30 years of changes in the Japanese bond market: was Bitcoin a safe haven or a trap before the September rate hike?

According to Woofun AI, domestic borrowing costs in Japan have reached an all-time high since 1996, marking a fundamental reversal in the country's macro-pattern of long-term reliance on negative interest rates to counter deflation. On the morning of the same day, the 30-year Treasury yield climbed to 4.185%, and the 10-year Treasury yield was 2.945%.

However, in stark contrast to the sharp shock in the bond market, Bitcoin soared 22% in the past week and reached the $80,000 mark for the first time since May. This abnormal divergence between crypto assets and traditional macro risk indicators forms the core contradiction in the current market: against the backdrop of increasing turmoil in the Japanese bond market, is Bitcoin actually showing true safe-haven properties, or is it false prosperity before the storm hits?

The breakdown of arbitrage trading logic is a key variable in understanding this contradiction. Over the past few years, yen arbitrage trading has been an important engine driving the rise of global risk assets. Its core mechanism is for investors to borrow low-cost yen, exchange it for US dollars, and then buy high-return assets. The amount of Japanese yen loans received by offshore non-banking institutions is about 250 billion US dollars. If a broader statistical approach is used, this leverage can reach 500 billion US dollars. This huge amount of capital is based on the premise that “Japan's interest rates will remain close to zero for a long time,” and the current reality has completely overturned this assumption.

In June, the Bank of Japan raised the policy interest rate to 1.0%, a 31-year high. The market generally expects that the central bank will raise interest rates again during the interest rate meeting on September 17-18. Japan's unique monetary environment over the past 30 years is collapsing. The 2.88% yield on 10-year treasury bonds is not a cold figure, but a sign of potential risk. Once the yen appreciates rapidly, the arbitrage trading position will instantly change from profit to loss. Goldman Sachs (GS.US)'s Praneet Shah points out that small fluctuations in the exchange rate alone are enough to eat up the entire annualized return of a position.

A similar scenario occurred in August 2024: Affected by the appreciation of the yen, Bitcoin plummeted from about $6,4600 to $49,000 on August 5, and the Tokyo Tokyo Stock Price Index (TOPIX) plummeted 12% in a single trading day. However, the situation has changed. This month, the yen took back more than half of the increase brought about by exchange rate intervention. Currently, it is weakening, and the exchange rate against the US dollar is about 159. The weakening of the yen has once again increased the appeal of arbitrage trading, so the Bank of Japan's subsequent policy trends on the yen are worth being highly vigilant about.

A deeper dilemma lies in the debt cliff facing Japan. At the end of June, Japan's treasury bonds reached a record high, reaching 1,346 trillion yen (equivalent to 9.1 trillion US dollars). The Japanese government expects the debt to rise further to 1,492 trillion yen at the end of this fiscal year. Prime Minister Sanae Takaichi announced that from April 2027, the consumption tax will be reduced to 1% for a period of two years. This move will increase the fiscal gap by 5 trillion yen. This creates a difficult dilemma: Japan needs higher interest rates to stabilize the yen and curb inflation, but interest rate hikes will greatly increase the pressure to pay interest on huge treasury bonds.

The Bank of Japan announced that it will slow down the pace of debt contraction from April 2027, which indicates that the policy prioritizes ensuring market stability rather than pursuing rapid normalization of monetary policy. Even so, the bond market has clearly shown a lack of confidence. To support the exchange rate intervention in August, Japan sold off some US Treasury bonds. In June, US debt holdings were reduced by 26.4 billion US dollars, and total holdings fell to 1.117 trillion US dollars. This is the largest monthly reduction in holdings among countries in the world, directly driving the US 10-year Treasury yield to 4.74%. Debt pressure is not unique to Japan; behind this is a major trend in global debt restructuring, and one of the sources of conflict is in the US.

Data compiled by Woofun AI shows that this cross-border debt linkage effect is reshaping the underlying logic of global liquidity.

In the midst of macroeconomic turmoil, Bitcoin was almost unaffected, and the price stabilized above $78,700. This resilience challenges the traditional logic of 'risk appetition'. The logic of the pessimistic scenario is clear: if the Bank of Japan raises interest rates drastically, the yen strengthens, and arbitrage transactions concentrate on closing positions, it will trigger deleveraging of global risk assets. In the August 2024 sell-off wave, Bitcoin was highly linked to Japanese stocks, proving that it was impossible to stay out of the situation.

Furthermore, in terms of yield in Japan, returns on interest-bearing assets have increased. In contrast, the appeal of Bitcoin, which does not generate interest on its own, will decrease. However, the optimistic scenario offers another possibility: if the yen continues to depreciate, Bitcoin will become an attractive safe haven for Japanese investors. This is not a pure theoretical deduction. Ray Dalio believes that Japan's debt situation supports the allocation value of Bitcoin. He suggests allocating Bitcoin in small proportions and allocating 10-15% of assets to gold. The participation of Japanese institutions also continues to increase. For example, Laser Digital, a crypto subsidiary under Nomura (NMR.US), has obtained Japan's first new crypto trading platform license in four years. According to the Nomura (NMR.US) survey, 79% of respondents plan to invest in Bitcoin within the next three years. At the regulatory level, Japan's revised Financial Instruments and Exchange Law has reclassified cryptocurrencies as financial products, which is expected to drive the implementation of spot crypto ETFs in 2027, with independent tax rules. The Japanese trading platform group is likely to launch a crypto spot ETF as early as 2027, and the clarification of the regulatory framework is progressing simultaneously with the accumulation of macroeconomic pressure.

The interest rate meeting of September 17-18 will be a key policy shift window. Most institutions expect interest rates to be raised to 1.25%. The bond market will be fully valued, but Bitcoin may not be fully digested. What is really worth being wary of is not the interest rate hike itself, but rather the central bank's statement on future policy restrictions.

If the Bank of Japan sends a signal indicating that 1% is only a transition phase towards a 2% interest rate, the yen will strengthen rapidly, and arbitrage trading will usher in large-scale liquidation. Conversely, if the statement shows that concerns about debt sustainability will limit room for interest rate hikes, and the yen will weaken further, Bitcoin is expected to benefit from a weak dollar and local purchases in Japan. The yield level in 1996 should be used as a risk warning signal rather than a market driver. What really dominates the market is the direction of the yen, not a specific exchange rate figure. The yen is currently depreciating and Bitcoin is rising. Once the Bank of Japan meeting in September changes mainstream market expectations, this correlation may suddenly reverse. The mainstream pricing in the current market is: Japan's debt problem will slowly evolve, and there will be no sudden collapse or collapse. Instead of waiting for the arbitrage transaction to reverse, Bitcoin investors are already expecting the yen to weaken and institutional capital to continue to enter the market. There is a possibility that this logic holds true, but it still needs to be viewed carefully in light of the historical rules of interest rates in Japan. For the first time in three decades, the yield on 30-year treasury bonds is approaching 4%, which is bound to have a profound impact on the market.