The magic code from the linked post is sha1 for "usethesource\n", the one I gave is for the same string without the trailing "\n" (which is here probably due to

The magic code from the linked post is sha1 for "usethesource\n", the one I gave is for the same string without the trailing "\n" (which is here probably due to a `echo usethesource | sha1sum` instead of `echo -n ...`).