I think it would be a good idea to open a thread in this section for important technical issues of PPC.
One of these issues is the checkpoint system, which is one of the main problems pointed out by critics of PPCoin. They will be phased out later this year as Sunny King posted today on Bitcointalk in the last weekly update:
Recently we have seen intermittent 51% attack on feathercoin network and other new cryptocurrency networks. This was one of the top reasons that ppcoin's checkpoint system was originally designed. The recent attack on feathercoin network indicates that the attacker is quite resourceful, controlling maybe upward of 2gh/s scrypt mining (meaning thousands of highend GPUs). [b]The phaseout of ppc's checkpoint is planned for later this year but will be gradual. Eventually the checkpoint would become user enabled and by default not enforced. In this running mode, the checkpoint system still acts as a safety mechanism that can be utilized via community consensus in the event of persistent 51% attack on proof-of-stake or other emergencies.[/b]
I think it is a good idea to make the checkpoints voluntary and was glad to hear of this news, but I am not a techie . I am fully aware that the phasing-out of this checkpoints depends on the security of the actual Proof-of-Stake design.
Would be interesting to hear some opinions here.