Hey guys this is pure scam do not fall for it please don not send ether to them  Arcah is not exist it has no eth contact address they already did like this back in November 2017
This is the old threat:
https://bitcointalk.org/index.php?topic=2381684.0
posted by bitcointalk User (Arcah:https://bitcointalk.org/index.php?action=profile;u=1298839)

 and now Arcah_J(https://bitcointalk.org/index.php?action=profile;u=2104087)