The above image has some cashu encoded with steghide. Youcan find the basic commands to decrypt the cashu string in this note nostr:note1tc0fdyx9n7lj3v5hl0dune9vveskzstwm2d6lyjym34aps4tjtzq2ntse8

PS all you need to install is steghide (if you are using Debian or ubuntu you can install it via apt). Have fun and if you have any questions feel free to reach out, cheers