Zimpley is planned as a direct-download Mac app first. That means the public website, the release admin panel and Sparkle updates must all agree on the same published build.
The release record stores the version, build number, channel, minimum macOS version, DMG metadata, checksum, Sparkle EdDSA signature and localized release notes. When a stable release is published, the landing download button can point to the same artifact that the appcast advertises to installed users.