Bitmine (BMNR), the largest Ethereum treasury firm, bought just 7,430 ether (ETH) last week, dialing back its buying spree as it redirected capital to a stock buyback. The latest purchase, worth about $14 million at ether’s current price of $1,879, lifted BitMine’s holdings to 5,78 million ETH, or roughly 4.8% of Ethereum’s circulating supply, according…