Abstract: A system and method for managing offset project data is provided. The system includes a device which maintains the project data. Project data includes data regarding offset requirements. Transaction data can be associated with the project which can help satisfy at least a portion of the project offset requirements. Transaction data also includes causality and incrementality data for proving a transaction. Proving a transaction can be based on communications accumulated and stored at the device. To help with the communications data gathering, messaging accounts can be provided at the device that are associated with the transactions. When communicating, parties to the transaction can CC or copy the provided account as a way of automatically storing the communications.