As more companies diversify their charging methods, some of the latest represent a threath to fall in a fraud schema were offline contact, like phone calls or, more often everytime, WhatsApp chatting, make it easier for fraudsters to stage credible fake charging methods. One solution to such threath would be an online service where organizations register their different charging methods, and users can validate if one presented by an offline entity is actually a charging method of the claimed organization.
This code is a concept prototype in solidity for such technology.