Oh, and change the thread title from "[ANN] Coinbase account was hacked..." to "I have no idea how Coinbase works so can someone please explain it to me"
It does not take a rocket scientist to figure out that you put money into one place and then something other than yourself transfers it out. YES been with bitcoin from day one. Used coinbase for hundreds of transaction. So yea guess you can say i am pretty versed in coinbase protocol
OK, so was your Coinbase account drained (total balance changed) or was it just the Bitcoin address that Coinbase gave you to make the deposit drained and sent somewhere else?
Please also post the Bitcoin address you sent your coins to so we can help you figure out where they went.