Unfortunately it looks like someone found an exploit. If you look at the limited block explorer, which I did twice in the last days, you'll see a lot of users syncing 7 coins (max limit). I also saw tons of users sending 138 or 139 coins to the same user a couple of days ago. Its probably this user who is now dumping the coins. I didn't take a note of the user names, but for the devs who has full access to the transactions it should be very easy to check this. Could perhaps the devs also provide us with a plot of how many coins have been "mined" over time? I wouldn't be too surprised if there is a sudden jump some where. My guess is someone is running VM's and faking accelerometer, or found an even more efficient exploit. If I'm right, and the devs don't act on this quickly, this is probably the end of MCZ

edit: "end of MCZ" was a bit dramatic But I would make this less exploitable