is anybody aware of some smart-contract that can be used as external "trustable" oracle for no-so-simple scenarios, like for example calculating the number of non-festive days passed since a given date or time-windows.
I'm thinking of some external (trusted) entity that is allowed to fill such calendar and sign when a new day has passed, ...
I'm thinking about use-cases like: - Some smart-contract internal state change or some payment must be allowed just after 10 working days, excluding weekends.