@sodiboo I think it's cus this isn't a one step operation where all information is sent at once, instead it's first the verification bytes being sent (without signing) to prepare phone for transaction, and then second one which now has actual transaction details which are signed. First one seems to just be used to determine: what type of device is the reader and if it requires OS level verification of transaction. (At least that's how I understood it from the video, might be wrong)