I recommend upgrading your contract once every week

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I recommend upgrading your contract once every week. Right now I earn about $10 BTC per day ($300 per month), so I can upgrade my bitcoin mining contract with $30 weekly to increase my daily payment, and have $180 profit. Some customers start with a large purchase of hash power to receive large daily payments they can re-invest frequently. Genesis Mining does all the work, and I get paid daily.

Genesis Mining farm located in Iceland