First I have to say this Bitcoin the blockchain has never been hacked the exchanges that hold the currency and people that have had their personal wallets have been hacked because they are not securing there bitcoin correctly see my blog on Six Ways To Protect Your Bitcoin Investments From Hackers below thank you.
This is the rise of Bitcoin Detectives and more will come on line including governments that want people to pay their taxes. people think that Bitcoin is anonymous this is false. All transactions are public and the owner of the wallets are unknown untell it is transferred to a wallet with a name attached. The single point of failure is when the Bitcoin is transferred to a person wallet that is public and it then can be traced back just by doing simple integration and computer forensics on that machine that had any communion.