Rollups

Rollups are Layer 2 scaling solutions that execute transactions off-chain and submit a single bundled proof to the Layer 1 blockchain, compressing hundreds or thousands of transactions into one on-chain commitment. Optimistic rollups assume transactions are valid by default and only compute proofs if challenged, while zero-knowledge rollups cryptographically prove every transaction's validity before settlement. Rollups inherit Layer 1 security while reducing transaction costs and increasing throughput by orders of magnitude, making them the most promising near-term scaling solution for Ethereum and other blockchains. Example: Optimism, an optimistic rollup launched on Ethereum in 2021, processes transactions with seven-day fraud-proof windows, enabling users to transact for pennies while maintaining full Ethereum security and EVM compatibility for existing dApps. Why it matters for Layer 2 scaling: Rollups represent the most viable path to blockchain scalability without sacrificing security or decentralization. They enable Layer 1 blockchains to scale to mainstream adoption levels while keeping user funds protected by Layer 1 security, making them critical infrastructure for Web3 growth.

Category: layer2 solutions

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