What actually happens when exchanges freeze wallets?

[Z-tight]

Overall, it's unfortunate that risk assessment, AML scoring, and similar practices have somewhat become acceptable, even here it seems. For me, they're a Trojan horse. The real purpose is control.

Yeah it is, i also consider it to be an attack on BTC's fungibility. When you introduce terms like 'clean' and 'dirty' BTC, then it is obvious what the motive actually is, because to bitcoiners, there is neither clean nor dirty BTC. BTC is BTC. However, i guess that is where we are right now with regulations, and things are probably bound to get worse. Developers are even getting jailed for creating open source, self custodial softwares, it is that crazy.

[NotATether]

The exchange does not really assess the risk itself. It's the compliance tools they use that does that for them.

Here's a example from ChainAnlysis software to give you an idea:

https://www.chainalysis.com/product/kyt/
https://www.chainalysis.com/solution/crypto-compliance/

So as you can see above, these solutions would easily tell them (in real time) if the transaction is coming from a high risk non KYC exchange, a mixer, a darknet marketplace, a gambling site, connected to terrorist groups, etc.

It's then up to the exchange to decide what to do (investigate it further assigning a compliance officer to your case and asking you for more details, let it go, decide to no longer serve you but let you withdraw, etc.)

BitMixList can do that at a fraction of the price 🙂

https://bitmixlist.org/aml-check.html

[Findingnemo]

In worst case scenario, they do it to themselves, which means they will just stop all the withdrawals when there is hack or an attempt to investigate further but usually they do that when they suspect that you are trading with the funds that is related to illegal activities and then exchange will freeze then ask for the source of funds.

[davis196]

In many cases the confusing part is not the freeze itself, but what actually happens after it starts — how exchanges assess risk, what triggers deeper investigations, and why responses can take so long.

1.How exchanges access risk? There's no risk for the crypto exchange. You have to elaborate more on what do you mean by "how exchanges access risk". The risk is for the users only. Imagine having crypto blocked in your account while the crypto prices crash and you can't sell your crypto at a higher price, because your account is frozen.
2.Suspicious transactions are what triggers deeper investigations. The forum members have already mentioned all the potential suspicious transactions. I don't want to get into detail about this, it's self-explanatory.
3.Responses take too long because most crypto exchanges don't have big enough customer support teams or big enough investigation teams.

[hugeblack]

A few months back Binance had frozen my account. First of all, they suspect incoming transactions, then flag my account. Most probably they have some tools to detect suspicious transactions; when their system flags an account, then they move forward for manual review. It's about transaction issues; they might freeze the account for some other reasons as well, like security issues or legal issues.

The funny thing is, instead of freezing the transaction, they freeze the entire account, meaning they close the whole account and request information related to a single transaction.
Therefore, even frozen accounts aren't handed over to the authorities; instead, they become "part of their hot wallet."

[UmerIdrees]

This is a very important topic to discuss, as it is very common nowadays and can happen to anyone at any time. Your funds are frozen, and you are left only with the silence, the silence of your approach to the exchange, where there is no clear answer from them and no idea of what to do. This is the worst thing about it.

I am glad, and I thank you for sharing this link here. I am sure a lot of users will benefit from it. This is very necessary for everyone, as even if they haven't faced any such issues, they may need it in the future so that they have a clear picture of what to do and how to get back their funds..

Well, to the OP's question about what happens when the exchange freezes the wallet, well, if he is talking about the money in that wallet, then that becomes the custody of the exchange in case they never unfreeze the account and keep the money with themselves forever. That is another way of scamming people, and therefore, one should be selective and careful in depositing money in centralised places, including exchanges or any service providers.