The nature of rollups
There are two ways to expand the blockchain: one is to optimize the blockchain itself, and the other is to use the blockchain in a better way.
Rollup is the second type. Its real essence is very simple. It is faster, cheaper and "credible" to use the blockchain to expand the blockchain (basically referring to Ethereum). Rollup will calculate (and state storage) Move off-chain, but keep some data for each transaction on-chain. To improve efficiency, they use a bunch of fancy compression tricks to replace data with computation whenever possible.
Rollup is: smart contract on the chain + aggregator off the chain. It’s that simple. The combination of these two features defines Rollup and enriches its concept. Smart contracts on the chain indicate that its trust model is Ethereum A smart contract on the square, borrowing the security of Ethereum, instead of needing to establish a new trust consensus like Alt L1. We can trust Arbitrum's protocol like trusting Uniswap's protocol (the core is a smart contract). Off-chain aggregation It means that it will execute and aggregate transactions under the chain, compress large-scale data exchange, and finally put it on the Ethereum main network to achieve faster and more concise goals.
On top of that, the lack of data availability issues means that mapping data to owners is no longer necessary, which is the key reason why the Ethereum community is more enthusiastic about rollups than previous forms of Layer 2 scaling: rollups are fully general, It is even possible to run the EVM in a rollup, allowing existing Ethereum applications to migrate to Rollup with almost no new code to write.
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