One of the discussions about the coin and a important feature is immutability. Bitcoin's immutability is based on the idea that unless someone has 51% of the hash power, the fact that it would be very expensive to do that, the network is presumed safe. However if China for instance decided they wanted to take over the bitcoin network, they have enough funds to do so. They would just need to start hashing more than the entire bitcoin network, put in their own transactions, and once they surpassed the bitcoin network all of the nodes would switch to their network. It seems that proof of stake is a better model, in that those who posses the coin have a stake in it, and unless an attacker were to come along, they would have to purchase more coins than all others to control it, but that would be working against their own self interest to do harm to the network.
So I think the best way to secure the network in my opinion is time. Things that happened yesterday cannot be changed (unless they invent time travel), so then you use time as your consensus model.
Each block that is recorded at midnight is locked and cannot be undone. If a transaction failed to make it in the previous day, it would then be added on the following day.
Another important feature of the coin is that it encourages people to hold on to it. During the 80s the average mutual fund earned 30 to 35% annually. I wanted a coin that would pay 30% annually but compounded monthly. I initially said daily in my whitepaper, but after some discussion I think it would be better to make the user wait a month to receive their proof of stake in order to encourage holding (HODL) their coins.
As an investment vehicle cronas coins could be used by institutions or companies in 401k plans, IRAs etc. This is how the coin will maintain value, by investors.