Question for someone who may have done this or knows more. How do you sue a Crypto exchange and where do you initiate it? I live in US however what happens if the exchange does not have any presence in US?

HITBTC seems to be systematically blocking thoughts of users from accessing their account in pretense of security and a class action suite seems to be the only option left. Any one has any idea how to peruse this? Any attorney who may be willing to take this?

Any help in this regards is appreciated.