How do you steal $6.4 billion without leaking a single private key? You hack the automated API that asks the key to sign. On October 29, hackers weaponized EIP-7702 to rewire a massive exchange hot wallet into a self-draining vacuum cleaner. But they couldn't touch sovereign Bitcoin cold storage for one simple reason: The 5-Inch Air Gap. Bitcoin's PSBT architecture forces you to physically verify transactions on an offline screen. A hacked laptop cannot bridge empty air.
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