The medium (10) has an assembly (16) of elementary evidences (18-1-18-N), in which each evidence is formed of an identifier (ID-N), evidence information (I-N) and data (H-N) e.g. time-stamp token. The data associates a date to the identifier and the evidence information. The date is expressed in coordinated universal timeformat. Each evidence concerning an elementary object e.g. event. A header (14) is formed of a identifier (ID0), list (L) of identifiers (ID-N) and data (H0) associating the identifier (ID0) and the list. Independent claims are also included for the following: (1) a method for creating a data medium (2) a method for utilizing the data medium.
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