http://www.rfc-editor.org/rfc/rfc4998.txt
RFC 4998: Evidence Record Syntax (ERS), T. Gondrom, R. Brandner, U. Pordesch2007-08-01T23:00:00-00:00In many scenarios, users must be able prove the existence and integrity of data, including digitally signed data, in a common and reproducible way over a long and possibly undetermined period of time. This document specifies the syntax and processing of an Evidence Record, a structure designed to support long-term non-repudiation of existence of data. [STANDARDS-TRACK]