A report by Oxfam reveals that the untaxed wealth hidden in offshore tax havens by the richest 0.1% surpasses the collective assets of 4.1 billion people. Despite the Panama Papers leak a decade ago, the ultra-rich continue to evade taxes using complex financial systems. Oxfam urges the introduction of wealth taxes to address global poverty and inequality, while highlighting the challenges faced by developing nations in accessing tax information. The report also discusses the need for a global asset registry and increased transparency to combat tax evasion.