I saw a sentence in the trading group: @ dYdX DYdX v4.0 has been updated, Reduce only is finally here! ” My first reaction: Isn't this just a small feature? What's the big use? Today, I almost lost my position because I didn't activate this feature. The situation is as follows: I usually like to place conditional orders when trading. Last night, I placed a stop loss order with the intention of taking a short position after the stop loss. However, before going to bed, I forgot to cancel the previous limit order. If it weren't for the Reduce only of dYdX v4.0 stopping me, my empty position would have been directly backloaded, and an instant liquidation warning would have arrived. At that moment, I realized that this thing was not a small function, it was a life-saving button. I have seen my friend being cheated by a cross chain coin withdrawal vulnerability before, and their funds were instantly drained. This time, the IBC withdrawal limit on dYdX has been increased by hours and days, and even the sub account negative collateral has been directly frozen for withdrawal. It may sound verbose, but to be honest, this set of security measures is like a "sleeping pill" for traders, so they don't have to worry about being killed by system bugs every day. In the past, many people were too lazy to pay attention to DAO voting, resulting in MEV validators pulling wool every day. V4.0 directly installed on the x/govplus module, what if you do something wrong? Token holders will directly punish you. In addition, with the account authorization function, voting and re voting can be easily handed over to others with just one click. Even someone like me, who is a lazy governance person, couldn't help but cast a few votes. V4.0 is not about adding features, but upgrading dYdX from a "pure trading platform" to a safer and more autonomous derivatives ecosystem. Previously, you thought trading was a 'war between yourself and the market', Now, with Reduce only and IBC limits x/govplus， You have a few more life-saving teammates. Brothers, remember to try the Reduce only feature and don't regret it when your position is liquidated.