GrapheneOS is a privacy and security focused mobile OS with Android app compatibility developed as a non-profit open source project. These are the features of GrapheneOS beyond what's provided by version 16 of the Android Open Source Project. This means GrapheneOS provides hundreds of relevant kernel patches including many security patches not yet included in the stock OS. Even if the computer you used to flash GrapheneOS was compromised and an attacker replaced GrapheneOS with their own malicious OS, it can be detected with these features. Installing GrapheneOS flashes the GrapheneOS verified boot public key to the secure element.