Rollup
Scaling solution that executes transactions off-chain and posts proofs on-chain
What is Rollup?
A Layer 2 scaling technique that bundles (rolls up) hundreds of transactions off-chain, then posts a single cryptographic proof back to the main chain. Rollups inherit the security of the base layer while dramatically increasing throughput and reducing fees. The two main flavors, optimistic and zero-knowledge, differ in how they prove correctness. Rollups are the consensus answer to 'blockchains are too slow and expensive.'
How it works
Key takeaways
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Batches transactions off-chain for speed
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Posts proof back to Layer 1 for security
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Reduces fees while inheriting L1 trust
Real-world example
Arbitrum processes thousands of transactions off-chain, then posts a single proof to Ethereum. Users get Ethereum security at 10x lower fees.
