Source: Highlights A Musk tweet on Wednesday that Tesla would no longer accept payments in bitcoin sent the cryptocurrency tumbling 17%, roiling bitcoin futures and dragging down the broader cryptocurrency market. The upstart cryptocurrency received a further bump on Thursday when Musk said he was involved in work to improve its transaction efficiency. Musk`s tweets about dogecoin in recent months triggered a rally in the digital currency, which started as a social media parody. With his cult following, Tesla boss Elon Musk has amassed considerable power to move markets with his musings, but murky rules make it difficult for regulators to rein him in.