The only question is: how to ensure that the state of the layer2 block in multi-chain contract is synchronized? Due to the maintenance of the same layer2 state in the multi-chain contract, l1 will have a different confirmation time. Zecrey will ensure that Ethereum is the most stable chain in maintaining the state of layer2, which means that Ethereum is the fastest chain updating zecrey layer2 states. The Relayer network will synchronize other chains after the layer-2 block of the Ethereum contract is updated. For example, if Ethereum synchronizes to 100 blocks of layer2, the Relayer network will synchronize other chains to 100 blocks at most, although their confirmation time may be shorter.