Sorry for your brother's loss, I know how he feels because I was in a similar situation in the past where my computer was hacked and my bitcoin wallet was stolen, I learned a hard lesson firstly do not store any coins on a computer connected to the internet and secondly do not download any files from the internet.

Unfortunately your brother cannot get his coins back and I also do not think OKX exchange will respond to the request to freeze the hacker's account unless it is through the competent authorities by filing an official complaint, because the hacker can simply claim that he got this money legitimately and there is no evidence that he is lying.

If it were you, how would you start the conversation and what evidence would you give them to believe that it is your bitcoin and you are not trying to scam them or their customers? They are a centralized exchange and they have all the information about their users but they will prioritize protecting their customers first instead of easily believing what a stranger like you presents. Centralized exchanges have their own rules of operation, they will not easily believe what we say even if we have proof.

Instead, I wonder why you and he didn't think to report it to the police when they were the ones responsible for this problem. I think the only person who can ask OKX to freeze the hacker's account is the police, otherwise no one can ask OKX to provide customer information and can freeze their customers' assets.

I also know how it feels losing money in this current economy when things are even more difficult no matter how little the money might be you will definitely feel the pain of losing it. Wow seen your story together with that of op is just annoying, so all we can do is to be very careful with how we leave our gadgets and how we expose them, imagine carrying my laptop and hacking them is very dangerous because you can even lose more than your money most vital informations kept on my laptop while, it's been hacked. And sometimes it might not even be anything but the extensions of keeping things in that wallet put everything at risk.

Most of this exchanges are not really bothered what happened to your assets, and reporting such cases might not even make any difference so the best thing is to avoid connnecting anything online, we just have to avoid everything as possible, if they should know that you have cash with you then you will become a target for them been careful with the kind of information you share is very possible that they might use it against you by making you their prey.

Things do not work like that i'm afraid, an exchange is not going to block a customer's account because an individual made a complaint, that would never happen and they will probably not reply your message to them. If you want action from an exchange, it has to be through authorities, such as law enforcement or the government itself, and getting them to make that effort is very difficult, except it is a high-profile case.

Tether can do nothing if the money is already on exchange the best way for him right now is try contact the OKX customer service and describe anything with the data and etc. Tho it is still possible if the hacker don't already cashout the money or move the money to other wallet.

Since hacker are clever maybe he bought kyc okx account from someone but you need to try it tho

That's right. It is very unlikely that our assets will be returned. Even if we contact OKEx customer service, they will not respond quickly, it takes a lot of time to search while we know that hackers are generally not stupid, they are smart after hacking they will definitely move all their assets to another wallet or sell them. So any hacked assets are impossible to return or can be frozen.

That is why every trader or investor is very important to keep their wallet safe, never click on anything suspicious either via email or other media. Because it will be risky for your wallet which can be easily hacked. The problem of crypto hackers does not happen once or twice, even almost every year there is news about crypto hacks. So make the news a lesson for all of us to be able to protect our assets as best as possible. Guard your wallet like you guard your wife from bad people.

Theter can freeze funds.China recommend not use usdt because of this.

None of them can freeze hackers' accounts unless directed or requested by law enforcement. Based on the request of a regular user only and if the amount has nothing to do with money laundering or terrorism then freezing the amount will be more difficult no matter how much evidence you provide.

OP's brother stores his assets in his personal wallet and on his computer, which means he has nothing to do with OKX. How could they easily believe what he said based on just the few pieces of evidence he presented? If I were an OKX employee, I would ask him again why he didn't report it to law enforcement?

Actually admitting to such hacks or recovering the stolen money is often complicated. But even if it is complicated, if one tries, he can get positive or negative result.

The first step in this complicated task would be to lodge a complaint within shortest possible of time with the exchange platform where the assets have been transferred. Must provide detailed information while filing complaint. If details can be sent to that exchange platform with all the information including transaction ID, wallet address if the authority of that platform can send a message. Then you can take further action according to the message. If a major hack is organized then legal action must be taken but whatever is done must be done quickly otherwise the hackers will be able to withdraw the assets.

Since these types of hacking are often organized, it is better to secure your wallet. When the amount of resources is large, it must be stored on a separate air gaped device. Besides, if all the assets are kept in different wallets instead of in one wallet, the risk will also be reduced. Don't focus only on earning assets but also on storing it otherwise chances of getting hacked will increase.

While I agree that they can't take the money from the hacker and give it to OP, they can definitely freeze if there is any proof provided, until it's cleared. I have seen this happen before, all you have to do is just talk to your own lawyer, tell him to open an appeal, as in just first part of the sue process, without even going to court, just basically a piece of paper and when that happens, you also send a copy to it to OKX or any exchange, any proper exchange would freeze the account until the court decides on what is going to happen, which will not be a bad idea in this case if OP could do.

All of this starts with contacting a lawyer, without a lawyer you are not going to be able to do anything, after the lawyer part, lawyer will handle the court side of things, but then you can handle the exchange part as well. Not that there will be any results because we will see 99.99% of the time hacker is from another nation and won't care, and nobody in your country would are neither.