A class-action lawsuit has been filed against cryptocurrency exchange startup Kraken over issues stemming from its management of a May flash crash.

Less than two months later, five customers of the exchange are alleging negligence, breach of contract and unjust enrichment, arguing that Kraken should have suspended trading amidst a denial-of-service (DDoS) attack that impacted its operations.

Source:
http://www.coindesk.com/ethereum-class-action-lawsuit-filed-against-digital-currency-exchange-kraken/