# Universal Location Proofs Technically it is extremely difficult (if not impossible) to create a definitive proof that some information was created at a specific physical location. There are technical ways to improve trust in the position - signing position captured by the sensor triangulating with the GPS or FOAM network in a secure enclave, for example. It would require a special app or - eventually - a plugin for mobile crypto wallets that allows users to generate the “universal location check-ins” (credit @jabyl from Distributed Town for his help thinking this through). Additional layers of trust could be built on a location by incorporating other sensor readings (like from a camera or microphone), as could requiring users to scan a cycling QR code only available at the location, form social check-ins in which they verify that the others were present, etc. We’ve been doing some early thinking about zero-knowledge location proofs as well, which prove that a point is inside a polygon without revealing the user’s position. This could then be verified on chain, enabling location-based smart contracts that preserve the user's privacy. Applications include local currencies, intelligent mobility systems, dynamic game preserves, detecting illegal and unregulated fishing in Maritime Protected Areas, location-anchored games and a lot more. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://astral-protocol.gitbook.io/astral/archive/universal-location-proofs.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.