The US, Russia and China together control over 65% of global Bitcoin hashrate, a reminder that mining power remains heavily concentrated even as local shocks push smaller markets up and down. Related Reading: Bitcoin Mood Sours To Levels Not Seen Since Late February In that mix, Iran has seen a sharp fall. Its hashrate dropped about 77% in the past quarter, to roughly 2 EH/s, after months of conflict and disruption. Iran’s Share Drops Fast According to a report from Hashrate Index, Iran lost about 7 EH/s quarter over quarter