GmsCompat (sandboxed Google Play compatibility layer in GrapheneOS) will have it's library signed with a separate key to allow for out-of-band updates. Should allow faster delivery of app compatibility fixes without waiting on new releases of GrapheneOS for the most part.
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You may have seen releases for GmsCompatConfig before. This is just a text file that sets up configuration for GmsCompat.
Some config examples are the type of data to return to Google Play when it attempts to do privileged functions. The sandboxed Google Play compatibility layer acts as an intermediary to allow app compatibility without privileged access.
https://github.com/GrapheneOS/platform_packages_apps_GmsCompat/blob/45b13b45de7c76a528cdc236d66d3184595cd99a/gmscompat_config