Bitcoin faces renewed headwinds from Treasury yield pressure following a record quarterly exodus of capital from Japanese investors, who sold $29.6 billion of US government, agency, and local authority debt in the first quarter. This represents the largest net sale volume since the second quarter of 2022, driven by an abrupt shift in Federal Reserve rate expectations triggered by surging oil prices that rendered existing Treasury positions less attractive. Data compiled by Woofun AI indicates that the 10-year Japanese government bond yield climbed above 2.6%, reaching its highest level since 1997, while the 30-year yield hit 4% as markets priced in an imminent Bank of Japan rate hike. The BOJ simultaneously reduced its monthly JGB purchases from ¥5.7 trillion in August 2024 to ¥2.9 trillion in the first quarter of 2026, effectively removing the artificial ceiling that had suppressed domestic yields near zero for years. When the Bank of Japan previously pushed Japanese yields to near zero, institutions were forced to seek income abroad, causing US Treasuries to absorb massive inflows of capital. Mortgage rates, corporate borrowing costs, bank balance sheets, collateral markets, and emerging-market debt all key off Treasury yields; consequently, when external demand weakens, the market must offer higher yields to clear supply, a tightening dynamic that flows through every corner of global finance. Although the Bank of Japan kept its short-term policy rate at 0.75% in April, three of nine board members voted for a hike, and the BOJ raised its FY2026 core inflation outlook to 2.8%. If the BOJ hikes further, domestic JGBs become increasingly attractive, strengthening the logic for capital repatriation. Woofun AI notes that the central market question now hinges on whether higher risk-free returns will cap BTC upside before sovereign-debt stress strengthens its long-term case, as a 30-year Treasury yielding 5% competes directly with every dollar allocated to Bitcoin. As of May 17, BTC traded near the $78,000 zone and failed to close above its 200-day moving average of $82,228 on five consecutive attempts. If Japanese selling adds sustained upward momentum to Treasury yields, Bitcoin faces a triple threat: higher yields pulling capital toward bonds, a stronger dollar compressing risk assets globally, and liquidity conditions that drove the 2024-2025 rally reversing course. Conversely, if Japanese selling, climbing JGB yields, and broader G7 bond market weakness signal a visible deterioration in foreign demand for US sovereign debt, Bitcoin's macro narrative strengthens significantly. The same Japanese repatriation that tightens short-term liquidity also removes a pillar that suppressed global borrowing costs for decades, and as that pillar weakens, the macro backdrop for Bitcoin's outside money thesis builds further. Woofun AI analysis suggests that Treasury yield stress compressing Bitcoin's short-term price action and sovereign-debt weakness building its longer-term macro case have coexisted across every major rate cycle where Bitcoin matured as a macro asset. Japan still holds more Treasuries than any other foreign investor but has become a marginal seller in a market where $18 trillion in new sovereign supply will need buyers in 2026. For Bitcoin, this dynamic establishes Treasury yields as the near-term pressure point and sovereign-debt fragility as the longer-term argument.