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Tibiaster djanybekensis
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1991
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How to time-stamp a digital document | SpringerLink
Stuart Haber, W. Scott Stornetta
Mon 05 Aug 2019 05:05:10 PM CEST
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https://link.springer.com/article/10.1007%2FBF00196791
1991
article
blockchain
origine
scientifique
timestamp
Photo - Heureka Zürich | notrehistoire.ch
Fri 04 Feb 2011 01:00:49 PM CET
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http://www.notrehistoire.ch/photo/view/6226/
1991
exposition
galileo
heureka
science
tour
Zürich
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