Bitcoin slid below $84,000 on 7 October as oil prices jumped following attacks on Iranian tankers, a move that weighed on risk assets and triggered $547 million in crypto market liquidations.
The pullback interrupted a recovery that had been building since late August, when bitcoin first moved above the average cost basis of buyers who entered the market in 2026. According to Glassnode data cited by CoinDesk, that cohort holds an average cost basis of approximately $73,500 and has been in profit since the late-August rally.
The more immediate level to watch is the U.S. spot bitcoin ETF cost basis, which measures the average cost of deposits into the funds and stands at approximately $82,300. ETF investors only recently returned to profit for the first time this year, making this a potential support level if bitcoin falls further.
The oil-driven risk-off move came as geopolitical tensions escalated following the Iranian tanker attacks, with crude prices moving higher and injecting fresh uncertainty into a market that had been regaining its footing.