Ethereum's Major Upgrade 'Dencun' Outline and Effects

Sun, 19 Apr 2026 14:55:00 +0900

Ethereum’s “Dencun” hard fork upgrade is a major milestone in the network’s scaling roadmap. Introducing Proto-Danksharding, it targets Ethereum’s high gas fees. We explain the mechanics and impact of this upgrade.

The Core Feature: EIP-4844

Dencun’s central improvement is EIP-4844 (Proto-Danksharding).

The “Blob” Data Space: Previously, Layer 2 networks posted data into Ethereum’s expensive call data storage. EIP-4844 creates temporary data packages called “Blobs” that expire after a few weeks, drastically reducing mainnet data verification costs.

Layer 2 Fees Plummet 90%+

With Blobs active, transaction costs on L2 networks (like Arbitrum, Optimism, and Base) plummeted by over 90%. Users can interact with smart contracts for fractions of a cent, eliminating a major user-experience barrier for dApps.

Dencun on Mainnet.jp

Ethereum's Major Upgrade 'Dencun' Outline and Effects

The Core Feature: EIP-4844

Layer 2 Fees Plummet 90%+