Rollup
A Layer-2 technique that executes transactions off-chain and posts compressed proofs or data to the base chain.
Rollups batch transactions outside the base chain and publish enough data, commitments, or proofs for the base chain to settle the result. Optimistic rollups rely on fraud proofs and challenge windows; zk-rollups rely on validity proofs.
Rollups can reduce fees and increase throughput, but they add bridge risk, sequencer assumptions, data availability requirements, and different withdrawal rules. Their security depends on implementation details, not just the word "rollup."
Related terms
4 linkedExplore connected entries beyond the alphabetical index.
Layer-2
→A protocol built around a Layer-1 to move activity off the base chain while relying on it for settlement or security.
On-chain
→On-chain activity is recorded directly in blockchain transactions and becomes part of the confirmed ledger.
Off-chain
→Activity that occurs outside the base blockchain, often for speed, privacy, or cost efficiency.
Ethereum Virtual Machine (EVM)
→The EVM is the deterministic runtime that executes smart contract bytecode on Ethereum and EVM-compatible networks.
All terms and definitions may update as the Cryptionary improves.
