It took me a bit to realize that what you're referring to as "error code" in many other contexts is "checksum"... this may just be the domain I work in but for

It took me a bit to realize that what you're referring to as "error code" in many other contexts is "checksum"... this may just be the domain I work in but for me, "error code" usually means an "id that signifies a specific error happened" Another thought is that UUID V4 (which is the most common UUID implementation I've seen in the wild) also does not have a checksum. Though I think in general a checksum is probably a good idea if you want to help prevent people from mistyping the code or an optical reader from making an error.