before-after
Cryptographic proof for field service photo verification
2 followers
Cryptographic proof for field service photo verification
2 followers
Before/After is a mobile app that generates cryptographically signed, GPS-stamped, RFC 3161-timestamped before/after photo proof for field workers. Any edit instantly invalidates the signature. Clients verify locally - zero backend trust required. Every proof includes Ed25519 signature, SHA-256 hash, external timestamp, and GPS accuracy to the meter. Exports as JSON, PDF, or Legal format. Full IP transfer available.
