This is a joke. Nice try to spread FUD about other coins, rat4, to try and promote your pure PoS blackcoin. How is it that Blackcoin prevents attack forks as a pure PoS coin, again?
You say "a sequential chain of PoW blocks can be mined in a flash."
Which is not true. Sure, you could mine all of the PoW blocks that occur sequentially, but there will be many, many more PoS blocks that interrupt those far and few apart PoW blocks.
....
I think you should apologize now rat4, thank him and pay him
BIG bounty for helping Mintcoin and others for founding bugs...
And even bigger bounty for solving issue...
PS:He just mined 1h in POW Mintcoin you want more evidence... ? Do you want double spend ?