Mining. In cryptocurrency networks, mining is a validation of transactions. For this effort, successful miners obtain new cryptocurrency as a reward. The reward decreases transaction fees by creating a complementary incentive to contribute to the processing power of the network.
It matters because the actual coffee flavor is extracted from grind better at higher temperatures. I'm not a scientist but I trust those that have done the research and they say that the optimal temperature for hot water in a coffee pot is between 195-200 degrees or just a little under boiling.
The ideal temperature for brewing coffee is 200 Degrees Fahrenheit. That said, don't get overly concerned about hitting the exact right temperature. Drip brewers have their own thermostats, and some even offer you a choice of more than one brewing temperature.