Bitcoin Under Seventy-Five Thousand, DeFi Bleeds Thirteen Billion, and Iran Rattles Markets

April 20th, 2026 market briefing: Bitcoin holding near seventy-five thousand dollars as geopolitical tensions resurface with Iran closing the Strait of Hormuz again. DeFi ecosystem hemorrhages thirteen billion dollars in total value locked following the two hundred ninety-two million dollar KelpDAO exploit-Aave alone dropped eight point five billion. U.S.-Iran ceasefire expires mid-week with oil spiking above ninety-five dollars per barrel. MicroStrategy adds thirty-four thousand bitcoin for two point five four billion while crypto ETF inflows hit nearly one billion weekly. AAVE token down twenty percent from the hack fallout. Covering crypto market technicals, DeFi contagion risks, institutional flows, options expiry pressure, and cross-asset volatility as markets brace for Wednesday's ceasefire deadline.