Developer Builds Blockchain Tool to Verify Dog Walks Using GPS Hashing on Solana

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A developer created 'Proof of Walk,' an app that cryptographically verifies dog walking routes using Solana's devnet blockchain. The walker's phone records a GPS route, which is hashed in the browser and committed as a signed attestation on-chain, while the raw location data never leaves the device. Pet owners can later verify the walk by comparing a locally recomputed hash against the on-chain record, making route tampering detectable. Even shifting a single GPS coordinate by roughly 11 metres produces a completely different hash, instantly flagging any alteration. The developer acknowledges the tool narrows but does not eliminate the trust gap, as it proves a device recorded a route rather than confirming a dog was actually present.

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