Marko started to follow the breadcrumbs. The keys in the comments were initials and dates. He traced one chain to an encrypted ZIP tucked deep in a defunct archival folder labeled OLD-BUILD-2009. He clicked open and the archive asked for a password. The wincmd.key-driven search window offered a suggestion in italics: Check the README in ../tools/signer.txt. The signer.txt had a note: "Last key: 4 chars of the commit hash + day of the month." That was the sort of small human hint someone leaves for themselves, half puzzle, half memory.