ErrAlreadyStored is raised if the caller tries storing a response which has already been stored.

ErrNotFound is raised if the caller tries to retrieve data for an revision which has not been processed and stored yet.

Result describes the monitor's attempt to verify the complete transition from SignedMapRoot (SMR) revision T to revision T+1, having been supplied the set of mutations by which to transform SMR T into SMR T+1.

Interface is the interface that stores and retrieves monitoring results.