Bitcoin just slept through Japan’s rate decision, but a swollen yen short is quietly threatening a massive margin call

Bitcoin's leverage gauges barely flinched after Friday's Bank of Japan decision. A yen short that had reached 152,125 contracts by July 21 grew to 163,412 by July 28, while Hajime Takata's failed push for 1.25% now gives traders a clear pressure point to watch.The board held the overnight rate near 1.0% by an 8-1 vote. Takata stood alone at 1.25%. The latest Commodity Futures Trading Commission report counted 101,271 non-commercial longs and 264,683 shorts as of July 28.The gap left speculators net short 163,412 contracts, 11,287 more than one week earlier. Longs fell by 6,319; shorts rose by 4,968.The CFTC calls these positions non-commercial, a catch-all label that keeps the funding story out of view. If traders race for the exit, the yen short could snap back like a released spring, lifting the currency and pressuring leveraged Bitcoin positions carried on the same books. Who is carrying both trades remains hidden.Bitcoin barely moves through the decisionUSD/JPY was little changed between the BOJ's reference-rate releases. Official BOJ reference rates ran 160.17 to 160.19 at 9 a.m. in Tokyo and 160.20 to 160.22 at 5 p.m. The full Tokyo session ranged from 159.39 to 160.90 and st...