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Ropsten

Ropsten is one of the first test networks that use PoW consensus methods for generating blocks. It was earlier known as Morden. As mentioned before, it is completely free of cost for usage and it can be used during the building and testing of smart contracts. It can be used by using the --testnet option available in Geth. Geth will be explained in detail in the next section. This is by far the most popular test network.

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