The presentation was given at the Delos Summer School (Tirrenia, June 2008). It illustrates the research activity related to the CASPAR project with specific reference to the authenticity and the need and the possibility to ensure continuity among international projects and their results. The first part is dedicated to define the concepts and the critical issues by taking into account the outputs of InterPARES and the basic framework of OAIS. Both the aspects have been included in the position paper on authenticity defined within the CASPAR project. The second part concerns the effort (under development as part of the Caspar framework for digital preservation) to build management tools fo ensure the verification and documentation of the digital objects authenticity.