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I was trying to add another network to my metamask and I accidentally deleted the Localhost 8545 network, was wondering if this could do any harm. Would anyone know what the settings of the Custom RPC would be to get it back?

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No harm, you can always add it back. This is just the standard local development url.

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  • The chain id value depends on the node that is running at your computer. For Ethereum mainnet it is 1. For other networks, like testnets, see here chainlist.org Jul 5 at 7:56
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No harm. You can start the RPC by executing admin.startRPC("127.0.0.1",8545) again if you need it.

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