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Ethereum RPC Client Library in .Net C#
@rsantirso - I guess the chain was started before Byzantium was made available? In any case, there should be a config in the genesis json file which you could include to start Byzantium.
This might help: https://ethereum.stackexchange.com/questions/29263/how-do-i-know-if-my-private-net-is-using-byzantium