Riot Platforms (NASDAQ:RIOT) recently said that it has a more than 9% stake in rival Bitcoin (BTC-USD) miner Bitfarms (NASDAQ:BITF) and wants to buy the firm. The miner has made a $950 million offer to buy Bitfarms after a private approach was rejected.RIOT stock is falling slightly on the news while BITF stock is on the rise. Shares of Riot Platforms opened today at $10.24 per share and a market capitalization of about $3 billion. Meanwhile, BITF opened at $2.23 per share and a market cap roughly $845 mill ...