If I understand it correctly masternodes locks transaction and broadcast it to the network as confirmed and prevent from double-spend. It is not yet confirmed by mined blocks as it should be but network sees this locked tx as spendable (confirmed). Basically MN confirms that for you and lock it but network doesn't.
InstantX is a powerful thing. Can be very dangerous for DRK if someone could misuse it before it mature
Having 3 people in control of >51% of the hashrate is very dangerous for DRK (and every other PoW currency) but nobody cares.
I'm done being polite about this, anyone who thinks PoW via centralised pools 'secures the network' is a fucking moron.
By dangerous I mean that someone could do a double-spend cos this approach (technology) has not been checked by time. But I am a great supporter of this and "knowing" Evan, everyting should be ok