---
title: Differences between Ethereum and Base
slug: /differences
description: Documentation covering the differences between Ethereum and Base. This page includes details on differences between opcodes, blocks, network specifications, and transaction costs.
keywords:
  [
    Ethereum vs Base,
    Base differences,
    difference between Base and Ethereum,
    Bedrock,
    OP Stack,
    Base opcodes,
    Base blocks,
    Base network specifications,
    network specifications,
    Base transaction costs,
    transaction costs,
  ]
hide_table_of_contents: true
---

# Differences between Ethereum and Base

Base is built on the [Bedrock](https://stack.optimism.io/docs/releases/bedrock/explainer/) release of the [OP Stack](https://stack.optimism.io/), which is designed from the ground up to be as close to Ethereum as possible. Because of this, there are very few differences when it comes to building on Base and Ethereum.

However, there are still some minor discrepancies between the behavior of Base and Ethereum that you should be aware of when building apps on top of Base.

These minor differences include:

- [Opcodes](https://stack.optimism.io/docs/releases/bedrock/differences/#opcode-differences)
- [Blocks](https://stack.optimism.io/docs/releases/bedrock/differences/#blocks)
- [Network specifications](https://stack.optimism.io/docs/releases/bedrock/differences/#network-specifications)
- [Transaction costs](https://stack.optimism.io/docs/releases/bedrock/differences/#transaction-costs)