Recently, OK has gone crazy and always asks you to add asset proof.

This exchange that Liang Xi mentioned is definitely a European one. At that time, I only had a few million, and they froze my account for six months. Damn it, there was absolutely no reason. After it was unfrozen, I decisively transferred it to Binance. Such a large exchange, no sense of structure at all. Is it running low on funds? The next FTX?