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ZK Rollup

A rollup that submits a cryptographic validity proof with every batch of transactions instead of relying on a fraud-proof challenge window.

FBFenwei BianAuthorVZVictor ZhouEditorJuly 2, 2026
  • glossary

A ZK rollup (also called a Zero-Knowledge Rollup or Validity Rollup) is a type of rollup that submits a cryptographic validity proof alongside every batch of transactions rather than assuming validity by default. Because the base chain verifies that proof on-chain, "there are no delays when moving funds from a ZK-rollup to Ethereum... because exit transactions are executed once the ZK-rollup contract verifies the validity proof"—unlike an optimistic rollup, which needs a multi-day fraud-proof challenge window before a withdrawal is final. ZK rollups bundle thousands of transactions per batch and post only minimal summary data to Ethereum, using proof systems such as zk-SNARKs or zk-STARKs. zkSync Era, Starknet, and Linea are prominent ZK rollups. The trade-off is computational: generating validity proofs is expensive, and full compatibility with Ethereum's virtual machine is technically harder to build than a fraud-proof system. For tokenized domains, a ZK rollup gives the fastest path to layer-1-final ownership transfers of any rollup design.

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Contributors

Fenwei Bian

Software Developer & Writer • Namefi
Author

Fenwei Bian is a software developer in her thirties who spends her working hours in pull requests and her weekends with her hands in soil or sawdust. Years of open source on GitHub taught her that names are interfaces: a good one is clear, honest about what it does, and kind to whoever has to use it next.

She gardens because it rewards patience and punishes wishful thinking, and she does woodwork because a joint either fits or it doesn't. Both habits show up in how she writes about naming — measure twice, check the source, and don't sand over a rough spot and hope no one notices.

For Namefi she writes about how domain markets actually move, the practical trade-offs of tokenizing and flipping names, and picking a domain you'll still be glad you own in twenty years.

GitHub

Victor Zhou

Founder & Standards Editor • Namefi
Editor

Victor Zhou is a technology founder and standards editor focused on digital identity and trust. He founded Namefi, edits Ethereum Improvement Proposals, and previously led smart-contract architecture work at Google Labs.

His work sits at the intersection of naming, ownership, and the systems people use to establish identity online. That perspective makes him especially interested in the way names move between personal meaning, public recognition, and digital infrastructure.

For Namefi, Victor edits and writes about domains as durable digital identity: how names become ownable onchain assets, how tokenization changes custody and trust, and what naming can learn from the systems people use to establish identity online.

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