Every retained version of a world, what actually changed between any two of them, and a rollback that adds a version rather than erasing one. Everything below is read from the API; nothing on this page is a placeholder.
A saved version is immutable: once written it is never overwritten, which is what makes a rollback trustworthy. The list only ever grows.
Computed by comparing the two stored manifests, not by reading anyone's description of them.
The world's own record of what happened to it, grouped by the version it happened at. A rollback appears here as an event, alongside the expansions it undid.
Restoring earlier content. This is an internal-tester action and only the world's owner can perform it.