One thing I wonder for private keys that have been sitting around for 10+ years -- this guys, or even Satoshi Nakamoto's original keys -- just how good is the encryption? I guess even a few computers running non-stop for 10 years probably won't crack it, but could the NSA, or maybe the North Koreans? When we finally get quantum computing, will it be trivial to break the encryption and grab those bitcoins? Or is there a chance that the software he used to create the key has a flaw in its encryption algorithm? (Apparently, a non-trivial number of ransomware programs have bad key generation algorithms, per "The Ransomware Hunting Team" - an interesting read BTW.)