Fingerprint the exact GPU you're running on, even among identical GPUs, from the order its atomic adds land in. 99.1% accuracy, survives reboots, can't be faked, and a default torch.index_add_ call leaks it.
Home Assistant app: a local network scanner that finds, recognizes and explains every device on your LAN (name, brand, model, presence, latency). No cloud, no accounts.