Coinbase on Thursday announced hackers bribed some of its overseas employees for customer data and demanded a $20 million ransom from the company, a request Coinbase said it denied while forecasting costs up to $400 million to remedy the incident.

Coinbase has been hit with a flood of lawsuits after it recently disclosed its user data was breached, with users accusing the crypto exchange of mishandling the incident. At least six lawsuits were filed against Coinbase between May 15 and May 16,

Cryptocurrency company Coinbase says a recent cyberattack that targeted customer data is set to cost the firm as much as $400 million.