Recovering old wallet

firebat45
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Back when Bitcoin was just launching (somewhere around late 2009-2010 IIRC) I was big into overclocking and used [email protected] to stress test my machines. I tried Bitcoin out for a while and mined several hundred BTC, which was worth essentially nothing at the time.

So yeah, I've been looking through old harddrives trying to find the wallet data. This is obviously an old offline style wallet, not the newer style. Definitely didn't have a recovery phrase. I *think* I might have found it but I can't seem to make sense of the file contents. Obviously I am pretty hesitant to share the contents of the file with anybody to see if they can recognize which bit might be the private key. The file is 4 lines, 239 characters.

What is the best way for me to try and decipher this?