code: def verify2(self, atv_public_key, data):
          
          self._check_initialized()
          log_binary(_LOGGER, 'Verify', PublicSecret=atv_public_key, Data=data)
  
          # Generate a shared secret key
          public = curve25519.Public(atv_public_key)
          shared = self._verify_private.get_shared_key(
              public, hashfunc=lambda x: x)  # No additional hashing used
          log_binary(_LOGGER, 'Shared secret', Secret=shared)
  
          # Derive new AES key and IV from shared key
          aes_key = hash_sha512('Pair-Verify-AES-Key', shared)[0:16]
          aes_iv = hash_sha512('Pair-Verify-AES-IV', shared)[0:16]
          log_binary(_LOGGER, 'Pair-Verify-AES', Key=aes_key, IV=aes_iv)
  
          # Sign public keys and encrypt with AES
          signer = SigningKey(self._auth_private)
          signed = signer.sign(self._verify_public.serialize() + atv_public_key)
          signature, _ = aes_encrypt(modes.CTR, aes_key, aes_iv, data, signed)
          log_binary(_LOGGER, 'Signature', Signature=signature)
  
          # Signature is prepended with 0x00000000 (alignment?)
          return b'\x00\x00\x00\x00' + signature
docs: Last device verification step.