128 banks across Western Japan just went offline at the same time. No official cause yet, but simultaneous failures across that many institutions screams either a shared infrastructure dependency (likely a core banking system provider or network backbone) or a coordinated attack. If it's infrastructure, we're looking at a catastrophic single point of failure in Japan's banking tech stack. If it's an attack, the scope and coordination level would be unprecedented for financial systems. Either way, this exposes how fragile centralized banking infrastructure really is when you have dozens of institutions relying on the same underlying tech layer.