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Google's servers send the signed attestation to the SafetyNet Attestation service on the device. The SafetyNet Attestation service returns this signed attestation to your app. Your app forwards the signed attestation to your server. This server validates the response and uses it for anti-abuse decisions.

The SafetyNet Attestation API provides a cryptographically-signed attestation, assessing the device's integrity. In order to create the attestation, the API examines the device's software and hardware environment, looking for integrity issues, and comparing it with the reference data for approved Android devices.

Get started using App Check with SafetyNet on Android Set up your Firebase project. Add the App Check library to your app. Initialize App Check. Next steps. Monitor metrics and enable enforcement. Enable App Check enforcement. Use App Check in debug environments.

Gateway Attestation (C) ? The service provider has authenticated from where it received the call, but cannot authenticate the call source. An example of this case would be a call received from an international gateway.

"Gateway Attestation", "C", indicates the call can only be verified as coming from a known gateway, for instance, a connection to another service provider.

The originating telephone service provider checks the call source and calling number to determine how to attest for the validity of the calling number. Full Attestation (A) ? The service provider has authenticated the calling party and they are authorized to use the calling number.

Full Attestation (A) - The identity of the caller is known, and they have the right to use the Caller ID for this call. Partial Attestation (B) - The originator knows the identity of the caller, but cannot confirm their right to use the Caller ID.

Essentially, the attestation levels are designed to protect the integrity of the telecom networks and provide a way to signal confidence levels to other carriers that the calls can be trusted, and at what level.