Zuckerberg
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Every PIA API response includes a trailing RSA-SHA256 signature (line 1 = JSON, lines 3+ = base64-encoded signature) which was previously ignored entirely. Add verifyPIAResponse() that checks each response against PIA's public signing key before trusting the data. On verification failure the service aborts and systemd restarts it. Also bump RestartSec to 5m to avoid hammering PIA servers on repeated failures.