Choose your Chain ID
Choose Chain ID for your L2
Choose a Chain ID that uniquely identifies your chain. It will be used to set up MetaMask later.
98989897
Check that the Chain ID it not taken already using https://chainlist.org/?testnets=true.
MetaMask uses ChainList to suggest chain details such as name and currency, and will complain if you use an existing Chain ID. So make sure to choose a new unique Chain ID.
If you will deploy your chain for public use, then add your chain to ChainList as well.
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