Chimera is an open source, free tool that lets you embed any file (like a .pdf, .wav, .mp3, or alternate art version) or even entire folders directly into a .png, .gif, or .mp4.
When you mint the resulting media file on any existing contract, it appears and functions normally, viewed as an image or played as a video. However, if someone renames the file extension to .zip and opens it with a standard extraction tool (WinRAR, 7-Zip, etc.), they'll see the files you attached.
Upload a Chimera file (.png, .gif, or .mp4) to extract its hidden contents. The files will be downloaded as a ZIP archive.