ZK Rollups Scaling

Zero-knowledge rollups are Layer 2 blockchain scaling solutions that bundle hundreds or thousands of transactions into a single cryptographic proof. Instead of validating every transaction on the main blockchain (expensive and slow), a ZK rollup validates all transactions off-chain, generates a zero-knowledge proof that all transactions are valid, and submits only the proof to Layer 1. This reduces per-transaction cost by 100–1000x and enables 1000+ TPS (transactions per second) vs. Ethereum's 12 TPS. Implementing ZK rollups requires designing transaction validity circuits, integrating with existing blockchains, building a sequencer (which orders transactions and generates proofs), and deploying verifier smart contracts on Layer 1. Projects like Polygon zkEVM, StarkNet, and Scroll are production ZK rollups.