The security issues of oracles and data sources have once again been brought to the forefront.

Vitalik Buterin pointed out on X that recent incidents where weather sensors at Paris Airport were interfered with, affecting prediction market outcomes, reveal a core problem: relying on a single data source makes it very easy to become an attack vector.
He suggests that for data-driven prediction markets, at least three independent data sources should be introduced, and a "median mechanism" should be used as the final reference value to reduce the risk of manipulation or single-point distortion.
This view essentially highlights the fundamental contradiction in Web3 oracle design:
Finding a balance between "decentralized data input" and "resistance to manipulation."
When real-world data begins to directly influence on-chain settlement logic, the data itself becomes a target for attacks, not just an information source.
Multi-source verification + median aggregation are becoming the foundational paradigm closer to "attack-resistant design."
The upgrade of such mechanisms essentially adds a "real-world firewall" to on-chain financial systems.
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