Iv been playing hearthstone a number of years on and off, i recently returned again and have been thoroughly enjoying the game again which is great! (However).
I have noticed that it seems the old disconnect hack is still in play where certain players will not have a hand they want or they are losing and then all of a sudden you get disconnected (sprites at play), so you reconnect and guess what? Their board is full of cards, theyr all buffed up and your board is empty, infact just now, first game this morning i ran into one. Disconnected me twice because i got back ontop the first disconnect. Second time i got disconnected i came back and watched them spam buffing the hell out of one card spamming libram of wisdom.
Now im not being funny but i would have thought after all these years this would have been dealt with and the clear backdoor for disconnects closed. Iv took a screenshot of the player name and their ID incase anybody wants it?
I reported as hacking as iv done with the others iv witnessed doing it .
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The reporting feature for “hacking” is nothing but a placebo button. I don’t think any of them are used for anything other than to mitigate players making tickets.
There are known situtations which can cause the game client to desync. In these situations you don’t disconnect, but get stuck in an endless turn. The game proceeds and the opponent keeps playing, but you see nothing and your client never recovers. You must force close the game and restart. If you are fast the re-login period takes less than your full turn. The problem is race condition netcode that needs to be fixed, but they already decided not to fix the structural problems in the game and just milk whatever they can before it dies.
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I rarely meet with DC hackers fortunately, but when that happens the point is to close the game rightaway with Alt + F4 and restart it, then you can avoid losing a turn. It’s usually working for me, not losing because of this. Just make sure to relize when you got DC-ed… Animations stop or doing unusual things like weird effects. When my opponent is try to rope me I use a stop watch to measure it’s time, every round is 75 seconds. If the rope not start to burn in time… you got DC-ed for sure. When my enemy realize his DC hack won’t work on me… it is conceding usually. 
However the game is full of bugs lately which are causing DC too… so your DC is not always the enemies fault. Good luck!
Hearthstone uses a server-client architecture, so it’s impossible for any player to “hack” and give you disconnects without causing the entire server to experience issues. The game does not connect players to other players, but to the server, which does its own logic with the game. Being out of sync is a recurring issue. A hacker cannot pinpoint any specific player with it without causing a global desync that would also crash the hackers game.
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As I understand it, emotes and other such cosmetic actions (card hover, targeting arrows, etc) are transmitted through a direct connection to the opponent.