PRIVACY-PRESERVING LOCATION VERIFICATION SYSTEM AND METHOD

原文（中国語）

A privacy-preserving location verification system computes distance to venue coordinates locally on a user device, maps the distance to discrete proximity categories comprising at least three categories, and generates a coordinate-free digitally signed attestation containing only category information without coordinates, distances, or any encrypted, hashed, obfuscated, or otherwise reversible representation of geographic coordinates. A verification server validates the signature and derives proximity trust solely from the category, being unable to reconstruct coordinates due to the many-to-one mapping where multiple distinct locations produce identical attestations. The system never transmits coordinates in any form. Embodiments include trusted execution environment isolation, multi-modal positioning, zero-knowledge proofs, and differential privacy.