interface StartupAssets {
    interface Factory {
		    StartupAssets fromInitialConditions(@NonNull Path workingDir);
    }
    
    /**
     * Called by a node that finds itself with an empty RosterService
     * state, and is thus at the migration boundary for adoption of the 
     * roster proposal; implementations must either throw unsupported or
     * return an aggregation of the information in legacy config.txt and
     * public.pfx files.
     */
    @Deprecated
    Network migrationNetworkOrThrow();
    
    /**
     * Called by a node that finds itself with a completely empty state. 
     */
    Network genesisNetworkOrThrow();
    
    /**
     * Returns a Network description if there is an override-network.json
     * on disk that has not already been used in an earlier round than the
     * given number.
     */
    Optional<Network> overrideNetwork(long roundNumber);
    
    void archiveInitialConditions();
}