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Rollup
A rollup is a layer 2 network that executes transactions away from a base chain such as Ethereum, then posts the transaction data back to it in batches. Because the data lands on the base chain, a rollup draws its security from that chain rather than from its own validators.
What it means for you. Sharing one base-chain posting among many users is what makes rollup fees lower. Withdrawing to the base chain is not always instant: on an optimistic rollup the funds wait through a challenge period of roughly seven days, unless a third party pays them out early for a fee.
Sources: ethereum.org: Scaling, ethereum.org: Optimistic rollups, ethereum.org: Sidechains · checked 4 October 2026
Sidechain
A sidechain is a separate blockchain that runs alongside a main chain such as Ethereum, with its own validators and consensus rules, and is linked to it by a two-way bridge. Unlike a rollup, it does not post its transaction data back to the main chain.
What it means for you. A sidechain's security comes from its own validators, not from Ethereum, so if they act dishonestly Ethereum cannot correct it. Tokens moved there through the bridge are usually burned on one side and minted on the other, so their value depends on that bridge and its contracts working as intended.
Source: ethereum.org: Sidechains · checked 4 October 2026