Deribit, a cryptocurrency exchange, lost $28 million on Tuesday as a result of a hot wallet hack, adding to at least $3 billion in losses from digital asset exploits this year. Deribit tweeted Wednesday that client funds are safe, and that the company will use its reserves to cover the loss. “Deribit remains financially sound, and ongoing operations will be unaffected,” the company said on Twitter. According to Deribit, the company has halted withdrawals to conduct security checks.