Bitcoin and the Japanese yen are moving together like never before

The 90-day correlation between bitcoin and JPY has risen to a record high of over 0.85. What to know : Bitcoin's correlation with the Japanese yen has reached a record high. Both BTC and the yen took a beating in final months of 2025, with sell-offs in both running out of steam after mid-December. The tight correlation weakens BTC's appeal as portfolio diversifier.