KristofMiha You need to click “reply” to my post for me to get a notification that you replied :)
KristofMiha I didn't understand some of the things that were displayed
The purpose of the Auditor app is to give you information about the device. So Auditor by itself is useless if you don't do anything with the info it gives you.
These are the most important parts: your “device”, which should be your Pixel model; your “OS”, which should show “GrapheneOS (unmodified official release)”; and the patch levels, which should be up-to-date to at least the current month and year that you're using the Auditor app, if the GrapheneOS version you have is up-to-date. If these details match what you expect, then the device you scanned should be a real Pixel device of this model, with the real GrapheneOS installed on it with a properly locked bootloader, and a relatively up-to-date version of it too.
There's also the security level, which should say “High — Hardware Security Module (HSM) with pairing specific attest key”, which means you're getting the information from the most secure component in your Pixel device, the Titan M2 chip (i.e. the HSM), and successfully created a key that is needed to pair the scanned device with the device you scanned it with, so at the next times you could recognize your device rather than a device with the same reported model/OS/version/etc.
If it's the first time you use the Auditor app with the device (or if you cleared the Auditor app's memory of its pairings), expect the results to say “Successfully performed basic initial verification …” in the first line; if it's not your first time, expect to see “Successfully performed strong paired verification …” instead, and at the bottom you should see the first and last times you verified this device, which should also match your expectations.
If anything you see is different from what I said above, something is wrong.