Malk0lm:
It's not so much about mistrust, I do trust the players. However, even with the time stamp, since the rolls can be done whenever, I'm not sure that I can tie any roll to any particular post outside of the memo or text. Two rolls with the same memo could be done in any particular order. I'm not sure that's important, but crossing the provenance like that at least gives me pause.
Assuming you have your game's dice roller set so the rolls are public (you can set it as default so rolls are private and just the person rolling and the GM can see them) you'll end up generating something like this in the dice roller log (which is located below the dice roller interface when people click the "dice roller" link in a game).
12:47, Thu 14 Aug 2014: Tom Bronson rolled 5 using 1d6. Control roll 4+.
22:55, Wed 13 Aug 2014: Frank Reeve rolled 5 using 2d6-1. Control Roll, Crash Table 1.
22:48, Wed 13 Aug 2014: Frank Reeve rolled 1 using 1d6. Control Roll.
22:09, Tue 12 Aug 2014: Tom Bronson rolled 7 using 2d6. Heavy rocket.
20:11, Tue 12 Aug 2014: Luke Burbank rolled 4 using 1d6. Control Roll.
23:31, Mon 11 Aug 2014: Jake Clanton rolled 3 using 2d6. Ignition via optional fire rules (4-).
23:30, Mon 11 Aug 2014: Jake Clanton rolled 4 using 1d6. FT Damage.
23:29, Mon 11 Aug 2014: Jake Clanton rolled 8 using 2d6-1. Flamethrower.
It is up to the player to put the note at the end, saying what the roll is for. In this instance things like "FT Damage" and "Control Roll" are notes inserted by the player.
It is then customary for players to copy & paste the line into the bottoms of their posts, sometimes in a specific color to make it stand out.
So a post in a game from the character Jake Clanton might look like:
Jake lined up and triggered his flamethrower.
23:30, Mon 11 Aug 2014: Jake Clanton rolled 4 using 1d6. FT Damage.
23:29, Mon 11 Aug 2014: Jake Clanton rolled 8 using 2d6-1. Flamethrower.
It's then pretty easy to just click over to the Dice Roller and see that Jake only rolled once to attack and once to check the damage for his Flamethrower. Obviously if there's a bunch of the same rolls by Jake, then there's an issue. But players have no way of erasing the dice roller log, and no way of making a roll and
not having it be recorded.
So there's no way to really cheat without the GM and, if rolls are done publicly, the rest of the players noticing.
Is it as easy as coding in dice rolls into the post itself? Maybe not, but it's the way things are set up so the user base has established certain methodologies and levels of trust to make it work.