You can also use OpenTimestamps service as described here: https://petertodd.org/2016/opentimestamps-announcement
On Mon, Dec 5, 2016 at 2:11 PM, Bertram Scharpf <li...@bertram-scharpf.de> wrote: > On Thursday, 01. Dec 2016, 19:59:15 -0800, Schlacta, Christ wrote: > > On Dec 1, 2016 7:43 PM, "Bertram Scharpf" <li...@bertram-scharpf.de> > wrote: > > > > > > we all know that kidnappers do publish a picture of their > > > hostage holding up a todays newpaper. The purpose of this is > > > to proof that the victim was alive _after_ a certain point > > > of time. I want to do the opposite. I want to make evidence > > > that I created a document _before_ a certain point of time. > > Thank you all for your detailed answers. > > I might resume it to two possibilities to accomplish the task: > > - Post a digest to a site where you cannot withdraw it > ever and where it can be retrieved by everybody. This > could be a Github issue, on Reddit or Twitter or maybe > even on the GnuPG mailing list. > > The disadvantage is that you are dependent on the > provider of the site to continue the service and that > your information can be found there. This could most > notably become a problem because the post is, in the > end, an abuse of the forum. > > - Let one or more people sign your document and provide > the signatures yourself. > > The weak point is how to find these people and to make > them do what you want. The service > <http://www.itconsult.co.uk/stamper.htm> makes > signatures in a format that is no longer supported. > > Maybe a combination of both methods is a good way to handle > the disadvantages. > > Bertram > > > -- > Bertram Scharpf > Stuttgart, Deutschland/Germany > http://www.bertram-scharpf.de > > _______________________________________________ > Gnupg-users mailing list > Gnupg-users@gnupg.org > http://lists.gnupg.org/mailman/listinfo/gnupg-users >
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