[singpolyma3]

What? That's not true. You don't need more than one CPU miner online for tx to go through. That's why there are difficulty adjustments.

[nytesky]

But as number of miners drop arent btc at risk of a 50% attack?

[groundzeros2015]

But if you have anywhere near the market power to do a 50% attack, you can make a lot of money mining.