My PC is running back up right now. I'll post the signed message after it finishes and I figure out how to do it. If you feel you need to report this post, by all means, do what you feel need to do
If you don't know how to sign messages maybe this can help you.
How to sign a message?!It's regrettable to lose 11 BTC that's a huge amount we thought, but why not choose a cold wallet as suggested by others as it's not worth such a huge asset but keeping it in a hot wallet which might be vulnerable to hacker attacks when you experience its negligence.
It's just a lesson because it's impossible to get coins back, so in the future, be more careful.
Hope you don't get depressed.