cannot be submitted multiple times for added security.

Smart contracts are deployed on Ethereum’s blockchain through transactions, and they can automatically execute actions when predetermined conditions are met, demonstrating the flexibility of blockchain technology beyond simple currency transfers.

The fees paid during a transaction do not go to the Ethereum network itself; rather, they are distributed as rewards to validators or miners who successfully process and validate the transactions.

An important layer of Ethereum's architecture is the Ethereum Virtual Machine (EVM), which allows anyone to execute code and interact with the Ethereum network in a decentralized manner, making it a key player in the rise of decentralized applications (dApps).

The transaction pool, or "mempool," is where pending transactions reside before they are mined and included in a block, allowing miners to prioritize transactions based on gas fees and other factors.

Ethereum transactions can be subject to long confirmations during periods of network congestion, which has driven innovations such as Layer 2 scaling solutions like Optimistic Rollups and zk-Rollups that aim to reduce congestion on the main chain.

Security in Ethereum transactions not only relies on cryptographic algorithms but also on the principles of game theory, as validators are economically incentivized to behave honestly due to the potential loss of their staked assets.

As of late 2024, ongoing improvements in Ethereum's infrastructure include sharding, which is expected to enhance scalability by dividing the network into smaller, manageable pieces that can process transactions simultaneously.

Understanding the technical details of Ethereum transactions requires familiarity with multiple domains, including computer science, cryptography, network theory, and economics, reflecting the interdisciplinary nature of blockchain technology.

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