I did a similar stunt with an old PowerBook where I electrically disabled the WiFi/Bluetooth so it wouldn’t be online unless I plugged in Ethernet, generated keys, and played around with mining. This was back in 2010 when this was all just basically toys for fun. I also encrypted it all with FileVault.

Then I forgot my pass phrase and have never been able to recover any of it. I don’t even know how many btc were mined/lost.

Before anyone asks, no, there aren’t any usable exploits / vulns found for the encryption methods used. And from what I can tell the coins in question have still sat frozen for going in a decade and a half now. I suspect many other hackers did the same thing…