So download the jpg.
Run exiftool and the author data is base62 encoded.
Decode it to get itrolledyou which you can run on steghide to get a zip.
Unzip dat zip bitch and you find a .png.
Run zsteg and you'll get 30:aDutCu4gwUtnqdVuhLUL6jFueSgRFi
. No idea what the 30: is but remove that and decode the remaining thing.
Its base58 encoded. After that you get the flag but replace the 'o's with '0's.