Proof for a creation date

[Brian Minton]

On Fri, Dec 02, 2016 at 01:37:00PM +0800, Quan Zhou wrote:
> so GnuPG's timestamping isn't an option for this?
> Even X509 has a timestamping feature for this kind of use.
> 

No, because you could just set your computer's clock to anything you want,
then create the GnuPG /X509 timestamp.  

I agree with some of the other posters; the best way is to either post the
whole message, or a cryptographically strong hash of it to some public
append-only location, and the Bitcoin blockchain or a certificate transparency
log both do it the same way, via a cryptographic hash inserted into a Merkle
tree.  That has the desired properties of being append-only and publicly
auditable.

-- 
Brian Minton
brian at minton dot name http://brian.minton.name
Live long, and prosper longer!
OpenPGP fingerprint = 8213 71DD 4665 CF4F AE20  2206 0424 DC19 B678 A1A9
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 390 bytes
Desc: not available
URL: </pipermail/attachments/20161202/754dbdf2/attachment.sig>