As of Universal Bypass 12, there are two types of versions:
Univeral Bypass version, e.g. 12.0.1: The version uploaded to the Chrome Web Store, Firefox Add-ons, Microsoft Edge Addons, and Opera add-ons. In the changelog, this is used for changes which required more than a change in bypass definitions, and is therefore only available with an extension update.
Bypass definitions version, e.g. 931f2f9: The short commit hash representing the bypass definitions version. However, for practicality reasons, the changes between the most recent commit and the last extension update are squashed into a single changelog entry. A full list of commits and their code changes are available on Github.
We're always happy to add new bypasses to Universal Bypass, so if you happen to encounter a website that isn't bypassed yet, please open an issue on Github or send me an email, and we'll try our best to bypass it!