Hi Bertram, sorry for the late answer. Blockchain was mentioned in some answers, but nothing in concrete. Check this out: https://github.com/opentimestamps
Rgds Richard Am Freitag, den 02.12.2016, 03:12 +0100 schrieb Bertram Scharpf: > Hi, > > 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. > > I could use self-darkening ink but that won't be reflected > in a JPEG scan and my pen won't make the job that TeX does. > I could sign a newspapers home page but that cannot be > reproduced at a later point of time to verify the signature. > > Is there a standard way in GnuPG and in the keyholder > infrastructure to accomplish this task? > > Thanks in advance. > > Bertram > >
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