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I don't understand why Heads and Pureboot are not mentioned here, which are FLOSS: https://docs.puri.sm/PureBoot/Heads.html#heads.

How does Heads and Pureboot solve the Root of Trust issue outlined in the blog post?

Heads relies on TPM and a hardware key to verify the integrity of the firmware.

Heads makes use of a root of trust, it doesn't provide one