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Thanks for the link to the Czech article. Using Google translate it's possible to understand what they are talking about. The article again confirms (similarly to older announcements) that the chip will not be entirely open-source. Google translates it as "
a largely open" chip where the idea is to be able to verify and audit that it doesn't do anything it is not supposed to do and that it doesn't have additional components that could assist in supply chain attacks.
Tropic Square is preparing the so-called Secure Element (SE) chip, which is supposed to be largely open. Among other things, this will enable its auditability. It is supposed to verify, among other things, that the chip is manufactured exactly according to the design, and therefore that there has been no modification or addition of an implant in the supply chain (generally referred to as a supply chain attack).
Source:
https://www.lupa.cz/aktuality/cesky-cip-tropic-square-jde-do-vyroby-vyrabet-se-bude-na-tchaj-wanu/?utm_source=rss&utm_medium=text&utm_campaign=rss