Methods and system for determining reputation information are provided. The method includes analyzing transactional and non-transactional information for an alias associated with an entity and determining reputation information for that alias. The reputation information is transferable across multiple domains. A user can request the reputation information about an entity prior to doing business with that entity. The reputation information is generated for merchants as well as users. The system can generate transaction risk score for every transaction to be conducted between two or more aliases. The system includes an alias identity and reputation validation server computer that receives inputs from various external systems and generated reputation information based on the inputs. Additionally, every individual user/merchant can manage his profile within the reputation database and enter some information manually.