A quine is a program that outputs its own source code. In the context of Scratch, I've chosen to interpret that to mean outputting a base64 representation of the project's SB3 file. (The output is long, so if you want to copy it, you may need to triple-click to select all of it.) (Technically, you could argue that this project itself isn't a quine, because uploading the project to Scratch changed the way its data is stored, and therefore this project's file isn't identical to its output; at the very least, though, I think that the OUTPUT of this project should count as a Scratch quine.)
If you want some information on how I made this, there's a comment in the project that describes my process. This was useful for understanding crc32 checksums: http://web.archive.org/web/20181108155847/http://www.repairfaq.org/filipg/LINK/F_crc_v3.html
