Timestamping signed documents or detached signature files
wiktor at metacode.biz
Sun Jul 22 20:39:52 CEST 2018
> Maybe you find this little info useful too, because i have not seen
> this topic discussed here yet. I'm aware that there is or was an
> old Timestamping Service in England available, but i thought
> that the blockchain is cool.
Yep, this is definitely cool.
I don't know if you've seen it but there is also a helper script for
timestamping git commits:
And one minor note, that it's actually possible to (ab)use X.509
timestamping servers for OpenPGP because they just timestamp any hash
that you give them (see e.g. ). You could embed the TimeStampResp 
in a signature notation (assuming you would timestamp file hash, not the
signature itself, of course).
Another interesting tidbit, RFC 4880 contains a Timestamp signature flag
(0x40 ) and a way to nest signatures, that could be used to provide
timestamping or notary services .
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