Proof of Inference is a challenge-response protocol where the server issues a unique challenge (random nonce + scenario prompt) and the client must run real inference, sign the response with the machine's Ed25519 key, and return it within a plausible time window.

You cannot pre-compute responses because the nonce is random. You cannot replay old results because each challenge is unique. You cannot fake timing because the server validates that response latency is plausible for the claimed hardware profile. You cannot forge signatures because the private key never leaves the machine.

Benchmarks are only useful if you can trust them. Proof of Inference is what makes Forge Matrix data credible — every submission is independently verifiable. This is the cryptographic foundation that makes Forge audit certifications trustworthy. Learn more about enterprise audits.