Bitcoin Holds $80,800 as Geopolitical Flare-Up Drags Crypto and Equities Lower

Bitcoin slipped roughly 1% to $80,800 on Tuesday while ether shed 2% to $2,290, as rising geopolitical tensions pushed Brent crude to $107 per barrel and lifted the U.S. Dollar Index 0.4%. President Trump's warning that a U.S.-Iran ceasefire was "on massive life support" rattled equity futures alongside crypto, with CoinDesk's DeFi Select Index and Computing Select Index leading sector losses at -2.7% and -2.3% respectively.

Bitcoin is still holding above the $76,000 level that Bitmine Chairman Tom Lee has flagged as the bull-market line in the sand — a close below that figure at month-end would, in his framework, confirm a trend reversal. Derivatives positioning is mixed: market-wide crypto futures open interest rose to $125 billion even as 24-hour volumes fell 6% to $174 million, pointing to gradual repositioning rather than aggressive speculation. Bitcoin's 30-day implied volatility…