Thanks so much for the deep dive. I love learning from such concise facts.
To add, also @[email protected] : There is only one known species of vertebrates without hemoglobin. The Crocodile Icefish, it once had it in its blood and lost some genes to synthesize it. The debate about why is still ongoing, with the currently favored theory that they adapted to a high oxygen and low iron environment.
It is quite a bit out of date luckily. Signal-Desktop already stores data encrypted for quite a while. However it used to store the decryption key right alongside it. Recently (a few month ago) Signal switched to storing the key within the systems keystore, greatly improving security. Also causing a flood of users complaining that the can’t just copy their .config to a new desktop and retain their chat history. This may have prompted the release of this new feature :)