Pick the GPU a provider bills for and the cheaper card it secretly runs; the network measures the real device's compute, bandwidth and VRAM and plots it against the claimed model's fingerprint. Watch the spoof land outside the tolerance band — or hide inside it.
A decentralized GPU network has to answer two questions an AWS invoice never raises: is this the GPU it claims, and did it actually do the work? io.net logged 327,000 registered GPUs and roughly 6,720 daily-verified. We dissect metadata trust, PoW puzzles, performance fingerprinting, and zkGPU-ID.