To add to domainers side, as all mentioned technical objectives are almost confirmed.
Etymology is from the Latin:
nov-, novo-, novi- (Latin: new, recent)
-with synonymous meaning in several West & South Europe, East Europe and some Scandinavian languages.
So, in say, half of the European market OPs domain NoviCoin.co and NoviPay.co would be anticipated as the novel financial method without any present reference to FB or trade marks simple as the generic combo. That could be domains with the websites as financial reviews, magazine.
And the most intriguingly in this topic or similar, where new gTLD domains are claimed by well known brands without any fairness, despite as probably their brands omission to register as contenders in global competition and domain markets(to not ignore).
As FB is well know as the beneficial company to global community(at least to their users, and also internet overall), email you've received could be sort of sociologically modelling selling negotiation, so i would respond with some payment request like, reg. fee and intended usage period times ads PPC calculation into something, or maybe exchange for their coin currency.