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you can start earning/mining grid coin by downloading boinc from https://boinc.berkeley.edu , then sign up to grc pool https://www.grcpool.com and configure your boinc client with your GRC account and then add a project ,you can install this client on multiple devices . this will get you started , you can also gain free gridcoins from this site here https://gridcoinstats.eu/faucet.php .

grid coin can also be purchased from https://bittrex.com/Market/?MarketName=BTC-GRC

you will also need a gridcoin wallet which you can get here https://www.gridcoin.us