Sincerely you cannot hack Bitcoins or the ledger Blockchain.

There has been several reports crimes reported regarding bitcoin hacking, but nowdays it is not possible to hack it. As the network strength is very high don't even think about hacking the network.

The only possible methods of hacking bitcoins are

Hacking into a mining pool
Doing a MITM attack
Social engineering a bitcoin user
Hacking a private key
Hacking any online walletswallets
Those are coded very well without any loopholes, they are stronger the weaker part is human. Yes humans can be easily hacked, but not bitcoins.