Sikorka – Ethereum Meets the Outdoors
summary
Sikorka deploys Ethereum contracts tied to GPS coordinates and verifies users with a proof-of-presence workflow: integer lat/long in Solidity, a challenge question whose keccak hash and distance check live in a modifier, and optional QR/RFID/Bluetooth or video checks. Prototype mobile app shows a deployed coffee discount token that mints 100 tokens on a successful claim; demo works end-to-end on mainnet test deployment. Planned work: light client integration, better presence detectors, and wallet/identity hookup.
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