A self-modifying data container for improved data security and methods of use are disclosed. The self-modifying data container includes a data storage structure for storing financial transaction information. The self-modifying data container also includes a data manager stored as code within the container. The data manager can run on a system hosting the self-modifying data container. The data manager can access transaction information in the data storage structure and modify the data in response to modification triggers. The data manager can delete data in the data storage structure. The data manager can also encrypt data in the data storage structure. The self-modifying data container improves both data security and data privacy.