Coinbase was aware of the data leak as early as January, which could cost up to US$400 million.An India-based employee of TaskUs, a US outsourcing firm, was involved in the breach by leaking customer information.The stolen data included names, addresses, emails, account balances, but private keys and passwords were not accessed.Coinbase confirmed cutting ties with TaskUs personnel involved, and the US Department of Justice has launched an investigation into the breach.