Timestamping signed documents or detached signature files

Wiktor Kwapisiewicz wiktor at metacode.biz
Sun Jul 22 21:57:13 CEST 2018

> Thank you very much for the additional infos and links, i will read them
> all.

Oh, I forgot to mention that timestamping using blockchains is actually 
very easy, for example I timestamped my key's fingerprint:


(look for timestamp+bitcoin-transaction at metacode.biz 

And you can check out the transaction here:

(look for "OP_RETURN 653909a2f0e37c106f5faf546c8857e0d8e8f074" that is 
my key's fingerprint).

If you convert "time": 1507539820 seconds from there to date you'll get 
something like 2017-10-09T09:03:40.000Z.

OpenTimestamps (I think) uses Merkle trees to minimize fees but the 
downside is that the hash is not directly embedded in the blockchain and 
you need the extra files to reconstruct the tree root.

Have a nice day!

Kind regards,


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