What is the confirmed field in the user's passkey

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What is the confirmed field in the user’s passkey object?

{
            "id": "passkey|xxx",
            "type": "passkey",
            "confirmed": true,
            "key_id": "xxx",
            "credential_device_type": "multi_device",
            "credential_backed_up": true,
            "identity_user_id": "xxx",
            "user_agent": "Firefox 127.0.0 / Mac OS X 10.15.0",
            "public_key": "xxx",
            "created_at": "xxx",
            "last_auth_at": "xxx"
}

Could not find a reference to it anywhere.