Honestly just a curious question. (I'm not looking for snarky answers to the effect of "world police".)
Honestly just a curious question. (I'm not looking for snarky answers to the effect of "world police".)
They have the authority to issue a subpoena because Bitfinex had US-based customers.
The ability to enforce it is a bit trickier, but there are two things - first, it's plausible that they can get cooperation from local authorities; and second, they are able to seize USD transfers to/from them.
If they hold it as hard cash, practically, sure. If they want to be allowed to send or receive wires and generally not get sanctioned by the United States, no. The U.S. Treasury claims international jurisdiction over U.S. dollars [1].
[1] https://cblr.columbia.edu/the-u-s-jurisdiction-over-transfer...
[1] https://webcache.googleusercontent.com/search?q=cache:vl90MA...
Disclaimer: I'm not a lawyer, just found this from a cursory search.
William Shakespeare, Henry IV, Part I
There are actually two issues here: Firstly, on what basis, under US law, does the CTFC have the authority to issue a subpoena, and secondly, whether, under international law or treaty, it has any power to compel compliance. The link in sna1l's post has something on both issues.