Monitors display Coinbase signage during the company's initial public offering at the Nasdaq MarketSite in New York City on April 14, 2021. Robert Nickelsberg | Getty Images News | Getty Images Coinbase CEO Brian Armstrong said Tuesday that the company will cut roughly 14% of its workforce, citing a combination of market volatility and AI quickly changing how the company operates. The move comes ahead of Coinbase's first-quarter earnings, which the company is scheduled to report Thursday. Shares were up nearly 4% in premarket trading. In a memo to employees, which he shared on X early Tuesday, Armstrong described the decision as necessary to position the firm for its "next phase of growth" while navigating the current downturn in the crypto market.…