In response to the attack that was carried out today on navajocoin.
While I am still reviewing the limited amount of information, based on my review of both the code and the available data, the attack was successful partly due to the 30 second block time.
XC use's a 90 second block time.
I am reviewing the additional variables & Proof of Stake code involved in this attacked for any potential issues
2nd
The current REV2 test-release will be updated, additional data collected and then the final rev2 will be released
Dan
Perhaps you could look at Blackcoin's PoS ver 2.0? It is supposedly an improvement on the security of proof of stake's original design based on Sunny King's work. It's also open source and described in the white paper.
Blackcoin dev rat4 is one of the few solid coin devs around here.