when i look at the premine i am note sure that its existance is motivated by your claim.
What has DRK's "premine" got to do with Darkwallet's 'motivation' ?
- they get a huge portion of the mining reward by doing nothing (compared to a miner)
So what ? They are needed just as miners are needed so they get rewarded. The miners are happy, masternodes holders are happy and the network gets the services it needs.
- there are not enough of them to really make sure they dont get hijacked
Who says ?
What is enough ? And what do you mean by "secured" ? I think you're confusing mining 50% attacks with someone owning lots of masternodes. The darkcoin blockchain is secured by miners the same as Bitcoin's is. What is someone who hijacks a bunch of masternodes going to do other than "be of service" to the network ? (People already have "hijacked" loads of masternodes to use your terms and all they can do is run them. There's no 50% attack like in mining).
Vulnerabilities have been identified (by Darkcoin's own devs and community) such as being able to access logs etc and somehow "mine" them to work back and de-anonymise certain transactions but that doesn't bother me. Over time the network improves in security and gets hardened. Anyway, they are not systemic vulnerabilities which is what's important.
- i dont understand what masternodes have to do with bitcoin-api compatibility
They don't have anything to do with it. The Darkcoin blockchain does.