I intend to cash out some bitcoin (not an immodest sum) within the next 10 days.  I'm struggling to find an exchange that is actually functional anymore! Even the ones i'm with are not answering when I try to change the address on my account (which i need to do before I cash out any coin ..for tax purposes).


What are the most competitive exchanges which are largely functional right now in terms of registering with them and getting verified with them?  Do they also have functional and timely support?