"Stack sensing with privacy-by-design to gain safety without surveillance Vitalik Buterin described a concrete project where air-quality sensors collect data, then locally apply differential privacy and fully homomorphic encryption so that a server can compute aggregate health insights "without being able to see any input from any individual person." He framed this as proof that the tradeoff between safety and privacy is not inevitable: "we can deliver the higher levels of safety but at the same time protect people's privacy." The broader design principle is that whenever a new sensing or data-collection system is being built, privacy-preserving computation (FHE, differential privacy, zero-knowledge proofs) should be specified as a first-class requirement at the architecture stage, not added as an afterthought. Source: Vitalik Buterin, Tech Panel Discussion, EAC vs DACK"