A system may include transaction storage devices. Each transaction storage device may include a data store configured to receive, from a first entity, a request to push a detailed transaction corresponding to a secure identifier. The secure identifier may be generated, using an encoding function, from a user identifier of a user. The data store may be further configured to store the detailed transaction based on a first determination to trust the first entity. The system may further include an access controller configured to perform the first determination by applying a first security rule corresponding to a type of the secure identifier to the request to push the detailed transaction, and a registry configured to store at least the first security rule.