Headaches at Coinbase: A data breach, a $20 million ransom demand, and a federal investigation into ‘verified users’

• Coinbase, the world's largest cryptocurrency exchange, is having a rough week. In the run-up to Coinbase joining the S&P 500 on May 19, the company announced it was hit by a data breach and refused to pay a $20 million ransom demand from the cybercriminals who stole user data. The company is also facing a fresh SEC investigation that's looking into whether the company misstated its user numbers in past disclosures.

Coinbase will officially join the S&P 500 on Monday...