Orca Crypto
Technology term

Rollup

A layer 2 that bundles many transactions into one settlement on the base chain.

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Updated 2026-08-303 min readDefinition
Definition

A layer 2 that bundles many transactions into one settlement on the base chain.

A rollup executes transactions off chain and posts compressed data plus a proof or a challenge window back to layer 1. Thousands of transactions share the cost of a single posting.

Two families exist. Optimistic rollups assume validity and allow challenges. ZK rollups prove validity mathematically before settling.

In practice

Rollup fees dropped sharply once Ethereum added a cheaper data lane specifically for them.

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