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.
Black Teas: 212 o F (100 o C) In either case, the temperature of tea or coffee as served will be 10 o C or so less than the brewing temperature 55-92 degree celsius Note There is no maximum temperature set by Law.