Non-HD wallets like Tidecoin if not backed up after sending coins to a address it's possible to not be available.........same thing happen to me, I burned 5,000 Coins the Wallet Seed Key regenerates around every 50 transactions ....it's part of Satoshi original design or something..........

If you use Windows it's possible hackers............


For me it happened after I sent some coins and re-installed hard drive OS.......most of the coins were there except that last transaction Coins Change Address


Could be Chi-Coms playing catch-up too...........using Operating System Backdoors.........NSA could do it but not likely


For the most part there are no "Hackers" in the world, they call all "State Actors" as "Hackers", all individual hackers end up in Prison...............