Still trying to find a solution too here.
People say both the keys & diamonds are server-sided, yet somehow the diamonds never run out in the modded versions and the keys stays normal. Some time ago there used to be mod apks where the mod is making you play as a VIP so you get unlimited keys & diamonds. Sadly now there aren't any available which makes me believe the game devs change something that makes it impossible to make a vip account mod.
BUT I don't think that the key/diamond rewards you get for watching the daily ads are server-sided (could be wrong tho). I've been trying to hack the value of the reward from watching the ad instead of just getting one key, but to no avail, since I'm not too experienced.
I used the exact same technique to hack a game called FR Legends, where I change the reward for watching an ad and it was so easy I never failed. But on this game, dang it's hard. I will give you an update if anything works though.
