Create a mainnet and other ready-made blockchain information classes

[atoulme]

SimpleBlockchainInformation allows to create information about the eth subprotocol to other clients.

Use a fixed set for mainnet, goerli, rinkeby and ropsten.

[ogkunald]

Hello,I would like to work on this, can you assign this to me and can you explain where the classes needs to be added

[atoulme]

Sure thing. I think you need to look at SimpleBlockchainInformation first - see how some of the information there like chain id, genesis hash, network ID are fixed per network? Create a map of "network name" to this information, so it becomes easier to read this from config.

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