Bitcoin fell to its lowest level in more than three weeks on Friday, as traders turned increasingly defensive following the year's largest options expiry and a broader risk-off shift across global markets. The world's largest cryptocurrency dropped as much as 5% to $65,547, slipping below the $66,000 mark and extending recent weakness. The move comes as Bitcoin remains range-bound between roughly $60,000 and $75,000 in recent weeks, well below its October 2025 peak of around $126,000. The latest decline coincided with falling US stocks and rising oil prices, as investors grappled with geopolitical uncertainty tied to the Iran conflict and its implications for inflation and growth.