More than 2,000 investors filed a proposed class-action lawsuit against JPMorgan Chase, alleging the bank provided the financial infrastructure that enabled a cryptocurrency Ponzi scheme responsible for at least $328 million in losses.

The complaint, filed on Tuesday in the US District Court for the Northern District of California, named California resident Robby Alan Steele as the lead plaintiff. Steele claims he lost $650,000 after liquidating part of his 401(k) retirement savings and wiring the funds to accounts associated with Goliath Ventures held at Chase.

According to the complaint, Steele transferred $310,000 in cash and an additional $340,000 following a post-tax retirement withdrawal. The funds were allegedly directed to Goliath…