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The principle of using the speed of light as a security mechanism is exactly how the https://proximum.xyz network operates: voting power is determined by the volume of space swept by each node, and nodes estimate relative location using a trustless time of flight measurement.

I like the idea of a basic XOR as the fastest possible response: could stream the response, so latency << 1 µs seems doable. That's enough spatial resolution for a lot of trust-minimized location use cases.

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