To see last block. It mined by our "bad miners" group? If yes, we mine next block based on
last block. If no: we ignore this block and mine on last block from our group...
This is attack-51 by the definition
Is it realistic scenario? I think yes and it can happen right now.
Yes, it is realistic. But they do not need to cenzor blockchain and orphan others blocks,
because this will not give them a profit. More realistic scenario is building hidden chain of blocks
and publish them after some time for doublespending purposes.
Your opinions? I would like to hear the opinion of Bitcoin Core developers.
