"Initially, Coinbase ignored me. My succession of emails to their official "whitehat@coinbase.com" domain were ignored until I posted that they weren't replying on reddit"
Deja vu, man.
Deja vu, man.
Banks have entire security teams working around the clock and they work in an area where transactions are mostly reversible. When you work with Bitcoin nothing is reversible so you have to take things even more seriously than the banks.
EDIT: For what it's worth, judging by the upvotes, a lot of people are hoping for any answer.