The blockchain gives us consensus on time. But how do we achieve consensus on place? At Kernel's NYC salon, @0xranvir – co-founder of @witnesschain with a Ph.D. in distributed systems – laid out Proof of Location: a protocol for bringing consensus to the physical world. The challenge: GPS can be spoofed. IPs can be faked. Local beacons can be corrupted. The solution: Active measurements across a global network of watchtowers. Here's how it works: ► Nodes ping the prover and one another ► Robust matrix completion filters malicious challengers and calculates Internet geometry ► Triangulation determines verifiable location Once you have consensus on where and when, you can snapshot the physical world: an "EVM state of the globe." The implications are compelling: verifiable news, infrastructure deployment, place-gated currencies.