Verification for which part? Hetzner used to have DTAG peering but dropped it a year ago because Telecom wants to have a premium paid for it. Hetzner was not willing to carve. This is just the response to some customers wanting to have faster connection to T customers. This story is unfortunately not new.

//EDIT: this thread goes back more than two years: https://telekomhilft.telekom.de/t5/Telefonie-Internet/Perfor...