What a timestamp establishes — and doesn’t
A timestamp records that a piece of information — typically a cryptographic hash — existed at a particular time. It is evidence of existence, not a verdict.
What a timestamp establishes
It can show that a hash representing your file existed at or before a certain time. An independent trusted timestamp can do this without uploading the artwork itself, so the evidence persists even if this service disappears.
What a timestamp does not establish
It does not prove when the artwork was originally created, who created it, or who owns the copyright. The artist-reported creation date is entered by you; the service does not verify it.