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Creating a local ethereum testing network

To develop a smart contract on the ethereum blockchain we need a local environment to work in. Obviously we don't want to test on the main network where we take on actual financial costs and risks so instead we need to setup a test network. We could use one of the public test networks but this takes a lot of time and memory to sync with. Instead it will often be sufficient to create a personal, private test network with multiple accounts to interact with. This post shows how such a network can be created locally using geth.

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