Why do contracts deployed on L1 need rollup?

matter-labs / v2-testnet-contracts

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Closed LuozhuZhang closed 2 years ago

LuozhuZhang commented 2 years ago

I saw the source code from IZkSync.sol and IExecutor.sol, get a small question

Why deploy contract on Layer1 need Rollup related code? What role does rollup play?