Bitcoin heads for 4% October loss as $80,000 support looks fragile

• —BTC is down roughly 4% in October, a second straight year without an 'Uptober'
• —The slide to $79,145 liquidated almost $150 million in long positions
• —Markets price over 90% odds the Fed holds rates at 3.75–4%
• —Brent crude trades near $110 a barrel; KOSPI fell 1.5% to 5,469