So check this out.
These are their facebook pages:

Jaap Terlouw
https://www.facebook.com/kiev.jaap
Donna Khuyz
https://www.facebook.com/profile.php?id=100011220692099

Her name is actually Ketrin, but who cares, right?
both are from Kiev Ukraine
Jaap looks like an ordinary fella. pretty ugly though, but you dont need good looks to run a multi-million cryptocurrency scam.





Donna on the other hand is more interesting. Turns out she runs a flowers shop. Wtf??!?!?
link:
https://www.facebook.com/DonnaFlowersKiev/



and just a year ago she used to sell tickets to the parties...

and now she is a segwit2 core developer. that's a pretty sudden career twist, innit?

she looks good in that bikini though:





she is basically a promo-model. she gets paid to advertise stuff. most likely someone's just paid her to put her face on the webpage