The public corporation shall commence its existence effective upon filing of its charter as issued and attested, unless a different time be specified therein. Except as against the state or the city in a proceeding to cancel or revoke the charter, or to compel compliance with a representation made in the application, filing of an original charter and delivery of a duplicate original charter shall conclusively indicate that all conditions precedent have been fulfilled and that the public corporation has been established in compliance with the procedures of this chapter. [Ord. 9478, 1985].