[oxalo]

What's the possibility someone brute forced his private key?

[valarauca1]

Highly unlikely.

Bitcoin private keys are 256bit ECDSA keys. The largest key (publically broken) of this type is ~114bit PS3 hardware key which took 17 months on ~2600 systems.

Reference: https://en.wikipedia.org/wiki/Elliptic_curve_cryptography#Ke...

[maxerickson]

Roughly 0.