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27 October 2020

Ethereum's Top Dapps Are Increasingly Turning to 'Rollups' - CoinDesk

Ethereum's Top Dapps Are Increasingly Turning to 'Rollups' - CoinDesk


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Entirely different from the fruit variety, a rollup is an off-chain aggregation of transactions inside an Ethereum smart contract.

Ethereum users can transact inside the contract with security guarantees their transactions won’t be misused and they will settle to the mainchain at some future point.

The method of guaranteeing transactions is where rollup constructions diverge: One on side are Zero knowledge proof rollups (ZKR), relying on math; on the other are Optimistic rollups (OR), relying on financial incentives.

Layer 2 (L2) solutions like ZKR and OVR require additional hardware setups because the proof to settle rollup transactions on-chain often requires additional hardware support to get the job done.

In plain language, that means the bundle of transactions included in a rollup needs to be verified in some sort of way. .

ZKRs bundle a group of transactions, compress them and slap on a zero-knowledge proof to certify the state transitions validity, as Buterin describes in a 2019 blog post.

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