zkSync, the Ethereum second-tier network based on ZK Rollup, tweeted that zkSync has invested at least $3.5 million in audits, bug bounties and competitions, but considering that there is no absolute security, other security measures will be taken after zkSync 2.0 is released. Including: restricting the flow of early funds, ensuring that developers have enough ETH for contract deployment and testing transactions, minimizing the risk of the system losing a large amount of value in the early stage; taking "speed bump" measures to limit withdrawals to daily TVL 10%, limit the consequences of any security breach; use OpenZeppelin to automatically monitor early warnings to deal with critical situations, etc.