Part of the DeviceCheck services, the new App Attest API helps protect against security threats to your apps on iOS 14 or later, reducing fraudulent use of your services. With App Attest, you can generate a special cryptographic key on a device and use it to validate the integrity of your app before your server provides access to sensitive data.
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developer.apple.com/news/?id=2sngpulc
Apple have added an attestation API to their DeviceCheck framework.