Update: Regarding the ownership of this address, MLM (@mlmabc) speculates it might be related to the mysterious whale that previously made a high-profile swap from BTC to ETH. The reason is that this whale used a trading terminal to execute transactions via TWAP at the time. When Hyperliquid created API keys for such terminals, they were sequentially named from 'account1' to 'account9' before stopping. This time, however, the API key is named 'account10,' which seems to continue the sequence. Attaching everything here for your reference.