A key measure of competition among Bitcoin miners just dropped by 15.95 percent – the second-largest decline in the network's history. The drop in so-called mining difficulty signals some miners have bowed out of the ongoing race to solve math problems to win freshly minted bitcoin, as a decline in the cryptocurrency's price has made this activity less profitable. That said, the drop could work in favor for those who have chosen to stay in the game as less competition means individual miners would gain a bigger cut in Bitcoin's daily mining output. The world's largest blockchain network by market capitalization ... (full story)