This is something that keeps popping up in test games and I've been asked to get around to getting a ruling on this.

if a player has Destiny, and hacks their opponent's check with a turn ending hack (say forethought), can the other player counterhack their check with blood runs true (so failing will not end the turn) even with destiny out because of the general {Potential} for that blood runs true to be used against the player with destiny (ala- red lotus + amy's assistance when the player is 100% going for damage redux because of the potential to commit an asset {even if there is no asset})

Destiny reads "After your opponent plays an ability that gives one of your control checks a penalty, cancel that ability's effects."

If you're asking what I think you're asking then in this case the player with BRT is hacking his own CC, so Destiny would not take effect.

The only thing that Destiny stops is the opponent hacking your checks, as Chaoschild stated. Destiny does not stop:

You hacking your opponent's checks.

You hacking your own checks.

Your opponent hacking their own checks.

So yeah, that'd be perfectly fine for your opponent to hack their own check with BRT to avoid ending their turn.

Stamp. ........ .........