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See http://TrueTimeStamp.org Free. Easy to manually time stamp files or a file's SHA256 hash. Easy API for automated time-stamping by calling http://truetimestamp.org/submit.php?hash=YOUR_SHA256_IN_HEXADECIMAL_HERE Easy verification of time-stamps on the website by supplying the file or its hash. Supplies Certificates that can be verified even offline. ...

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