We strongly oppose the Unified Attestation initiative and call for app developers supporting privacy, security and freedom on mobile to avoid it. Companies selling phones should not be deciding which operating systems people are allowed to use for apps.

https://uattest.net/

Unified Attestation

Unified Attestation is a free, open-source alternative to Google Play Integrity with offline verification and simple app + server integration.

@GrapheneOS The opposite is true: this is an initiative for an open-source, transparent, and publicly verifiable certification. The Graphene OS team is also invited to join the consortium or simply use UnifiedAttestation for free. The intention is to promote competition and alternatives.
@volla Android already has a standard hardware attestation API. The sole purpose of your Unified Attestation system is a power grab where you put yourselves in control of what's allowed to be used. You do not get to make any demands of GrapheneOS in order for it to be permitted. It's not legal for you to make a system which forbids using other options to your products unless those join your cartel and comply with your demands. You aren't a neutral party and have massive conflicts of interest.