I like your design best because of the overall symetry but I think you should work out this one more:
Maybe try to do it in white. It's sort of the connecting dot which should connect us all, a centralized idea in a decentralized world?
Maybe make the lines thinner for the black background version!
glad you like it.. and what should be in white? the inside is transparent, so it depends on the background. I wanted it to be responsive and simple, so thats why the lineas are clear. It can be in one color too without problems.. and thin lines.. imagine the logo really small.. if the lines are too slim they become invisible. you can see it on the logo above :)
