How can you create an alarming topic without enough proof? I expect that I will read some useful information or more context in your text, but you only say that someone's address is appearing if you are pasting your address in the blockchair. That's nonsense. What is your reason for suspecting that the website has been hacked? In fact, your problem is so simple; maybe you just copied the wrong address or there was just a glitch in the website that was not necessarily hacked. Next time, before creating such an alarming topic about accusations of some website being hacked, gather information and proof that it is being hacked, because spreading false information about something that you are not sure about is not good.
The Blockchair is just an explorer where we don't need our key to access the website. I don't know what our problem is if that explorer is being hacked?, even the explorer is hacked, it won't have any effect for our balance even we put the right address there. I just remembered long time ago, (but I forget a name a Explorer), I just bookmarked my address on that explorer, but some day when I checked my balance, Looks like there's a transaction which I didn't do so it made my balance going to empty, I bit panic at the time, and open my wallet imediatelly just to know what happen. evidently, my bitcoin is still there, there are no transactions whatsoever there are no transactions like those that occur in Explorer.
Explorer is just online site which could be an error. But we should not panic, because we don't use the private key to access the website. if there are errors and the website ask our key, don't give it, because no one asked the key except the scammer.
