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Siacoin (SC) is a currency used for all transactions inside of the Sia network. Sia experienced impressive growth — more than 10,000x increase times from December 2015 to January 2018. There are three ways to get SC: Mining, buying Sia at a crypto exchange, selling (lending) your hard drive space, renting (virtual) space. Best crypto-storage solution: Sia UI wallet, Ledger Nano S or cold storage for long-term investment purposes.