Please, look at this posts:
https://bitcointalk.org/index.php?topic=3068906.msg32254136#msg32254136
https://bitcointalk.org/index.php?topic=3068906.msg32575942#msg32575942
https://bitcointalk.org/index.php?topic=2349366.msg32868747#msg32868747
https://bitcointalk.org/index.php?topic=2871735.msg32869515#msg32869515
https://bitcointalk.org/index.php?topic=3175048.msg32870991#msg32870991