[Help] Reveal a hidden GM roll later?

Hi there! Is it possible to announce a hidden roll, make it so it's only visible to the GM, and then reveal it later ? Example: A player is unsure if his character can trust a certain NPC and wants to roll Sense Motive. I'd like to make a secret roll, see the result as a GM, but only reveal it later (i.e. if the PC rolled poorly and the NPC betrays the party, I'd like to show the original secret roll to the players). The core of the issue is that I'd like to be accountable, so there is no fear of fudging. (In real life, I use a dice cup, take a peek, and later lift it.)

Screenshots are your only option.  You would probably want to be sure you have the date/time stamp turned on and possibly output some context in chat around it. /emas "@{selected|character_name}" sizes up the npc. /w gm [[ some roll ]]

Thank you for the swift answer and the workaround!