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# History
This is a living document that documents the history of the Sigsum project.
## 2019
Mullvad VPN announced a project named System Transparency
[\[1\]](https://mullvad.net/en/blog/2019/6/3/system-transparency-future/).
System Transparency is a security architecture for bare-metal servers that aims
to make a system's boot chain remotely verifiable by any interested party
[\[2\]](https://www.system-transparency.org/).
Fredrik Strömberg presented the System Transparency design at PUTS
[\[3\]](https://petsymposium.org/2019/files/workshop/abstracts/PUT_2019_paper_32.pdf).
One part of the design included a Certificate Transparency log
[\[4\]](https://mullvad.net/media/system-transparency-rev5.pdf).
Rasmus Dahlberg suggested use of a separate System Transparency log.
## 2020
In October, Fredrik Strömberg and Rasmus Dahlberg started focused design
iterations on a transparency log that would be better suited for the System
Transparency project
[\[5\]](https://github.com/system-transparency/stfe/commit/40250377da81864e9e502b803c0543c48e4a0615).
## 2021
Linus Nordberg joined the System Transparency logging discussions in January. A
few months later, drafts of the resulting design were presented at PADSEC
[\[6\]](https://web.archive.org/web/20210427203606/https://hopin.com/events/padsec)
and SWITS
[\[7,](https://web.archive.org/web/20210603112144/https://swits.hotell.kau.se/AnnualSeminars/SWITS%202021/SWITS_2021/SWITS2021_Programme.htm)
[8\]](https://web.archive.org/web/20210923134324/https://swits.hotell.kau.se/AnnualSeminars/SWITS%202021/SWITS_2021/SWITS_2021_paper_17.pdf).
In June, Fredrik Strömberg, Rasmus Dahlberg, and Linus Nordberg decided to
rebrand System Transparency logging as a separate project that is funded but not
governed by Mullvad VPN
[\[9\]](https://git.sigsum.org/sigsum/tree/archive/2021-06-21--meeting-minutes).
The Sigsum Project launched in October
[\[10\]](https://lists.sigsum.org/sigsum-general/msg00001.html).
It is managed by Rasmus Dahlberg (Mullvad VPN) and Linus Nordberg (independent).
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