SonicVortex is a way to hide encrypted transactions by steganography.
You take a picture, author a transaction, then SonicVortex embeds the encrypted transaction in a picture.  It uses the f5 steganography algorithm, which uses matrix encoding to hide the picture, making it almost impossible to detect that any hidden communication is present.
Moreover, the encryption is state-of-the-art AES/GCM encryption, suitable for banks and governments. So even in the highly unlikely event that any communication becomes suspected, it is impossible for an adversary to ascertain the nature of the communication. Thus, your transaction is hidden and protected from even the most powerful adversaries.
Additionally, AES/GCM protects against any changes to the encrypted, hidden transaction. If just one pixel of the picture is changed, it will be detected and the transaction rejected.