Could Bitfinex, the world's largest, Hong-Kong based cryptocurrency exchange, be headed for a Mt. Gox-style collapse? It's starting to look that way. When Mt. Gox first halted customer withdrawals in February 2014, it waited more than two weeks to admit the truth to its customers: that hackers had stolen more than $450 million of their assets, leaving the exchange bankrupt and them holding the bag. That hack effectively crippled the entire digital currency ecosystem, ushering in a two-year bear market that at one point carried the bitcoin price below $200, from what was then a record high north of $1,200 reached in November 2013.