Finecam Registration Code -

// 1) Decode base64 segment that contains the digital signature // 2) Use the embedded public key (RSA 2048 or ECDSA P‑256) to verify // 3) Constant‑time comparison to avoid timing attacks

// 1. Public API -------------------------------------------------------------- public RegistrationResult Register(string userInput) finecam registration code

private bool VerifySignature(string key) // 1) Decode base64 segment that contains the

// e) Check expiration / feature flags if (payload.IsExpired) return RegistrationResult.Expired; if (!IsFeatureAllowed(payload)) return RegistrationResult.NotAuthorized; finecam registration code

return RegistrationResult.Success;