Quote from: kodtycoon on November 07, 2014, 06:23:07 PM

Quote from: phillipsjk on November 07, 2014, 06:18:36 PM

You can't mathematically prove it, because the other stake-holders can roll back to any point of time of their choosing.

In other words, PoS does not actually form a consensus.

that does not mathematical proof is impossible. also the nxt blockchain cannot be rolled back past 12 hours. for any reason. so instantly you have proven you do not understand the tech and that you do not know how PoS actually works. the white paper and the "math of nxt forging paper" prove that what you are saying is not true..

what you say could be true for other variants of PoS but it does not have a leg to stand on when discussing nxt.

Quote from: andytoshi on November 01, 2014, 07:05:10 PM

Quote

andytoshi, what do you think about saving PoS by bouncing checkpoints/blockhashes off reality?

Then you are introducing trust assumptions and new attack vectors. There are no universally trusted parties to provide checkpoints.

Quote from: andytoshi on October 31, 2014, 01:52:50 AM

It's worth noting that by writing a well-defined security model and working toward it, it is possible to create a "working" PoS which is only broken when the assumptions of the security model are violated. If one were to do this, it would then be easy to point out how the security model is not applicable to the real world. But Vitalik's posts --- and no PoS writeups that I'm aware of --- actually do this.

http://en.wikipedia.org/wiki/Security_through_obscurity
https://download.wpsoftware.net/bitcoin/pos.pdf