Nodes, L1/L2, Rollups

L2 Rollups: Optimistic and ZK, Data Availability Intermediate Infrastructure • ~15–18 min read • Updated: 08/08/2025 TL;DR: Rollups execute off the base layer and post summaries back: Optimistic rollups rely on fraud proofs during a challenge window; ZK rollups post validity proofs the base layer can verify quickly. Security depends on where data lives: L1 […]