CanYouSee

To get the file: wget https://artifacts.picoctf.net/c_titan/6/unknown.zip, then unzip unknown.zip.

By running exiftool ukn_reality.jpg the Attribution URL section looks like it has Base64 encoded text (cGljb0NURntNRTc0RDQ3QV9ISUREM05fYTZkZjhkYjh9Cg==). By putting that text into CyberChef with Base64 decoding the flag could be found.

You could also get the flag in one command: exiftool ukn_reality.jpg | grep At | cut -d ":" -f2 | tr -d " " | base64 -d

The first part is getting the line of the Attribution URL section. Then use the cut command with the delimiter of a colon (:) and get the second field. Using the tr command to trim the leading spaces. Lastly, use base64 -d to decode the output and get the flag.

Flag: picoCTF{ME74D47A_HIDD3N_a6d...}