Bro, much better if you start spending your Survival Trial points on buying some ninja fragments, then Refine Fragments it, and have some seal scrolls .. But if you really want to continue saving up the points/coins you have, then my advice to you is to get a screenshot of your coins everyday, make sure the date/time-stamp is visible so in case that your worries became real, then you have atleast a proof that you once have that number of coins before the changes happened.