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The timestamp is an electronic document issued by a trustworthy Timestamp Authority (TA) which acts as evidence that digital information existed at a certain date and time in the past. COMPROVA.COM is the first local Timestamp Authority certified by the Brazilian National Observatory (Observatório Nacional do Brasil - ON), an institution linked to the Ministry of Science and Technology (Ministério da Ciência e Tecnologia - MCT), which is legally responsible for generating, maintaining and disseminating the Brazilian Legal Time. This technology allows Brazilian Legal Time to be affixed to digital documents in a safe, authentic and subject-to-audit form, and as such is not only proof of time but also a guarantee of content.