ARK Investment, led by Cathie Wood, purchased $13 million worth of Coinbase stock, acquiring 83,000 shares amidst a stock market downturn.ARK also remains bullish on Tesla, with the company being the largest holding in its portfolio.Cathie Wood predicts Tesla's stock will reach $2,600 within five years, citing the significance of their autonomous vehicle technology.Wood's recent purchase of Coinbase stock reflects her confidence in the future of cryptocurrency and blockchain technology.