According to CoinMeta, Coinkite faced criticism for retaining customers' emails after experiencing a cold wallet hacking attack that resulted in a loss of 88 million US dollars. The company sent out security notifications to its customers, warning them of the high risk of losing their bitcoins. Nevertheless, Rodolfo Novak, co-founder and CEO of Coinkite, ensured that the company only retained customer data for 90 days after a purchase.