Yes, the class is not responsible for managing any aspect of its storage. It can provide hints, however, and that's what the "ID" and "Immutable" roles do.

It is worth pointing out that no automatic hashing is occurring. You write a function that is invoked on an instance of the class that determines the unique ID. You decide the content-addressibility of your object by choosing the address based on the content.

(If you just want a unique ID per object, KiokuDB assigns a UUID by default as the ID.)