After barter, it is believed that the first money was cowrie shells. In fact, their mining is real bitcoin mining, at first, you find shells near the coast, and when they start to run out, you have to look for them far from the coast, at great depths, spending more energy and effort, or, wait for a storm and get them on the beach, almost for free, how to buy bitcoin on the market without resorting to mining in the days of its fall).

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