Has the bitcoin system ever been hacked until now? Is there any security vulnerability in the Bitcoin system up to now?
If I am going to analyze it now, bitcoin is 90% safe. The 10% remaining maybe goes in some issue regarding about the circumstances of bitcoin. Even most member said here that bitcoin is more safe than any banks, company, Paypal, or etc. But still it can be hack by a professional hacker. But I think it will only happen once in a blue moon.