The University of SydneyPage 21Mining Rewards–Mining reward cut in half every 4 years, precisely every 210,000 blocks–Started as 50 bitcoins per block in January 2009, currently 6.25 bitcoins per block.–Then, after the year 2140, when all bitcoins 20.99999998 million will have issued, no new bitcoins will be issued –Today, miners earn more from mining rewards, very little from transactions fees.–After 2140, miners will only receive transactions fees.–However, the primary purpose of the mining is not the reward or generation of new coins, but securing the bitcoin system