Ethereum Cancun Upgrade: An Overview

What Is the Cancun Upgrade?

Key Features and Goals

1. Proto-Danksharding (EIP-4844)

• Proto-danksharding is the centerpiece of the Cancun upgrade. It introduces “blobs,” which are large bundles of data that L2 rollups can attach to Ethereum blocks. These blobs allow massive amounts of data to be stored temporarily and much more cheaply than before, significantly reducing data posting fees for L2s, which in turn leads to cheaper transactions for users2734+2.
• Proto-danksharding paves the way for full danksharding, a future sharding solution that aims to further boost network throughput and scalability235.

2. Enhancing Layer-2 Rollups

• Cancun is designed to make L2s such as Arbitrum and Optimism more efficient by lowering their operating costs, thereby improving the user experience with lower gas fees and faster transaction finality76.

3. EIP Highlights

4. Network Security and Usability

• In combination with Deneb, Cancun includes improvements to validator management, security, and smart contract functionality (notably changes to the SELFDESTRUCT opcode)248.

Why Is the Cancun Upgrade Important?

• Scalability: Sets the foundation for Ethereum’s long-term scaling by enabling cost-efficient and scalable usage of L2 rollups.
• Cost Reduction: Directly reduces L2 transaction fees, making the network more attractive for DeFi, NFT, and dApp users.
• Future-Readiness: Establishes the core infrastructure for further upgrades like full danksharding, with the goal to eventually process up to 100,000 transactions per second1235.
• Enhanced Staking Experience: With Deneb, increases flexibility and security for stakers and validators4.

Timeline and Impact