As financial market infrastructures, central securities depositories (CSD) take over the custody and transfer of fungible securities. On the one hand, this takes place in the form of physical security pieces, which is rather unusual today, and on the other hand, in the form of book entries (so-called effects giro). When issuing securities, CSDs take on a quasi-notarial function and ensure the correct registration of the issued securities. As a result, the CSD is responsible for contributing to the integrity of the issue over the entire life cycle of the securities. When booking in the securities account, this is done on the one hand by safely storing the documents (usually a so-called global certificate) in a CSD safe. On the other hand, through the regular comparison between the overall issued holdings according to the documents held by it and the respective individual holdings of the CSD participants in the relevant security.