Isn't a geohash just a not-so-standard way of writing latitude/longitude?

Would be neat if there was a way to cryptographically prove you were somewhere...🤔

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Yep, the main point of Geohashes is that you can crop them in 1D to decrease resolution in 2D. It's actually quite cool.

It should be possible to keep the privacy aspect using some kind of zero knowledge proof too I think 🤔