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For example, if a developer wants to build a DApp on Ethereum, they would use these methods to get information about the network they are connecting to. They could use the chain ID information to make sure they are connecting to the right network and to ensure the security of their DApp; for example, distinguishing between the main network and a test network.

Retrieving chain information from the Ethereum blockchain can be done by using the following methods:

eth_chainId

eth_syncing