[1] https://twitter.com/MixinKernel/status/1706139175018529139
It is said that the incident occurred on September 23, 2023 and only today the founder of Mixin Network held a press conference at the media in Hong Kong time to reveal this problem occurred.
SlowMist as the blockchain security advisor will continue to own this case and they will provide updates.
[2] https://twitter.com/SlowMist_Team/status/1706133260869468503
It is very sad to see something like this to happen, specially when their service was so active here in bitcointalk community
On the other hand, we can see how custodial services are risky for both parts. The administration of Mixin is now responsible for third party funds that were lost, and the users who trusted them now lost their money.
I always say: keep your bitcoin in a hardware wallet. This is by far the most tested and the safest option