A Distributed Approach to Privacy-Preserving Location Verification Using Blockchain and zk-SNARKs

Imagine a system where individuals or devices can prove their location at a specific time without revealing sensitive details like exact GPS coordinates or personal identifiers. This paper presents a revolutionary multi-signal proof-of-location (PoL) system that combines GPS, Wi-Fi signal strength (RSSI), and Bluetooth proximity with zeroknowledge proofs (ZKPs) to create tamper-proof, privacypreserving location attestations. By leveraging blockchain technology for decentralized validation and record-keeping, the system transcends the limitations of centralized location services and single-signal approaches like GPS, addressing key challenges such as spoofing, tampering, and lack of indoor accuracy. This work has far-reaching implications for industries like logistics, access control, gaming, and metaverse integration.