Tesla's bitcoin holdings fell nearly $1.8 billion in value last year, as Elon Musk called crypto a 'sideshow'

• The value of Tesla's bitcoin holdings fell nearly $1.8 billion last year, a company filing showed.
• It took a $204 million impairment charge on bitcoin, but converted $64 million worth into dollars.
• CEO Elon Musk distanced himself from crypto last year, calling it a "sideshow to the sideshow."

Tesla's bitcoin hoard plummeted by nearly $1.8 billion last year, as Elon Musk's carmaker dumped a big chunk of its holdings and cryptocurrency prices slumped.