Trader 0x4321 has re-entered the Bitcoin market with a significant short position, according to Lookonchain monitoring. After incurring a $3.2 million loss from previous shorting activities, the trader has opened a 10x short position on 99 BTC, valued at $6.7 million. The position has a liquidation price set at $76,202.53, marking the trader's return to the market after a two-month hiatus.