It turned out that a hacker sent a message using Vanity Address * 1 about the hacking of KuCoin, a major cryptocurrency exchange that occurred on September 26th.
From a suspicious address published by KuCoin, cryptocurrency media U.Today followed a transaction and read a message from the Vanity Address involved. The contents are as follows.
It's a large-scale hack. If you don't have a private key, you can't call it your own cryptocurrency.
Source: Blockchair
* 1 Vanity Address is a Bitcoin (BTC) address that starts with your favorite character string. It is often used for services and donations, but it can also be used by hackers to convey messages to victims and communities, as in this case.
KuCoin has published a total of three suspicious BTC addresses, and the other two are also involved in other Vanity Addresses, which appear to be messages addressed to nearby subjects.
KuCoin hacking
KuCoin first issued an official statement regarding the large withdrawal confirmed at 04:05:37 (UTC + 8) on the 26th of Japan time. He didn't use the term "hacked" at the time, but later said the CEO had been hacked at a video conference.
From subsequent investigations, the amount of damage this time is estimated to be equivalent to 200 million dollars (about 21.1 billion yen). The target brands are BTC, Ethereum (ETH), XRP (Ripple) and so on.
Following this hack, companies and communities are working to minimize damage. The main movements are summarized in the following article.
KuCoin is still updating information on hacking while continuing to respond to internal audits.