UNALTERABLE NOTIFICATION SERVICE

A technique is presented of providing, in an electronic central server, transactional information to a user. The technique includes receiving a set of transaction messages from a set of transactional information sources, each transaction message including respective transaction data. The technique also includes generating a transaction history from the set of transaction messages, the transaction history including the respective transaction data of each transaction message. The technique further includes delivering an aggregate message to a set of user devices, the aggregate message including the transaction history and being presented in atomic form to the user in order to prevent an attacker from excising particular transaction data from the aggregate message.