With a dump truck full of unmarked dollars in small denominations in some dark Bangkok alley, provided by generous institutional investor. Obviously.

They say it's their "institutional investors", they never release who these are (some people say it's Bitfinex themselves), they never release what bank they use or which country is the money deposited in.

It's rotten to the core... The consensus is that they either don't have that money at all (most likely scenario) or that if they do it's all dirty money and they are operating a money laundry scheme....